add initial unittest framework (tests)
move some previous unittests out of core classes and into tests



git-svn-id: http://skia.googlecode.com/svn/trunk@96 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkMath.h b/include/core/SkMath.h
index 5c2b475..683a1ac 100644
--- a/include/core/SkMath.h
+++ b/include/core/SkMath.h
@@ -217,14 +217,5 @@
     return (prod + (prod >> shift)) >> shift;
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
-#ifdef SK_DEBUG
-    class SkMath {
-    public:
-        static void UnitTest();
-    };
-#endif
-
 #endif
 
diff --git a/include/core/SkMatrix.h b/include/core/SkMatrix.h
index 2b25dca..aa008cb 100644
--- a/include/core/SkMatrix.h
+++ b/include/core/SkMatrix.h
@@ -403,13 +403,6 @@
     void dump() const;
     void toDumpString(SkString*) const;
 
-#ifdef SK_DEBUG
-  /** @cond UNIT_TEST */
-
-    static void UnitTest();
-  /** @endcond */
-#endif
-
 private:
     enum {
         /** Set if the matrix will map a rectangle to another rectangle. This
diff --git a/include/core/SkUserConfig.h b/include/core/SkUserConfig.h
index a3c34a3..498eb8f 100644
--- a/include/core/SkUserConfig.h
+++ b/include/core/SkUserConfig.h
@@ -118,7 +118,7 @@
     so this flag is optional.
  */
 #ifdef SK_DEBUG
-//#define SK_SUPPORT_UNITTEST
+#define SK_SUPPORT_UNITTEST
 #endif
 
 #endif
diff --git a/include/core/SkUtils.h b/include/core/SkUtils.h
index f3e3341..9f3b1d6 100644
--- a/include/core/SkUtils.h
+++ b/include/core/SkUtils.h
@@ -96,13 +96,6 @@
 size_t SkUTF16_ToUTF8(const uint16_t utf16[], int numberOf16BitValues,
                            char utf8[] = NULL);
 
-class SkUtils {
-public:
-#ifdef SK_DEBUG
-    static void UnitTest();
-#endif
-};
-
 ///////////////////////////////////////////////////////////////////////////////
 
 class SkAutoTrace {
diff --git a/samplecode/SampleTextOnPath.cpp b/samplecode/SampleTextOnPath.cpp
index 97b4e8e..aec8fd6 100644
--- a/samplecode/SampleTextOnPath.cpp
+++ b/samplecode/SampleTextOnPath.cpp
@@ -304,137 +304,9 @@
     typedef SkView INHERITED;
 };
 
-static const uint16_t gTest0[] = { 0, 0, 1, 1 };
-static const uint16_t gTest1[] = { 1, 2, 3, 4, 5, 6 };
-static const uint16_t gTest2[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
-static const uint16_t gTest3[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
-
-#include "SkRandom.h"
-static SkRandom gRand;
-static void rand_fill(uint16_t buffer[], int count) {
-    for (int i = 0; i < count; i++)
-        buffer[i] = (uint16_t)gRand.nextU();
-}
-
-static void test_pack16() {
-    static const struct {
-        const uint16_t* fSrc;
-        int             fCount;
-    } gTests[] = {
-        { gTest0, SK_ARRAY_COUNT(gTest0) },
-        { gTest1, SK_ARRAY_COUNT(gTest1) },
-        { gTest2, SK_ARRAY_COUNT(gTest2) },
-        { gTest3, SK_ARRAY_COUNT(gTest3) }
-    };
-    
-    for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); i++) {
-        uint8_t dst[100];
-        size_t dstSize = SkPackBits::Pack16(gTests[i].fSrc,
-                                            gTests[i].fCount, dst);
-        printf("Test[%d] orig size = %d, dst size = %d",
-               i, gTests[i].fCount, (int)dstSize);
-        uint16_t src[100];
-        int srcCount = SkPackBits::Unpack16(dst, dstSize, src);
-        printf(", src size = %d", srcCount);
-        bool match = gTests[i].fCount == srcCount && memcmp(gTests[i].fSrc, src,
-                                    gTests[i].fCount * sizeof(uint16_t)) == 0;
-        printf(", match = %d\n", match);
-    }
-    
-    for (int n = 1000; n; n--) {
-        size_t size = 50;
-        uint16_t src[100], src2[100];
-        uint8_t dst[200];
-        rand_fill(src, size);
-
-        size_t dstSize = SkPackBits::Pack16(src, size, dst);
-        size_t maxSize = SkPackBits::ComputeMaxSize16(size);
-        SkASSERT(maxSize >= dstSize);
-
-        int srcCount = SkPackBits::Unpack16(dst, dstSize, src2);
-        SkASSERT(size == srcCount);
-        bool match = memcmp(src, src2, size * sizeof(uint16_t)) == 0;
-        SkASSERT(match);
-    }
-}
-
-static const uint8_t gTest80[] = { 0, 0, 1, 1 };
-static const uint8_t gTest81[] = { 1, 2, 3, 4, 5, 6 };
-static const uint8_t gTest82[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
-static const uint8_t gTest83[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
-static const uint8_t gTest84[] = { 1, 0, 3, 0, 0, 0, 2, 1, 1, 2 };
-
-static void rand_fill(uint8_t buffer[], int count) {
-    for (int i = 0; i < count; i++)
-        buffer[i] = (uint8_t)((gRand.nextU() >> 8) & 0x3);
-}
-
-static void test_pack8() {
-    static const struct {
-        const uint8_t* fSrc;
-        int             fCount;
-    } gTests[] = {
-        { gTest80, SK_ARRAY_COUNT(gTest80) },
-        { gTest81, SK_ARRAY_COUNT(gTest81) },
-        { gTest82, SK_ARRAY_COUNT(gTest82) },
-        { gTest83, SK_ARRAY_COUNT(gTest83) },
-        { gTest84, SK_ARRAY_COUNT(gTest84) }
-    };
-    
-    for (size_t i = 4; i < SK_ARRAY_COUNT(gTests); i++) {
-        uint8_t dst[100];
-        size_t maxSize = SkPackBits::ComputeMaxSize8(gTests[i].fCount);
-        size_t dstSize = SkPackBits::Pack8(gTests[i].fSrc,
-                                           gTests[i].fCount, dst);
-        SkASSERT(dstSize <= maxSize);
-        printf("Test[%d] orig size = %d, dst size = %d", i,
-               gTests[i].fCount, (int)dstSize);
-        uint8_t src[100];
-        int srcCount = SkPackBits::Unpack8(dst, dstSize, src);
-        printf(", src size = %d", srcCount);
-        bool match = gTests[i].fCount == srcCount &&
-                    memcmp(gTests[i].fSrc, src,
-                           gTests[i].fCount * sizeof(uint8_t)) == 0;
-        printf(", match = %d\n", match);
-    }
-
-    for (size_t size = 1; size <= 512; size += 1) {
-        for (int n = 200; n; n--) {
-            uint8_t src[600], src2[600];
-            uint8_t dst[600];
-            rand_fill(src, size);
-
-            size_t dstSize = SkPackBits::Pack8(src, size, dst);
-            size_t maxSize = SkPackBits::ComputeMaxSize8(size);
-            SkASSERT(maxSize >= dstSize);
-
-            int srcCount = SkPackBits::Unpack8(dst, dstSize, src2);
-            SkASSERT(size == srcCount);
-            bool match = memcmp(src, src2, size * sizeof(uint8_t)) == 0;
-            SkASSERT(match);
-            
-            for (int j = 0; j < 200; j++) {
-                size_t skip = gRand.nextU() % size;
-                size_t write = gRand.nextU() % size;
-                if (skip + write > size) {
-                    write = size - skip;
-                }
-                SkPackBits::Unpack8(src, skip, write, dst);
-                bool match = memcmp(src, src2 + skip, write) == 0;
-                SkASSERT(match);
-            }
-        }
-    }
-}
-
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() {
-    static bool gOnce;
-    if (!gOnce) {
-//        test_pack8();
-        gOnce = true;
-    }
     return new TextOnPathView;
 }
 
diff --git a/src/core/SkGraphics.cpp b/src/core/SkGraphics.cpp
index 7536ca8..053d9f0 100644
--- a/src/core/SkGraphics.cpp
+++ b/src/core/SkGraphics.cpp
@@ -345,10 +345,7 @@
         void (*fUnitTest)();
     } gUnitTests[] = {
         unittestline(Sk64),
-        unittestline(SkMath),
-        unittestline(SkUtils),
         unittestline(SkString),
-        unittestline(SkMatrix),
         unittestline(SkGeometry),
         unittestline(SkPath),
         unittestline(SkPathMeasure),
diff --git a/src/core/SkMath.cpp b/src/core/SkMath.cpp
index e0babeb..649b518 100644
--- a/src/core/SkMath.cpp
+++ b/src/core/SkMath.cpp
@@ -543,396 +543,3 @@
 SkFixed SkFixedExp(SkFixed x) { return SkCordicExp(x); }
 SkFixed SkFixedLog(SkFixed x) { return SkCordicLog(x); }
 
-///////////////////////////////////////////////////////////////////////////////
-///////////////////////////////////////////////////////////////////////////////
-
-#ifdef SK_DEBUG
-
-#include "SkRandom.h"
-
-#if defined(SkLONGLONG) && defined(SK_SUPPORT_UNITTEST)
-static int symmetric_fixmul(int a, int b) {
-    int sa = SkExtractSign(a);
-    int sb = SkExtractSign(b);
-
-    a = SkApplySign(a, sa);
-    b = SkApplySign(b, sb);
-
-#if 1
-    int c = (int)(((SkLONGLONG)a * b) >> 16);
-    
-    return SkApplySign(c, sa ^ sb);
-#else
-    SkLONGLONG ab = (SkLONGLONG)a * b;
-    if (sa ^ sb) {
-        ab = -ab;
-    }
-    return ab >> 16;
-#endif
-}
-#endif
-
-#include "SkPoint.h"
-
-#ifdef SK_SUPPORT_UNITTEST
-static void check_length(const SkPoint& p, SkScalar targetLen) {
-#ifdef SK_CAN_USE_FLOAT
-    float x = SkScalarToFloat(p.fX);
-    float y = SkScalarToFloat(p.fY);
-    float len = sk_float_sqrt(x*x + y*y);
-    
-    len /= SkScalarToFloat(targetLen);
-
-    SkASSERT(len > 0.999f && len < 1.001f);
-#endif
-}
-#endif
-
-#if defined(SK_CAN_USE_FLOAT) && defined(SK_SUPPORT_UNITTEST)
-
-static float nextFloat(SkRandom& rand) {
-    SkFloatIntUnion data;
-    data.fSignBitInt = rand.nextU();
-    return data.fFloat;
-}
-
-/*  returns true if a == b as resulting from (int)x. Since it is undefined
-    what to do if the float exceeds 2^32-1, we check for that explicitly.
-*/
-static bool equal_float_native_skia(float x, uint32_t ni, uint32_t si) {
-    if (!(x == x)) {    // NAN
-        return si == SK_MaxS32 || si == SK_MinS32;
-    }
-    // for out of range, C is undefined, but skia always should return NaN32
-    if (x > SK_MaxS32) {
-        return si == SK_MaxS32;
-    }
-    if (x < -SK_MaxS32) {
-        return si == SK_MinS32;
-    }
-    return si == ni;
-}
-
-static void assert_float_equal(const char op[], float x, uint32_t ni,
-                               uint32_t si) {
-    if (!equal_float_native_skia(x, ni, si)) {
-        SkDebugf("-- %s float %g bits %x native %x skia %x\n", op, x, ni, si);
-        SkASSERT(!"oops");
-    }
-}
-
-static void test_float_cast(float x) {
-    int ix = (int)x;
-    int iix = SkFloatToIntCast(x);
-    assert_float_equal("cast", x, ix, iix);
-}
-
-static void test_float_floor(float x) {
-    int ix = (int)floor(x);
-    int iix = SkFloatToIntFloor(x);
-    assert_float_equal("floor", x, ix, iix);
-}
-
-static void test_float_round(float x) {
-    double xx = x + 0.5;    // need intermediate double to avoid temp loss
-    int ix = (int)floor(xx);
-    int iix = SkFloatToIntRound(x);
-    assert_float_equal("round", x, ix, iix);
-}
-
-static void test_float_ceil(float x) {
-    int ix = (int)ceil(x);
-    int iix = SkFloatToIntCeil(x);
-    assert_float_equal("ceil", x, ix, iix);
-}
-
-static void test_float_conversions(float x) {
-    test_float_cast(x);
-    test_float_floor(x);
-    test_float_round(x);
-    test_float_ceil(x);
-}
-
-static void test_int2float(int ival) {
-    float x0 = (float)ival;
-    float x1 = SkIntToFloatCast(ival);
-    float x2 = SkIntToFloatCast_NoOverflowCheck(ival);
-    SkASSERT(x0 == x1);
-    SkASSERT(x0 == x2);
-}
-
-static void unittest_fastfloat() {
-    SkRandom rand;
-    size_t i;
-
-    static const float gFloats[] = {
-        0.f, 1.f, 0.5f, 0.499999f, 0.5000001f, 1.f/3,
-        0.000000001f, 1000000000.f,     // doesn't overflow
-        0.0000000001f, 10000000000.f    // does overflow
-    };
-    for (i = 0; i < SK_ARRAY_COUNT(gFloats); i++) {
-//        SkDebugf("---- test floats %g %d\n", gFloats[i], (int)gFloats[i]);
-        test_float_conversions(gFloats[i]);
-        test_float_conversions(-gFloats[i]);
-    }
-    
-    for (int outer = 0; outer < 100; outer++) {
-        rand.setSeed(outer);
-        for (i = 0; i < 100000; i++) {
-            float x = nextFloat(rand);
-            test_float_conversions(x);
-        }
-        
-        test_int2float(0);
-        test_int2float(1);
-        test_int2float(-1);
-        for (i = 0; i < 100000; i++) {
-            // for now only test ints that are 24bits or less, since we don't
-            // round (down) large ints the same as IEEE...
-            int ival = rand.nextU() & 0xFFFFFF;
-            test_int2float(ival);
-            test_int2float(-ival);
-        }
-    }
-}
-
-#endif
-
-#ifdef SK_SUPPORT_UNITTEST
-static void test_muldiv255() {
-#ifdef SK_CAN_USE_FLOAT
-    for (int a = 0; a <= 255; a++) {
-        for (int b = 0; b <= 255; b++) {
-            int ab = a * b;
-            float s = ab / 255.0f;
-            int round = (int)floorf(s + 0.5f);
-            int trunc = (int)floorf(s);
-            
-            int iround = SkMulDiv255Round(a, b);
-            int itrunc = SkMulDiv255Trunc(a, b);
-            
-            SkASSERT(iround == round);
-            SkASSERT(itrunc == trunc);
-            
-            SkASSERT(itrunc <= iround);
-            SkASSERT(iround <= a);
-            SkASSERT(iround <= b);
-        }
-    }
-#endif
-}
-#endif
-
-void SkMath::UnitTest() {    
-#ifdef SK_SUPPORT_UNITTEST
-    int         i;
-    int32_t     x;
-    SkRandom    rand;
-
-    SkToS8(127);    SkToS8(-128);       SkToU8(255);
-    SkToS16(32767); SkToS16(-32768);    SkToU16(65535);
-    SkToS32(2*1024*1024);   SkToS32(-2*1024*1024);  SkToU32(4*1024*1024);
-
-    SkCordic_UnitTest();
-
-    // these should assert
-#if 0
-    SkToS8(128);
-    SkToS8(-129);
-    SkToU8(256);
-    SkToU8(-5);
-
-    SkToS16(32768);
-    SkToS16(-32769);
-    SkToU16(65536);
-    SkToU16(-5);
-
-    if (sizeof(size_t) > 4) {
-        SkToS32(4*1024*1024);
-        SkToS32(-4*1024*1024);
-        SkToU32(5*1024*1024);
-        SkToU32(-5);
-    }
-#endif
-
-    test_muldiv255();
-
-#ifdef SK_DEBUG
-    {
-        SkScalar x = SK_ScalarNaN;
-        SkASSERT(SkScalarIsNaN(x));
-    }
-#endif
-
-    for (i = 1; i <= 10; i++) {
-        x = SkCubeRootBits(i*i*i, 11);
-        SkASSERT(x == i);
-    }
-
-    x = SkFixedSqrt(SK_Fixed1);
-    SkASSERT(x == SK_Fixed1);
-    x = SkFixedSqrt(SK_Fixed1/4);
-    SkASSERT(x == SK_Fixed1/2);
-    x = SkFixedSqrt(SK_Fixed1*4);
-    SkASSERT(x == SK_Fixed1*2);
-
-    x = SkFractSqrt(SK_Fract1);
-    SkASSERT(x == SK_Fract1);
-    x = SkFractSqrt(SK_Fract1/4);
-    SkASSERT(x == SK_Fract1/2);
-    x = SkFractSqrt(SK_Fract1/16);
-    SkASSERT(x == SK_Fract1/4);
-
-    for (i = 1; i < 100; i++) {
-        x = SkFixedSqrt(SK_Fixed1 * i * i);
-        SkASSERT(x == SK_Fixed1 * i);
-    }
-
-    for (i = 0; i < 1000; i++) {
-        int value = rand.nextS16();
-        int max = rand.nextU16();
-
-        int clamp = SkClampMax(value, max);
-        int clamp2 = value < 0 ? 0 : (value > max ? max : value);
-        SkASSERT(clamp == clamp2);
-    }
-    
-    for (i = 0; i < 100000; i++) {
-        SkPoint p;
-        
-        p.setLength(rand.nextS(), rand.nextS(), SK_Scalar1);
-        check_length(p, SK_Scalar1);
-        p.setLength(rand.nextS() >> 13, rand.nextS() >> 13, SK_Scalar1);
-        check_length(p, SK_Scalar1);
-    }
-
-    {
-        SkFixed result = SkFixedDiv(100, 100);
-        SkASSERT(result == SK_Fixed1);
-        result = SkFixedDiv(1, SK_Fixed1);
-        SkASSERT(result == 1);
-    }
-    
-#ifdef SK_CAN_USE_FLOAT
-    unittest_fastfloat();
-#endif
-    
-#ifdef SkLONGLONG
-    for (i = 0; i < 100000; i++) {
-        SkFixed numer = rand.nextS();
-        SkFixed denom = rand.nextS();
-        SkFixed result = SkFixedDiv(numer, denom);
-        SkLONGLONG check = ((SkLONGLONG)numer << 16) / denom;
-
-        (void)SkCLZ(numer);
-        (void)SkCLZ(denom);
-
-        SkASSERT(result != (SkFixed)SK_NaN32);
-        if (check > SK_MaxS32) {
-            check = SK_MaxS32;
-        } else if (check < -SK_MaxS32) {
-            check = SK_MinS32;
-        }
-        SkASSERT(result == (int32_t)check);
-
-        result = SkFractDiv(numer, denom);
-        check = ((SkLONGLONG)numer << 30) / denom;
-
-        SkASSERT(result != (SkFixed)SK_NaN32);
-        if (check > SK_MaxS32) {
-            check = SK_MaxS32;
-        } else if (check < -SK_MaxS32) {
-            check = SK_MinS32;
-        }
-        SkASSERT(result == (int32_t)check);
-
-        // make them <= 2^24, so we don't overflow in fixmul
-        numer = numer << 8 >> 8;
-        denom = denom << 8 >> 8;
-
-        result = SkFixedMul(numer, denom);
-        SkFixed r2 = symmetric_fixmul(numer, denom);
-//        SkASSERT(result == r2);
-
-        result = SkFixedMul(numer, numer);
-        r2 = SkFixedSquare(numer);
-        SkASSERT(result == r2);
-        
-#ifdef SK_CAN_USE_FLOAT
-        if (numer >= 0 && denom >= 0) {
-            SkFixed mean = SkFixedMean(numer, denom);
-            float fm = sk_float_sqrt(sk_float_abs(SkFixedToFloat(numer) * SkFixedToFloat(denom)));
-            SkFixed mean2 = SkFloatToFixed(fm);
-            int diff = SkAbs32(mean - mean2);
-            SkASSERT(diff <= 1);
-        }
-
-        {
-            SkFixed mod = SkFixedMod(numer, denom);
-            float n = SkFixedToFloat(numer);
-            float d = SkFixedToFloat(denom);
-            float m = sk_float_mod(n, d);
-#if 0
-            SkDebugf("%g mod %g = %g [%g]\n",
-                    SkFixedToFloat(numer), SkFixedToFloat(denom),
-                    SkFixedToFloat(mod), m);
-#endif
-            SkASSERT(mod == 0 || (mod < 0) == (m < 0)); // ensure the same sign
-            int diff = SkAbs32(mod - SkFloatToFixed(m));
-            SkASSERT((diff >> 7) == 0);
-        }
-#endif
-    }
-#endif
-
-#ifdef SK_CAN_USE_FLOAT
-    for (i = 0; i < 100000; i++) {
-        SkFract x = rand.nextU() >> 1;
-        double xx = (double)x / SK_Fract1;
-        SkFract xr = SkFractSqrt(x);
-        SkFract check = SkFloatToFract(sqrt(xx));
-        SkASSERT(xr == check || xr == check-1 || xr == check+1);
-
-        xr = SkFixedSqrt(x);
-        xx = (double)x / SK_Fixed1;
-        check = SkFloatToFixed(sqrt(xx));
-        SkASSERT(xr == check || xr == check-1);
-
-        xr = SkSqrt32(x);
-        xx = (double)x;
-        check = (int32_t)sqrt(xx);
-        SkASSERT(xr == check || xr == check-1);
-    }
-#endif
-
-#if !defined(SK_SCALAR_IS_FLOAT) && defined(SK_CAN_USE_FLOAT)
-    {
-        SkFixed s, c;
-        s = SkFixedSinCos(0, &c);
-        SkASSERT(s == 0);
-        SkASSERT(c == SK_Fixed1);
-    }
-
-    int maxDiff = 0;
-    for (i = 0; i < 10000; i++) {
-        SkFixed rads = rand.nextS() >> 10;
-        double frads = SkFixedToFloat(rads);
-
-        SkFixed s, c;
-        s = SkScalarSinCos(rads, &c);
-
-        double fs = sin(frads);
-        double fc = cos(frads);
-
-        SkFixed is = SkFloatToFixed(fs);
-        SkFixed ic = SkFloatToFixed(fc);
-
-        maxDiff = SkMax32(maxDiff, SkAbs32(is - s));
-        maxDiff = SkMax32(maxDiff, SkAbs32(ic - c));
-    }
-    SkDebugf("SinCos: maximum error = %d\n", maxDiff);
-#endif
-#endif
-}
-
-#endif
diff --git a/src/core/SkMatrix.cpp b/src/core/SkMatrix.cpp
index 893aea1..ac5ae92 100644
--- a/src/core/SkMatrix.cpp
+++ b/src/core/SkMatrix.cpp
@@ -1606,85 +1606,3 @@
 #endif
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
-#ifdef SK_DEBUG
-
-void SkMatrix::UnitTest() {
-#ifdef SK_SUPPORT_UNITTEST
-    SkMatrix    mat, inverse, iden1, iden2;
-
-    mat.reset();
-    mat.setTranslate(SK_Scalar1, SK_Scalar1);
-    mat.invert(&inverse);
-    inverse.dump();
-    iden1.setConcat(mat, inverse);
-    iden1.dump();
-
-    mat.setScale(SkIntToScalar(2), SkIntToScalar(2));
-    mat.invert(&inverse);
-    inverse.dump();
-    iden1.setConcat(mat, inverse);
-    iden1.dump();
-
-    mat.setScale(SK_Scalar1/2, SK_Scalar1/2);
-    mat.invert(&inverse);
-    inverse.dump();
-    iden1.setConcat(mat, inverse);
-    iden1.dump();
-    SkASSERT(iden1.isIdentity());
-
-    mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0);
-    mat.postRotate(SkIntToScalar(25));
-
-    SkASSERT(mat.invert(NULL));
-    mat.invert(&inverse);
-
-    iden1.setConcat(mat, inverse);
-    iden2.setConcat(inverse, mat);
-
-    iden1.dump();
-//    SkASSERT(iden1.isIdentity());
-    iden2.dump();
-//    SkASSERT(iden2.isIdentity());
-    
-    // rectStaysRect test
-    {
-        static const struct {
-            SkScalar    m00, m01, m10, m11;
-            bool        mStaysRect;
-        }
-        gRectStaysRectSamples[] = {
-            {          0,          0,          0,           0, false },
-            {          0,          0,          0,  SK_Scalar1, false },
-            {          0,          0, SK_Scalar1,           0, false },
-            {          0,          0, SK_Scalar1,  SK_Scalar1, false },
-            {          0, SK_Scalar1,          0,           0, false },
-            {          0, SK_Scalar1,          0,  SK_Scalar1, false },
-            {          0, SK_Scalar1, SK_Scalar1,           0, true },
-            {          0, SK_Scalar1, SK_Scalar1,  SK_Scalar1, false },
-            { SK_Scalar1,          0,          0,           0, false },
-            { SK_Scalar1,          0,          0,  SK_Scalar1, true },
-            { SK_Scalar1,          0, SK_Scalar1,           0, false },
-            { SK_Scalar1,          0, SK_Scalar1,  SK_Scalar1, false },
-            { SK_Scalar1, SK_Scalar1,          0,           0, false },
-            { SK_Scalar1, SK_Scalar1,          0,  SK_Scalar1, false },
-            { SK_Scalar1, SK_Scalar1, SK_Scalar1,           0, false },
-            { SK_Scalar1, SK_Scalar1, SK_Scalar1,  SK_Scalar1, false }
-        };
-        
-        for (size_t i = 0; i < SK_ARRAY_COUNT(gRectStaysRectSamples); i++) {
-            SkMatrix    m;
-            
-            m.reset();
-            m.set(SkMatrix::kMScaleX, gRectStaysRectSamples[i].m00);
-            m.set(SkMatrix::kMSkewX,  gRectStaysRectSamples[i].m01);
-            m.set(SkMatrix::kMSkewY,  gRectStaysRectSamples[i].m10);
-            m.set(SkMatrix::kMScaleY, gRectStaysRectSamples[i].m11);
-            SkASSERT(m.rectStaysRect() == gRectStaysRectSamples[i].mStaysRect);
-        }
-    }
-#endif
-}
-
-#endif
diff --git a/src/core/SkUtils.cpp b/src/core/SkUtils.cpp
index a4c6c16..edc5b74 100644
--- a/src/core/SkUtils.cpp
+++ b/src/core/SkUtils.cpp
@@ -458,126 +458,3 @@
 #endif
 }
 
-////////////////////////////////////////////////////////////////////////////////////
-
-#ifdef SK_DEBUG
-
-#include "SkRandom.h"
-#include "SkTSearch.h"
-#include "SkTSort.h"
-
-#define kSEARCH_COUNT   91
-
-#ifdef SK_SUPPORT_UNITTEST
-static void test_search()
-{
-    int         i, array[kSEARCH_COUNT];
-    SkRandom    rand;
-
-    for (i = 0; i < kSEARCH_COUNT; i++)
-        array[i] = rand.nextS();
-
-    SkTHeapSort<int>(array, kSEARCH_COUNT);
-    // make sure we got sorted properly
-    for (i = 1; i < kSEARCH_COUNT; i++)
-        SkASSERT(array[i-1] <= array[i]);
-
-    // make sure we can find all of our values
-    for (i = 0; i < kSEARCH_COUNT; i++)
-    {
-        int index = SkTSearch<int>(array, kSEARCH_COUNT, array[i], sizeof(int));
-        SkASSERT(index == i);
-    }
-
-    // make sure that random values are either found, or the correct
-    // insertion index is returned
-    for (i = 0; i < 10000; i++)
-    {
-        int value = rand.nextS();
-        int index = SkTSearch<int>(array, kSEARCH_COUNT, value, sizeof(int));
-
-        if (index >= 0)
-            SkASSERT(index < kSEARCH_COUNT && array[index] == value);
-        else
-        {
-            index = ~index;
-            SkASSERT(index <= kSEARCH_COUNT);
-            if (index < kSEARCH_COUNT)
-            {
-                SkASSERT(value < array[index]);
-                if (index > 0)
-                    SkASSERT(value > array[index - 1]);
-            }
-            else    // we should append the new value
-            {
-                SkASSERT(value > array[kSEARCH_COUNT - 1]);
-            }
-        }
-    }
-}
-
-static void test_utf16()
-{
-    static const SkUnichar gUni[] = {
-        0x10000, 0x18080, 0x20202, 0xFFFFF, 0x101234
-    };
-    
-    uint16_t buf[2];
-    
-    for (unsigned i = 0; i < SK_ARRAY_COUNT(gUni); i++)
-    {
-        size_t count = SkUTF16_FromUnichar(gUni[i], buf);
-        SkASSERT(count == 2);
-        size_t count2 = SkUTF16_CountUnichars(buf, 2);
-        SkASSERT(count2 == 1);
-        const uint16_t* ptr = buf;
-        SkUnichar c = SkUTF16_NextUnichar(&ptr);
-        SkASSERT(c == gUni[i]);
-        SkASSERT(ptr - buf == 2);
-    }
-}
-
-#endif
-
-void SkUtils::UnitTest()
-{
-#ifdef SK_SUPPORT_UNITTEST
-    static const struct {
-        const char* fUtf8;
-        SkUnichar   fUni;
-    } gTest[] = {
-        { "a",                  'a' },
-        { "\x7f",               0x7f },
-        { "\xC2\x80",           0x80 },
-        { "\xC3\x83",           (3 << 6) | 3    },
-        { "\xDF\xBF",           0x7ff },
-        { "\xE0\xA0\x80",       0x800 },
-        { "\xE0\xB0\xB8",       0xC38 },
-        { "\xE3\x83\x83",       (3 << 12) | (3 << 6) | 3    },
-        { "\xEF\xBF\xBF",       0xFFFF },
-        { "\xF0\x90\x80\x80",   0x10000 },
-        { "\xF3\x83\x83\x83",   (3 << 18) | (3 << 12) | (3 << 6) | 3    }
-    };
-
-    for (unsigned i = 0; i < SK_ARRAY_COUNT(gTest); i++)
-    {
-        const char* p = gTest[i].fUtf8;
-        int         n = SkUTF8_CountUnichars(p);
-        SkUnichar   u0 = SkUTF8_ToUnichar(gTest[i].fUtf8);
-        SkUnichar   u1 = SkUTF8_NextUnichar(&p);
-
-        SkASSERT(n == 1);
-        SkASSERT(u0 == u1);
-        SkASSERT(u0 == gTest[i].fUni);
-        SkASSERT(p - gTest[i].fUtf8 == (int)strlen(gTest[i].fUtf8));
-    }
-    
-    test_utf16();
-
-    test_search();
-#endif
-}
-
-#endif
-
-
diff --git a/tests/MathTest.cpp b/tests/MathTest.cpp
new file mode 100644
index 0000000..a759ab1
--- /dev/null
+++ b/tests/MathTest.cpp
@@ -0,0 +1,400 @@
+#include "Test.h"
+#include "SkPoint.h"
+#include "SkRandom.h"
+
+#if defined(SkLONGLONG)
+static int symmetric_fixmul(int a, int b) {
+    int sa = SkExtractSign(a);
+    int sb = SkExtractSign(b);
+    
+    a = SkApplySign(a, sa);
+    b = SkApplySign(b, sb);
+    
+#if 1
+    int c = (int)(((SkLONGLONG)a * b) >> 16);
+    
+    return SkApplySign(c, sa ^ sb);
+#else
+    SkLONGLONG ab = (SkLONGLONG)a * b;
+    if (sa ^ sb) {
+        ab = -ab;
+    }
+    return ab >> 16;
+#endif
+}
+#endif
+
+static void check_length(skiatest::Reporter* reporter,
+                         const SkPoint& p, SkScalar targetLen) {
+#ifdef SK_CAN_USE_FLOAT
+    float x = SkScalarToFloat(p.fX);
+    float y = SkScalarToFloat(p.fY);
+    float len = sk_float_sqrt(x*x + y*y);
+    
+    len /= SkScalarToFloat(targetLen);
+    
+    REPORTER_ASSERT(reporter, len > 0.999f && len < 1.001f);
+#endif
+}
+
+#if defined(SK_CAN_USE_FLOAT)
+
+static float nextFloat(SkRandom& rand) {
+    SkFloatIntUnion data;
+    data.fSignBitInt = rand.nextU();
+    return data.fFloat;
+}
+
+/*  returns true if a == b as resulting from (int)x. Since it is undefined
+ what to do if the float exceeds 2^32-1, we check for that explicitly.
+ */
+static bool equal_float_native_skia(float x, uint32_t ni, uint32_t si) {
+    if (!(x == x)) {    // NAN
+        return si == SK_MaxS32 || si == SK_MinS32;
+    }
+    // for out of range, C is undefined, but skia always should return NaN32
+    if (x > SK_MaxS32) {
+        return si == SK_MaxS32;
+    }
+    if (x < -SK_MaxS32) {
+        return si == SK_MinS32;
+    }
+    return si == ni;
+}
+
+static void assert_float_equal(skiatest::Reporter* reporter, const char op[],
+                               float x, uint32_t ni, uint32_t si) {
+    if (!equal_float_native_skia(x, ni, si)) {
+        SkString desc;
+        desc.printf("%s float %g bits %x native %x skia %x\n", op, x, ni, si);
+        reporter->reportFailed(desc);
+    }
+}
+
+static void test_float_cast(skiatest::Reporter* reporter, float x) {
+    int ix = (int)x;
+    int iix = SkFloatToIntCast(x);
+    assert_float_equal(reporter, "cast", x, ix, iix);
+}
+
+static void test_float_floor(skiatest::Reporter* reporter, float x) {
+    int ix = (int)floor(x);
+    int iix = SkFloatToIntFloor(x);
+    assert_float_equal(reporter, "floor", x, ix, iix);
+}
+
+static void test_float_round(skiatest::Reporter* reporter, float x) {
+    double xx = x + 0.5;    // need intermediate double to avoid temp loss
+    int ix = (int)floor(xx);
+    int iix = SkFloatToIntRound(x);
+    assert_float_equal(reporter, "round", x, ix, iix);
+}
+
+static void test_float_ceil(skiatest::Reporter* reporter, float x) {
+    int ix = (int)ceil(x);
+    int iix = SkFloatToIntCeil(x);
+    assert_float_equal(reporter, "ceil", x, ix, iix);
+}
+
+static void test_float_conversions(skiatest::Reporter* reporter, float x) {
+    test_float_cast(reporter, x);
+    test_float_floor(reporter, x);
+    test_float_round(reporter, x);
+    test_float_ceil(reporter, x);
+}
+
+static void test_int2float(skiatest::Reporter* reporter, int ival) {
+    float x0 = (float)ival;
+    float x1 = SkIntToFloatCast(ival);
+    float x2 = SkIntToFloatCast_NoOverflowCheck(ival);
+    REPORTER_ASSERT(reporter, x0 == x1);
+    REPORTER_ASSERT(reporter, x0 == x2);
+}
+
+static void unittest_fastfloat(skiatest::Reporter* reporter) {
+    SkRandom rand;
+    size_t i;
+    
+    static const float gFloats[] = {
+        0.f, 1.f, 0.5f, 0.499999f, 0.5000001f, 1.f/3,
+        0.000000001f, 1000000000.f,     // doesn't overflow
+        0.0000000001f, 10000000000.f    // does overflow
+    };
+    for (i = 0; i < SK_ARRAY_COUNT(gFloats); i++) {
+        //        SkDebugf("---- test floats %g %d\n", gFloats[i], (int)gFloats[i]);
+        test_float_conversions(reporter, gFloats[i]);
+        test_float_conversions(reporter, -gFloats[i]);
+    }
+    
+    for (int outer = 0; outer < 100; outer++) {
+        rand.setSeed(outer);
+        for (i = 0; i < 100000; i++) {
+            float x = nextFloat(rand);
+            test_float_conversions(reporter, x);
+        }
+        
+        test_int2float(reporter, 0);
+        test_int2float(reporter, 1);
+        test_int2float(reporter, -1);
+        for (i = 0; i < 100000; i++) {
+            // for now only test ints that are 24bits or less, since we don't
+            // round (down) large ints the same as IEEE...
+            int ival = rand.nextU() & 0xFFFFFF;
+            test_int2float(reporter, ival);
+            test_int2float(reporter, -ival);
+        }
+    }
+}
+
+#endif
+
+static void test_muldiv255(skiatest::Reporter* reporter) {
+#ifdef SK_CAN_USE_FLOAT
+    for (int a = 0; a <= 255; a++) {
+        for (int b = 0; b <= 255; b++) {
+            int ab = a * b;
+            float s = ab / 255.0f;
+            int round = (int)floorf(s + 0.5f);
+            int trunc = (int)floorf(s);
+            
+            int iround = SkMulDiv255Round(a, b);
+            int itrunc = SkMulDiv255Trunc(a, b);
+            
+            REPORTER_ASSERT(reporter, iround == round);
+            REPORTER_ASSERT(reporter, itrunc == trunc);
+            
+            REPORTER_ASSERT(reporter, itrunc <= iround);
+            REPORTER_ASSERT(reporter, iround <= a);
+            REPORTER_ASSERT(reporter, iround <= b);
+        }
+    }
+#endif
+}
+
+static void TestMath(skiatest::Reporter* reporter) {    
+    int         i;
+    int32_t     x;
+    SkRandom    rand;
+    
+    // these should not assert
+    SkToS8(127);    SkToS8(-128);       SkToU8(255);
+    SkToS16(32767); SkToS16(-32768);    SkToU16(65535);
+    SkToS32(2*1024*1024);   SkToS32(-2*1024*1024);  SkToU32(4*1024*1024);
+    
+    // these should assert
+#if 0
+    SkToS8(128);
+    SkToS8(-129);
+    SkToU8(256);
+    SkToU8(-5);
+    
+    SkToS16(32768);
+    SkToS16(-32769);
+    SkToU16(65536);
+    SkToU16(-5);
+    
+    if (sizeof(size_t) > 4) {
+        SkToS32(4*1024*1024);
+        SkToS32(-4*1024*1024);
+        SkToU32(5*1024*1024);
+        SkToU32(-5);
+    }
+#endif
+    
+    test_muldiv255(reporter);
+    
+    {
+        SkScalar x = SK_ScalarNaN;
+        REPORTER_ASSERT(reporter, SkScalarIsNaN(x));
+    }
+    
+    for (i = 1; i <= 10; i++) {
+        x = SkCubeRootBits(i*i*i, 11);
+        REPORTER_ASSERT(reporter, x == i);
+    }
+    
+    REPORTER_ASSERT(reporter, !"test the reporter");
+    
+    x = SkFixedSqrt(SK_Fixed1);
+    REPORTER_ASSERT(reporter, x == SK_Fixed1);
+    x = SkFixedSqrt(SK_Fixed1/4);
+    REPORTER_ASSERT(reporter, x == SK_Fixed1/2);
+    x = SkFixedSqrt(SK_Fixed1*4);
+    REPORTER_ASSERT(reporter, x == SK_Fixed1*2);
+    
+    x = SkFractSqrt(SK_Fract1);
+    REPORTER_ASSERT(reporter, x == SK_Fract1);
+    x = SkFractSqrt(SK_Fract1/4);
+    REPORTER_ASSERT(reporter, x == SK_Fract1/2);
+    x = SkFractSqrt(SK_Fract1/16);
+    REPORTER_ASSERT(reporter, x == SK_Fract1/4);
+    
+    for (i = 1; i < 100; i++) {
+        x = SkFixedSqrt(SK_Fixed1 * i * i);
+        REPORTER_ASSERT(reporter, x == SK_Fixed1 * i);
+    }
+    
+    for (i = 0; i < 1000; i++) {
+        int value = rand.nextS16();
+        int max = rand.nextU16();
+        
+        int clamp = SkClampMax(value, max);
+        int clamp2 = value < 0 ? 0 : (value > max ? max : value);
+        REPORTER_ASSERT(reporter, clamp == clamp2);
+    }
+    
+    for (i = 0; i < 100000; i++) {
+        SkPoint p;
+        
+        p.setLength(rand.nextS(), rand.nextS(), SK_Scalar1);
+        check_length(reporter, p, SK_Scalar1);
+        p.setLength(rand.nextS() >> 13, rand.nextS() >> 13, SK_Scalar1);
+        check_length(reporter, p, SK_Scalar1);
+    }
+    
+    {
+        SkFixed result = SkFixedDiv(100, 100);
+        REPORTER_ASSERT(reporter, result == SK_Fixed1);
+        result = SkFixedDiv(1, SK_Fixed1);
+        REPORTER_ASSERT(reporter, result == 1);
+    }
+    
+#ifdef SK_CAN_USE_FLOAT
+    unittest_fastfloat(reporter);
+#endif
+    
+#ifdef SkLONGLONG
+    for (i = 0; i < 100000; i++) {
+        SkFixed numer = rand.nextS();
+        SkFixed denom = rand.nextS();
+        SkFixed result = SkFixedDiv(numer, denom);
+        SkLONGLONG check = ((SkLONGLONG)numer << 16) / denom;
+        
+        (void)SkCLZ(numer);
+        (void)SkCLZ(denom);
+        
+        REPORTER_ASSERT(reporter, result != (SkFixed)SK_NaN32);
+        if (check > SK_MaxS32) {
+            check = SK_MaxS32;
+        } else if (check < -SK_MaxS32) {
+            check = SK_MinS32;
+        }
+        REPORTER_ASSERT(reporter, result == (int32_t)check);
+        
+        result = SkFractDiv(numer, denom);
+        check = ((SkLONGLONG)numer << 30) / denom;
+        
+        REPORTER_ASSERT(reporter, result != (SkFixed)SK_NaN32);
+        if (check > SK_MaxS32) {
+            check = SK_MaxS32;
+        } else if (check < -SK_MaxS32) {
+            check = SK_MinS32;
+        }
+        REPORTER_ASSERT(reporter, result == (int32_t)check);
+        
+        // make them <= 2^24, so we don't overflow in fixmul
+        numer = numer << 8 >> 8;
+        denom = denom << 8 >> 8;
+        
+        result = SkFixedMul(numer, denom);
+        SkFixed r2 = symmetric_fixmul(numer, denom);
+        //        SkASSERT(result == r2);
+        
+        result = SkFixedMul(numer, numer);
+        r2 = SkFixedSquare(numer);
+        REPORTER_ASSERT(reporter, result == r2);
+        
+#ifdef SK_CAN_USE_FLOAT
+        if (numer >= 0 && denom >= 0) {
+            SkFixed mean = SkFixedMean(numer, denom);
+            float fm = sk_float_sqrt(sk_float_abs(SkFixedToFloat(numer) * SkFixedToFloat(denom)));
+            SkFixed mean2 = SkFloatToFixed(fm);
+            int diff = SkAbs32(mean - mean2);
+            REPORTER_ASSERT(reporter, diff <= 1);
+        }
+        
+        {
+            SkFixed mod = SkFixedMod(numer, denom);
+            float n = SkFixedToFloat(numer);
+            float d = SkFixedToFloat(denom);
+            float m = sk_float_mod(n, d);
+            REPORTER_ASSERT(reporter, mod == 0 || (mod < 0) == (m < 0)); // ensure the same sign
+            int diff = SkAbs32(mod - SkFloatToFixed(m));
+            REPORTER_ASSERT(reporter, (diff >> 7) == 0);
+        }
+#endif
+    }
+#endif
+    
+#ifdef SK_CAN_USE_FLOAT
+    for (i = 0; i < 100000; i++) {
+        SkFract x = rand.nextU() >> 1;
+        double xx = (double)x / SK_Fract1;
+        SkFract xr = SkFractSqrt(x);
+        SkFract check = SkFloatToFract(sqrt(xx));
+        REPORTER_ASSERT(reporter, xr == check || xr == check-1 || xr == check+1);
+        
+        xr = SkFixedSqrt(x);
+        xx = (double)x / SK_Fixed1;
+        check = SkFloatToFixed(sqrt(xx));
+        REPORTER_ASSERT(reporter, xr == check || xr == check-1);
+        
+        xr = SkSqrt32(x);
+        xx = (double)x;
+        check = (int32_t)sqrt(xx);
+        REPORTER_ASSERT(reporter, xr == check || xr == check-1);
+    }
+#endif
+    
+#if !defined(SK_SCALAR_IS_FLOAT) && defined(SK_CAN_USE_FLOAT)
+    {
+        SkFixed s, c;
+        s = SkFixedSinCos(0, &c);
+        REPORTER_ASSERT(reporter, s == 0);
+        REPORTER_ASSERT(reporter, c == SK_Fixed1);
+    }
+    
+    int maxDiff = 0;
+    for (i = 0; i < 10000; i++) {
+        SkFixed rads = rand.nextS() >> 10;
+        double frads = SkFixedToFloat(rads);
+        
+        SkFixed s, c;
+        s = SkScalarSinCos(rads, &c);
+        
+        double fs = sin(frads);
+        double fc = cos(frads);
+        
+        SkFixed is = SkFloatToFixed(fs);
+        SkFixed ic = SkFloatToFixed(fc);
+        
+        maxDiff = SkMax32(maxDiff, SkAbs32(is - s));
+        maxDiff = SkMax32(maxDiff, SkAbs32(ic - c));
+    }
+    SkDebugf("SinCos: maximum error = %d\n", maxDiff);
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace skiatest {
+
+    class MathTest : public Test {
+    public:
+        static Test* Factory(void*) {
+            return SkNEW(MathTest);
+        }
+
+    protected:
+        virtual void onGetName(SkString* name) {
+            name->set("Math");
+        }
+        
+        virtual void onRun(Reporter* reporter) {
+            TestMath(reporter);
+        }
+    };
+
+    static TestRegistry gReg(MathTest::Factory);
+}
+
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
new file mode 100644
index 0000000..1e4e341
--- /dev/null
+++ b/tests/MatrixTest.cpp
@@ -0,0 +1,119 @@
+#include "Test.h"
+#include "SkMatrix.h"
+
+static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
+#ifdef SK_SCALAR_IS_FLOAT
+    const float tolerance = 0.000005f;
+#else
+    const int32_t tolerance = 3;
+#endif
+
+    return SkScalarAbs(a - b) <= tolerance;
+}
+
+static bool nearly_equal(const SkMatrix& a, const SkMatrix& b) {
+    for (int i = 0; i < 9; i++) {
+        if (!nearly_equal_scalar(a[i], b[i])) {
+            printf("not equal %g %g\n", a[i], b[i]);
+            return false;
+        }
+    }
+    return true;
+}
+
+static bool is_identity(const SkMatrix& m) {
+    SkMatrix identity;
+    identity.reset();    
+    return nearly_equal(m, identity);
+}
+
+void TestMatrix(skiatest::Reporter* reporter) {
+    SkMatrix    mat, inverse, iden1, iden2;
+
+    mat.reset();
+    mat.setTranslate(SK_Scalar1, SK_Scalar1);
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SkIntToScalar(2), SkIntToScalar(2));
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SK_Scalar1/2, SK_Scalar1/2);
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20), 0);
+    mat.postRotate(SkIntToScalar(25));
+    REPORTER_ASSERT(reporter, mat.invert(NULL));
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+    iden2.setConcat(inverse, mat);
+    REPORTER_ASSERT(reporter, is_identity(iden2));
+    
+    // rectStaysRect test
+    {
+        static const struct {
+            SkScalar    m00, m01, m10, m11;
+            bool        mStaysRect;
+        }
+        gRectStaysRectSamples[] = {
+            {          0,          0,          0,           0, false },
+            {          0,          0,          0,  SK_Scalar1, false },
+            {          0,          0, SK_Scalar1,           0, false },
+            {          0,          0, SK_Scalar1,  SK_Scalar1, false },
+            {          0, SK_Scalar1,          0,           0, false },
+            {          0, SK_Scalar1,          0,  SK_Scalar1, false },
+            {          0, SK_Scalar1, SK_Scalar1,           0, true },
+            {          0, SK_Scalar1, SK_Scalar1,  SK_Scalar1, false },
+            { SK_Scalar1,          0,          0,           0, false },
+            { SK_Scalar1,          0,          0,  SK_Scalar1, true },
+            { SK_Scalar1,          0, SK_Scalar1,           0, false },
+            { SK_Scalar1,          0, SK_Scalar1,  SK_Scalar1, false },
+            { SK_Scalar1, SK_Scalar1,          0,           0, false },
+            { SK_Scalar1, SK_Scalar1,          0,  SK_Scalar1, false },
+            { SK_Scalar1, SK_Scalar1, SK_Scalar1,           0, false },
+            { SK_Scalar1, SK_Scalar1, SK_Scalar1,  SK_Scalar1, false }
+        };
+        
+        for (size_t i = 0; i < SK_ARRAY_COUNT(gRectStaysRectSamples); i++) {
+            SkMatrix    m;
+            
+            m.reset();
+            m.set(SkMatrix::kMScaleX, gRectStaysRectSamples[i].m00);
+            m.set(SkMatrix::kMSkewX,  gRectStaysRectSamples[i].m01);
+            m.set(SkMatrix::kMSkewY,  gRectStaysRectSamples[i].m10);
+            m.set(SkMatrix::kMScaleY, gRectStaysRectSamples[i].m11);
+            REPORTER_ASSERT(reporter,
+                    m.rectStaysRect() == gRectStaysRectSamples[i].mStaysRect);
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace skiatest {
+
+    class MatrixTest : public Test {
+    public:
+        static Test* Factory(void*) {
+            return SkNEW(MatrixTest);
+        }
+
+    protected:
+        virtual void onGetName(SkString* name) {
+            name->set("Matrix");
+        }
+        
+        virtual void onRun(Reporter* reporter) {
+            TestMatrix(reporter);
+        }
+    };
+
+    static TestRegistry gReg(MatrixTest::Factory);
+}
+
diff --git a/tests/PackBitsTest.cpp b/tests/PackBitsTest.cpp
new file mode 100644
index 0000000..6e69f82
--- /dev/null
+++ b/tests/PackBitsTest.cpp
@@ -0,0 +1,144 @@
+#include "Test.h"
+#include "SkPackBits.h"
+
+static const uint16_t gTest0[] = { 0, 0, 1, 1 };
+static const uint16_t gTest1[] = { 1, 2, 3, 4, 5, 6 };
+static const uint16_t gTest2[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
+static const uint16_t gTest3[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
+
+#include "SkRandom.h"
+static SkRandom gRand;
+static void rand_fill(uint16_t buffer[], int count) {
+    for (int i = 0; i < count; i++)
+        buffer[i] = (uint16_t)gRand.nextU();
+}
+
+static void test_pack16(skiatest::Reporter* reporter) {
+    static const struct {
+        const uint16_t* fSrc;
+        int             fCount;
+    } gTests[] = {
+        { gTest0, SK_ARRAY_COUNT(gTest0) },
+        { gTest1, SK_ARRAY_COUNT(gTest1) },
+        { gTest2, SK_ARRAY_COUNT(gTest2) },
+        { gTest3, SK_ARRAY_COUNT(gTest3) }
+    };
+    
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gTests); i++) {
+        uint8_t dst[100];
+        size_t dstSize = SkPackBits::Pack16(gTests[i].fSrc,
+                                            gTests[i].fCount, dst);
+        uint16_t src[100];
+        int srcCount = SkPackBits::Unpack16(dst, dstSize, src);
+        bool match = gTests[i].fCount == srcCount && memcmp(gTests[i].fSrc, src,
+                                    gTests[i].fCount * sizeof(uint16_t)) == 0;
+        REPORTER_ASSERT(reporter, match);
+    }
+    
+    for (int n = 1000; n; n--) {
+        size_t size = 50;
+        uint16_t src[100], src2[100];
+        uint8_t dst[200];
+        rand_fill(src, size);
+
+        size_t dstSize = SkPackBits::Pack16(src, size, dst);
+        size_t maxSize = SkPackBits::ComputeMaxSize16(size);
+        REPORTER_ASSERT(reporter, maxSize >= dstSize);
+
+        int srcCount = SkPackBits::Unpack16(dst, dstSize, src2);
+        REPORTER_ASSERT(reporter, size == srcCount);
+        bool match = memcmp(src, src2, size * sizeof(uint16_t)) == 0;
+        REPORTER_ASSERT(reporter, match);
+    }
+}
+
+static const uint8_t gTest80[] = { 0, 0, 1, 1 };
+static const uint8_t gTest81[] = { 1, 2, 3, 4, 5, 6 };
+static const uint8_t gTest82[] = { 0, 0, 0, 1, 2, 3, 3, 3 };
+static const uint8_t gTest83[] = { 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 0, 0, 1 };
+static const uint8_t gTest84[] = { 1, 0, 3, 0, 0, 0, 2, 1, 1, 2 };
+
+static void rand_fill(uint8_t buffer[], int count) {
+    for (int i = 0; i < count; i++)
+        buffer[i] = (uint8_t)((gRand.nextU() >> 8) & 0x3);
+}
+
+static void test_pack8(skiatest::Reporter* reporter) {
+    static const struct {
+        const uint8_t* fSrc;
+        int             fCount;
+    } gTests[] = {
+        { gTest80, SK_ARRAY_COUNT(gTest80) },
+        { gTest81, SK_ARRAY_COUNT(gTest81) },
+        { gTest82, SK_ARRAY_COUNT(gTest82) },
+        { gTest83, SK_ARRAY_COUNT(gTest83) },
+        { gTest84, SK_ARRAY_COUNT(gTest84) }
+    };
+    
+    for (size_t i = 4; i < SK_ARRAY_COUNT(gTests); i++) {
+        uint8_t dst[100];
+        size_t maxSize = SkPackBits::ComputeMaxSize8(gTests[i].fCount);
+        size_t dstSize = SkPackBits::Pack8(gTests[i].fSrc,
+                                           gTests[i].fCount, dst);
+        REPORTER_ASSERT(reporter, dstSize <= maxSize);
+        uint8_t src[100];
+        int srcCount = SkPackBits::Unpack8(dst, dstSize, src);
+        bool match = gTests[i].fCount == srcCount &&
+                    memcmp(gTests[i].fSrc, src,
+                           gTests[i].fCount * sizeof(uint8_t)) == 0;
+        REPORTER_ASSERT(reporter, match);
+    }
+
+    for (size_t size = 1; size <= 512; size += 1) {
+        for (int n = 200; n; n--) {
+            uint8_t src[600], src2[600];
+            uint8_t dst[600];
+            rand_fill(src, size);
+
+            size_t dstSize = SkPackBits::Pack8(src, size, dst);
+            size_t maxSize = SkPackBits::ComputeMaxSize8(size);
+            REPORTER_ASSERT(reporter, maxSize >= dstSize);
+
+            int srcCount = SkPackBits::Unpack8(dst, dstSize, src2);
+            REPORTER_ASSERT(reporter, size == srcCount);
+            bool match = memcmp(src, src2, size * sizeof(uint8_t)) == 0;
+            REPORTER_ASSERT(reporter, match);
+            
+            for (int j = 0; j < 200; j++) {
+                size_t skip = gRand.nextU() % size;
+                size_t write = gRand.nextU() % size;
+                if (skip + write > size) {
+                    write = size - skip;
+                }
+                SkPackBits::Unpack8(src, skip, write, dst);
+                bool match = memcmp(src, src2 + skip, write) == 0;
+                REPORTER_ASSERT(reporter, match);
+            }
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace skiatest {
+    
+    class PackBitsTest : public Test {
+    public:
+        static Test* Factory(void*) {
+            return SkNEW(PackBitsTest);
+        }
+        
+    protected:
+        virtual void onGetName(SkString* name) {
+            name->set("PackBits");
+        }
+        
+        virtual void onRun(Reporter* reporter) {
+            test_pack8(reporter);
+            test_pack16(reporter);
+        }
+    };
+    
+    static TestRegistry gReg(PackBitsTest::Factory);
+}
+
diff --git a/tests/Test.cpp b/tests/Test.cpp
new file mode 100644
index 0000000..5b8d439
--- /dev/null
+++ b/tests/Test.cpp
@@ -0,0 +1,60 @@
+#include "Test.h"
+
+using namespace skiatest;
+
+Reporter::Reporter() {
+    this->resetReporting();
+}
+
+void Reporter::resetReporting() {
+    fCurrTest = NULL;
+    fTestCount = 0;
+    bzero(fResultCount, sizeof(fResultCount));
+}
+
+void Reporter::startTest(Test* test) {
+    SkASSERT(NULL == fCurrTest);
+    fCurrTest = test;
+    this->onStart(test);
+    fTestCount += 1;
+}
+
+void Reporter::report(const char desc[], Result result) {
+    if (NULL == desc) {
+        desc = "<no description>";
+    }
+    this->onReport(desc, result);
+    fResultCount[result] += 1;
+}
+
+void Reporter::endTest(Test* test) {
+    SkASSERT(test == fCurrTest);
+    this->onEnd(test);
+    fCurrTest = NULL;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+Test::Test() : fReporter(NULL) {}
+
+Test::~Test() {
+    fReporter->safeUnref();
+}
+
+void Test::setReporter(Reporter* r) {
+    SkRefCnt_SafeAssign(fReporter, r);
+}
+
+const char* Test::getName() {
+    if (fName.size() == 0) {
+        this->onGetName(&fName);
+    }
+    return fName.c_str();
+}
+
+void Test::run() {
+    fReporter->startTest(this);
+    this->onRun(fReporter);
+    fReporter->endTest(this);
+}
+
diff --git a/tests/Test.h b/tests/Test.h
new file mode 100644
index 0000000..8d2eb87
--- /dev/null
+++ b/tests/Test.h
@@ -0,0 +1,98 @@
+#ifndef skiatest_Test_DEFINED
+#define skiatest_Test_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkString.h"
+#include "SkTRegistry.h"
+
+namespace skiatest {
+    
+    class Test;
+
+    class Reporter : public SkRefCnt {
+    public:
+        Reporter();
+
+        enum Result {
+            kPassed,    // must begin with 0
+            kFailed,
+            /////
+            kLastResult = kFailed
+        };
+        
+        void resetReporting();
+        int countTests() const { return fTestCount; }
+        int countResults(Result r) {
+            SkASSERT((unsigned)r <= kLastResult);
+            return fResultCount[r];
+        }
+
+        void startTest(Test*);
+        void report(const char testDesc[], Result);
+        void endTest(Test*);
+        
+        // helpers for tests
+        void assertTrue(bool cond, const char desc[]) {
+            if (!cond) {
+                this->report(desc, kFailed);
+            }
+        }
+        void assertFalse(bool cond, const char desc[]) {
+            if (cond) {
+                this->report(desc, kFailed);
+            }
+        }
+        void reportFailed(const char desc[]) {
+            this->report(desc, kFailed);
+        }
+        void reportFailed(const SkString& desc) {
+            this->report(desc.c_str(), kFailed);
+        }
+        
+    protected:
+        virtual void onStart(Test*) {}
+        virtual void onReport(const char desc[], Result) {}
+        virtual void onEnd(Test*) {}
+        
+    private:
+        Test* fCurrTest;
+        int fTestCount;
+        int fResultCount[kLastResult+1];
+        
+        typedef SkRefCnt INHERITED;
+    };
+    
+    class Test {
+    public:        
+        Test();
+        virtual ~Test();
+
+        Reporter* getReporter() const { return fReporter; }
+        void setReporter(Reporter*);
+        
+        const char* getName();
+        void run();
+        
+    protected:
+        virtual void onGetName(SkString*) = 0;
+        virtual void onRun(Reporter*) = 0;
+        
+    private:
+        Reporter*   fReporter;
+        SkString    fName;
+    };
+
+    typedef SkTRegistry<Test*, void*> TestRegistry;
+}
+
+#define REPORTER_ASSERT(r, cond)                                        \
+    do {                                                                \
+        if (!(cond)) {                                                  \
+            SkString desc;                                              \
+            desc.printf("%s:%d: %s", __FILE__, __LINE__, #cond);      \
+            r->reportFailed(desc);                                      \
+        }                                                               \
+    } while(0)
+
+
+#endif
diff --git a/tests/TestXCode/Tests.xcodeproj/project.pbxproj b/tests/TestXCode/Tests.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..004fb22
--- /dev/null
+++ b/tests/TestXCode/Tests.xcodeproj/project.pbxproj
@@ -0,0 +1,333 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 44;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		00857F860F56F8EE0078BE26 /* libcore.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 00857F730F56F71B0078BE26 /* libcore.a */; };
+		00857F920F56F9170078BE26 /* libmaccore.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 00857F910F56F9150078BE26 /* libmaccore.a */; };
+		00857FAA0F56F9620078BE26 /* Test.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00857FA80F56F9620078BE26 /* Test.cpp */; };
+		00857FAB0F56F9620078BE26 /* main.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00857FA90F56F9620078BE26 /* main.cpp */; };
+		00857FB70F56FD340078BE26 /* MathTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 00857FB60F56FD340078BE26 /* MathTest.cpp */; };
+		008634DC0F579B7A0044DA64 /* PackBitsTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 008634DB0F579B7A0044DA64 /* PackBitsTest.cpp */; };
+		008634F10F579E410044DA64 /* MatrixTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 008634F00F579E410044DA64 /* MatrixTest.cpp */; };
+		0086350F0F57A3140044DA64 /* UtilsTest.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 0086350E0F57A3140044DA64 /* UtilsTest.cpp */; };
+		8DD76F6A0486A84900D96B5E /* Tests.1 in CopyFiles */ = {isa = PBXBuildFile; fileRef = C6859E8B029090EE04C91782 /* Tests.1 */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXContainerItemProxy section */
+		00857F720F56F71B0078BE26 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 00857F6B0F56F71B0078BE26 /* core.xcodeproj */;
+			proxyType = 2;
+			remoteGlobalIDString = D2AAC046055464E500DB518D;
+			remoteInfo = core;
+		};
+		00857F900F56F9150078BE26 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 00857F890F56F9150078BE26 /* maccore.xcodeproj */;
+			proxyType = 2;
+			remoteGlobalIDString = D2AAC046055464E500DB518D;
+			remoteInfo = maccore;
+		};
+		0086351C0F57A51A0044DA64 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 00857F6B0F56F71B0078BE26 /* core.xcodeproj */;
+			proxyType = 1;
+			remoteGlobalIDString = D2AAC045055464E500DB518D /* core */;
+			remoteInfo = core;
+		};
+		0086351E0F57A5200044DA64 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 00857F890F56F9150078BE26 /* maccore.xcodeproj */;
+			proxyType = 1;
+			remoteGlobalIDString = D2AAC045055464E500DB518D /* maccore */;
+			remoteInfo = maccore;
+		};
+/* End PBXContainerItemProxy section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		8DD76F690486A84900D96B5E /* CopyFiles */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 8;
+			dstPath = /usr/share/man/man1/;
+			dstSubfolderSpec = 0;
+			files = (
+				8DD76F6A0486A84900D96B5E /* Tests.1 in CopyFiles */,
+			);
+			runOnlyForDeploymentPostprocessing = 1;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		00857F630F56F4220078BE26 /* Test.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Test.h; path = ../Test.h; sourceTree = SOURCE_ROOT; };
+		00857F6B0F56F71B0078BE26 /* core.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = core.xcodeproj; path = ../../xcode/core/core.xcodeproj; sourceTree = SOURCE_ROOT; };
+		00857F890F56F9150078BE26 /* maccore.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = maccore.xcodeproj; path = ../../xcode/maccore/maccore.xcodeproj; sourceTree = SOURCE_ROOT; };
+		00857FA80F56F9620078BE26 /* Test.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Test.cpp; path = ../Test.cpp; sourceTree = SOURCE_ROOT; };
+		00857FA90F56F9620078BE26 /* main.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = main.cpp; path = ../main.cpp; sourceTree = SOURCE_ROOT; };
+		00857FB60F56FD340078BE26 /* MathTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MathTest.cpp; path = ../MathTest.cpp; sourceTree = SOURCE_ROOT; };
+		008634DB0F579B7A0044DA64 /* PackBitsTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = PackBitsTest.cpp; path = ../PackBitsTest.cpp; sourceTree = SOURCE_ROOT; };
+		008634F00F579E410044DA64 /* MatrixTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = MatrixTest.cpp; path = ../MatrixTest.cpp; sourceTree = SOURCE_ROOT; };
+		0086350E0F57A3140044DA64 /* UtilsTest.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = UtilsTest.cpp; path = ../UtilsTest.cpp; sourceTree = SOURCE_ROOT; };
+		8DD76F6C0486A84900D96B5E /* Tests */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = Tests; sourceTree = BUILT_PRODUCTS_DIR; };
+		C6859E8B029090EE04C91782 /* Tests.1 */ = {isa = PBXFileReference; lastKnownFileType = text.man; path = Tests.1; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		8DD76F660486A84900D96B5E /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				00857F860F56F8EE0078BE26 /* libcore.a in Frameworks */,
+				00857F920F56F9170078BE26 /* libmaccore.a in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		00857F6C0F56F71B0078BE26 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				00857F730F56F71B0078BE26 /* libcore.a */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		00857F8A0F56F9150078BE26 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				00857F910F56F9150078BE26 /* libmaccore.a */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		08FB7794FE84155DC02AAC07 /* Tests */ = {
+			isa = PBXGroup;
+			children = (
+				00857F890F56F9150078BE26 /* maccore.xcodeproj */,
+				00857F6B0F56F71B0078BE26 /* core.xcodeproj */,
+				08FB7795FE84155DC02AAC07 /* Source */,
+				C6859E8C029090F304C91782 /* Documentation */,
+				1AB674ADFE9D54B511CA2CBB /* Products */,
+			);
+			name = Tests;
+			sourceTree = "<group>";
+		};
+		08FB7795FE84155DC02AAC07 /* Source */ = {
+			isa = PBXGroup;
+			children = (
+				00857FA80F56F9620078BE26 /* Test.cpp */,
+				00857FA90F56F9620078BE26 /* main.cpp */,
+				00857F630F56F4220078BE26 /* Test.h */,
+				00857FB60F56FD340078BE26 /* MathTest.cpp */,
+				0086350E0F57A3140044DA64 /* UtilsTest.cpp */,
+				008634F00F579E410044DA64 /* MatrixTest.cpp */,
+				008634DB0F579B7A0044DA64 /* PackBitsTest.cpp */,
+			);
+			name = Source;
+			sourceTree = "<group>";
+		};
+		1AB674ADFE9D54B511CA2CBB /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				8DD76F6C0486A84900D96B5E /* Tests */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		C6859E8C029090F304C91782 /* Documentation */ = {
+			isa = PBXGroup;
+			children = (
+				C6859E8B029090EE04C91782 /* Tests.1 */,
+			);
+			name = Documentation;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		8DD76F620486A84900D96B5E /* Tests */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 1DEB923108733DC60010E9CD /* Build configuration list for PBXNativeTarget "Tests" */;
+			buildPhases = (
+				8DD76F640486A84900D96B5E /* Sources */,
+				8DD76F660486A84900D96B5E /* Frameworks */,
+				8DD76F690486A84900D96B5E /* CopyFiles */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+				0086351D0F57A51A0044DA64 /* PBXTargetDependency */,
+				0086351F0F57A5200044DA64 /* PBXTargetDependency */,
+			);
+			name = Tests;
+			productInstallPath = "$(HOME)/bin";
+			productName = Tests;
+			productReference = 8DD76F6C0486A84900D96B5E /* Tests */;
+			productType = "com.apple.product-type.tool";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		08FB7793FE84155DC02AAC07 /* Project object */ = {
+			isa = PBXProject;
+			buildConfigurationList = 1DEB923508733DC60010E9CD /* Build configuration list for PBXProject "Tests" */;
+			compatibilityVersion = "Xcode 3.0";
+			hasScannedForEncodings = 1;
+			mainGroup = 08FB7794FE84155DC02AAC07 /* Tests */;
+			projectDirPath = "";
+			projectReferences = (
+				{
+					ProductGroup = 00857F6C0F56F71B0078BE26 /* Products */;
+					ProjectRef = 00857F6B0F56F71B0078BE26 /* core.xcodeproj */;
+				},
+				{
+					ProductGroup = 00857F8A0F56F9150078BE26 /* Products */;
+					ProjectRef = 00857F890F56F9150078BE26 /* maccore.xcodeproj */;
+				},
+			);
+			projectRoot = "";
+			targets = (
+				8DD76F620486A84900D96B5E /* Tests */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXReferenceProxy section */
+		00857F730F56F71B0078BE26 /* libcore.a */ = {
+			isa = PBXReferenceProxy;
+			fileType = archive.ar;
+			path = libcore.a;
+			remoteRef = 00857F720F56F71B0078BE26 /* PBXContainerItemProxy */;
+			sourceTree = BUILT_PRODUCTS_DIR;
+		};
+		00857F910F56F9150078BE26 /* libmaccore.a */ = {
+			isa = PBXReferenceProxy;
+			fileType = archive.ar;
+			path = libmaccore.a;
+			remoteRef = 00857F900F56F9150078BE26 /* PBXContainerItemProxy */;
+			sourceTree = BUILT_PRODUCTS_DIR;
+		};
+/* End PBXReferenceProxy section */
+
+/* Begin PBXSourcesBuildPhase section */
+		8DD76F640486A84900D96B5E /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				00857FAA0F56F9620078BE26 /* Test.cpp in Sources */,
+				00857FAB0F56F9620078BE26 /* main.cpp in Sources */,
+				00857FB70F56FD340078BE26 /* MathTest.cpp in Sources */,
+				008634DC0F579B7A0044DA64 /* PackBitsTest.cpp in Sources */,
+				008634F10F579E410044DA64 /* MatrixTest.cpp in Sources */,
+				0086350F0F57A3140044DA64 /* UtilsTest.cpp in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin PBXTargetDependency section */
+		0086351D0F57A51A0044DA64 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			name = core;
+			targetProxy = 0086351C0F57A51A0044DA64 /* PBXContainerItemProxy */;
+		};
+		0086351F0F57A5200044DA64 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			name = maccore;
+			targetProxy = 0086351E0F57A5200044DA64 /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
+/* Begin XCBuildConfiguration section */
+		1DEB923208733DC60010E9CD /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				COPY_PHASE_STRIP = NO;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_ENABLE_FIX_AND_CONTINUE = YES;
+				GCC_MODEL_TUNING = G5;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"_GLIBCXX_DEBUG=1",
+					"_GLIBCXX_DEBUG_PEDANTIC=1",
+				);
+				INSTALL_PATH = /usr/local/bin;
+				PRODUCT_NAME = Tests;
+			};
+			name = Debug;
+		};
+		1DEB923308733DC60010E9CD /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				GCC_MODEL_TUNING = G5;
+				INSTALL_PATH = /usr/local/bin;
+				PRODUCT_NAME = Tests;
+			};
+			name = Release;
+		};
+		1DEB923608733DC60010E9CD /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ARCHS = "$(NATIVE_ARCH)";
+				GCC_C_LANGUAGE_STANDARD = c99;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = "../../../**";
+				ONLY_ACTIVE_ARCH = NO;
+				PREBINDING = NO;
+				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
+				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				VALID_ARCHS = "i386 x86_64";
+			};
+			name = Debug;
+		};
+		1DEB923708733DC60010E9CD /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ARCHS = "$(NATIVE_ARCH)";
+				GCC_C_LANGUAGE_STANDARD = c99;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = "../../../**";
+				ONLY_ACTIVE_ARCH = NO;
+				PREBINDING = NO;
+				PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = NO;
+				SDKROOT = "$(DEVELOPER_SDK_DIR)/MacOSX10.4u.sdk";
+				VALID_ARCHS = "i386 x86_64";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		1DEB923108733DC60010E9CD /* Build configuration list for PBXNativeTarget "Tests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				1DEB923208733DC60010E9CD /* Debug */,
+				1DEB923308733DC60010E9CD /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		1DEB923508733DC60010E9CD /* Build configuration list for PBXProject "Tests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				1DEB923608733DC60010E9CD /* Debug */,
+				1DEB923708733DC60010E9CD /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 08FB7793FE84155DC02AAC07 /* Project object */;
+}
diff --git a/tests/UtilsTest.cpp b/tests/UtilsTest.cpp
new file mode 100644
index 0000000..810cb51
--- /dev/null
+++ b/tests/UtilsTest.cpp
@@ -0,0 +1,130 @@
+#include "Test.h"
+#include "SkRandom.h"
+#include "SkTSearch.h"
+#include "SkTSort.h"
+#include "SkUtils.h"
+
+#define kSEARCH_COUNT   91
+
+static void test_search(skiatest::Reporter* reporter) {
+    int         i, array[kSEARCH_COUNT];
+    SkRandom    rand;
+
+    for (i = 0; i < kSEARCH_COUNT; i++) {
+        array[i] = rand.nextS();
+    }
+
+    SkTHeapSort<int>(array, kSEARCH_COUNT);
+    // make sure we got sorted properly
+    for (i = 1; i < kSEARCH_COUNT; i++) {
+        REPORTER_ASSERT(reporter, array[i-1] <= array[i]);
+    }
+
+    // make sure we can find all of our values
+    for (i = 0; i < kSEARCH_COUNT; i++) {
+        int index = SkTSearch<int>(array, kSEARCH_COUNT, array[i], sizeof(int));
+        REPORTER_ASSERT(reporter, index == i);
+    }
+
+    // make sure that random values are either found, or the correct
+    // insertion index is returned
+    for (i = 0; i < 10000; i++) {
+        int value = rand.nextS();
+        int index = SkTSearch<int>(array, kSEARCH_COUNT, value, sizeof(int));
+
+        if (index >= 0) {
+            REPORTER_ASSERT(reporter,
+                            index < kSEARCH_COUNT && array[index] == value);
+        } else {
+            index = ~index;
+            REPORTER_ASSERT(reporter, index <= kSEARCH_COUNT);
+            if (index < kSEARCH_COUNT) {
+                REPORTER_ASSERT(reporter, value < array[index]);
+                if (index > 0) {
+                    REPORTER_ASSERT(reporter, value > array[index - 1]);
+                }
+            } else {
+                // we should append the new value
+                REPORTER_ASSERT(reporter, value > array[kSEARCH_COUNT - 1]);
+            }
+        }
+    }
+}
+
+static void test_utf16(skiatest::Reporter* reporter) {
+    static const SkUnichar gUni[] = {
+        0x10000, 0x18080, 0x20202, 0xFFFFF, 0x101234
+    };
+    
+    uint16_t buf[2];
+    
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gUni); i++) {
+        size_t count = SkUTF16_FromUnichar(gUni[i], buf);
+        REPORTER_ASSERT(reporter, count == 2);
+        size_t count2 = SkUTF16_CountUnichars(buf, 2);
+        REPORTER_ASSERT(reporter, count2 == 1);
+        const uint16_t* ptr = buf;
+        SkUnichar c = SkUTF16_NextUnichar(&ptr);
+        REPORTER_ASSERT(reporter, c == gUni[i]);
+        REPORTER_ASSERT(reporter, ptr - buf == 2);
+    }
+}
+
+static void TestUTF(skiatest::Reporter* reporter) {
+    static const struct {
+        const char* fUtf8;
+        SkUnichar   fUni;
+    } gTest[] = {
+        { "a",                  'a' },
+        { "\x7f",               0x7f },
+        { "\xC2\x80",           0x80 },
+        { "\xC3\x83",           (3 << 6) | 3    },
+        { "\xDF\xBF",           0x7ff },
+        { "\xE0\xA0\x80",       0x800 },
+        { "\xE0\xB0\xB8",       0xC38 },
+        { "\xE3\x83\x83",       (3 << 12) | (3 << 6) | 3    },
+        { "\xEF\xBF\xBF",       0xFFFF },
+        { "\xF0\x90\x80\x80",   0x10000 },
+        { "\xF3\x83\x83\x83",   (3 << 18) | (3 << 12) | (3 << 6) | 3    }
+    };
+
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gTest); i++) {
+        const char* p = gTest[i].fUtf8;
+        int         n = SkUTF8_CountUnichars(p);
+        SkUnichar   u0 = SkUTF8_ToUnichar(gTest[i].fUtf8);
+        SkUnichar   u1 = SkUTF8_NextUnichar(&p);
+
+        REPORTER_ASSERT(reporter, n == 1);
+        REPORTER_ASSERT(reporter, u0 == u1);
+        REPORTER_ASSERT(reporter, u0 == gTest[i].fUni);
+        REPORTER_ASSERT(reporter,
+                        p - gTest[i].fUtf8 == (int)strlen(gTest[i].fUtf8));
+    }
+    
+    test_utf16(reporter);
+    test_search(reporter);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace skiatest {
+    
+    class UtfTest : public Test {
+    public:
+        static Test* Factory(void*) {
+            return SkNEW(UtfTest);
+        }
+        
+    protected:
+        virtual void onGetName(SkString* name) {
+            name->set("UTF");
+        }
+        
+        virtual void onRun(Reporter* reporter) {
+            TestUTF(reporter);
+        }
+    };
+    
+    static TestRegistry gReg(UtfTest::Factory);
+}
+
diff --git a/tests/main.cpp b/tests/main.cpp
new file mode 100644
index 0000000..0b82af4
--- /dev/null
+++ b/tests/main.cpp
@@ -0,0 +1,67 @@
+#include <iostream>
+
+#include "Test.h"
+
+using namespace skiatest;
+
+class Iter {
+public:
+    Iter(Reporter* r) : fReporter(r) {
+        r->ref();
+        fReg = TestRegistry::Head();
+    }
+    
+    ~Iter() {
+        fReporter->unref();
+    }
+    
+    Test* next() {
+        if (fReg) {
+            TestRegistry::Factory fact = fReg->factory();
+            fReg = fReg->next();
+            Test* test = fact(NULL);
+            test->setReporter(fReporter);
+            return test;
+        }
+        return NULL;
+    }
+    
+private:
+    Reporter* fReporter;
+    const TestRegistry* fReg;
+};
+
+static const char* result2string(Reporter::Result result) {
+    return result == Reporter::kPassed ? "passed" : "FAILED";
+}
+
+class PrintfReporter : public Reporter {
+protected:
+    virtual void onStart(Test* test) {
+        printf("Running %s...\n", test->getName());
+    }
+    virtual void onReport(const char desc[], Reporter::Result result) {
+        printf("\t%s: %s\n", result2string(result), desc);
+    }
+    virtual void onEnd(Test* test) {}
+};
+
+int main (int argc, char * const argv[]) {
+    PrintfReporter reporter;
+    Iter iter(&reporter);
+    Test* test;
+    
+    while ((test = iter.next()) != NULL) {
+        test->run();
+        SkDELETE(test);
+    }
+    
+    int total = reporter.countTests();
+    int passed = reporter.countResults(Reporter::kPassed);
+    int failed = reporter.countResults(Reporter::kFailed);
+    printf("Tests=%d Passed=%d (%g%%) Failed=%d (%g%%)\n", total,
+           passed, passed * 100.f / total,
+           failed, failed * 100.f / total);
+
+    return 0;
+}