test/mjsunit/mjsunit.js

// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

function MjsUnitAssertionError(message) {
  this.message = message;
  // This allows fetching the stack trace using TryCatch::StackTrace.
  this.stack = new Error("").stack;
}

/*
 * This file is included in all mini jsunit test cases.  The test
 * framework expects lines that signal failed tests to start with
 * the f-word and ignore all other lines.
 */


MjsUnitAssertionError.prototype.toString = function () {
  return this.message;
};


// Expected and found values the same objects, or the same primitive
// values.
// For known primitive values, please use assertEquals.
var assertSame;

// Expected and found values are identical primitive values or functions
// or similarly structured objects (checking internal properties
// of, e.g., Number and Date objects, the elements of arrays
// and the properties of non-Array objects).
var assertEquals;

// The found object is an Array with the same length and elements
// as the expected object. The expected object doesn't need to be an Array,
// as long as it's "array-ish".
var assertArrayEquals;

// The found object must have the same enumerable properties as the
// expected object. The type of object isn't checked.
var assertPropertiesEqual;

// Assert that the string conversion of the found value is equal to
// the expected string. Only kept for backwards compatability, please
// check the real structure of the found value.
var assertToStringEquals;

// Checks that the found value is true. Use with boolean expressions
// for tests that doesn't have their own assertXXX function.
var assertTrue;

// Checks that the found value is false.
var assertFalse;

// Checks that the found value is null. Kept for historical compatability,
// please just use assertEquals(null, expected).
var assertNull;

// Checks that the found value is *not* null.
var assertNotNull;

// Assert that the passed function or eval code throws an exception.
// The optional second argument is an exception constructor that the
// thrown exception is checked against with "instanceof".
// The optional third argument is a message type string that is compared
// to the type property on the thrown exception.
var assertThrows;

// Assert that the passed function or eval code does not throw an exception.
var assertDoesNotThrow;

// Asserts that the found value is an instance of the constructor passed
// as the second argument.
var assertInstanceof;

// Assert that this code is never executed (i.e., always fails if executed).
var assertUnreachable;

(function () {  // Scope for utility functions.

  function classOf(object) {
    // Argument must not be null or undefined.
    var string = Object.prototype.toString.call(object);
    // String has format [object <ClassName>].
    return string.substring(8, string.length - 1);
  }


  function PrettyPrint(value) {
    switch (typeof value) {
      case "string":
        return JSON.stringify(value);
      case "number":
        if (value === 0 && (1 / value) < 0) return "-0";
        // FALLTHROUGH.
      case "boolean":
      case "undefined":
      case "function":
        return String(value);
      case "object":
        if (value === null) return "null";
        var objectClass = classOf(value);
        switch (objectClass) {
        case "Number":
        case "String":
        case "Boolean":
        case "Date":
          return objectClass + "(" + PrettyPrint(value.valueOf()) + ")";
        case "RegExp":
          return value.toString();
        case "Array":
          return "[" + value.map(PrettyPrintArrayElement).join(",") + "]";
        case "Object":
          break;
        default:
          return objectClass + "()";
        }
        // [[Class]] is "Object".
        var name = value.constructor.name;
        if (name) return name + "()";
        return "Object()";
      default:
        return "-- unknown value --";
    }
  }


  function PrettyPrintArrayElement(value, index, array) {
    if (value === undefined && !(index in array)) return "";
    return PrettyPrint(value);
  }


  function fail(expectedText, found, name_opt) {
    var message = "Fail" + "ure";
    if (name_opt) {
      // Fix this when we ditch the old test runner.
      message += " (" + name_opt + ")";
    }

    message += ": expected <" + expectedText +
        "> found <" + PrettyPrint(found) + ">";
    throw new MjsUnitAssertionError(message);
  }


  function deepObjectEquals(a, b) {
    var aProps = Object.keys(a);
    aProps.sort();
    var bProps = Object.keys(b);
    bProps.sort();
    if (!deepEquals(aProps, bProps)) {
      return false;
    }
    for (var i = 0; i < aProps.length; i++) {
      if (!deepEquals(a[aProps[i]], b[aProps[i]])) {
        return false;
      }
    }
    return true;
  }


  function deepEquals(a, b) {
    if (a === b) {
      // Check for -0.
      if (a === 0) return (1 / a) === (1 / b);
      return true;
    }
    if (typeof a != typeof b) return false;
    if (typeof a == "number") return isNaN(a) && isNaN(b);
    if (typeof a !== "object" && typeof a !== "function") return false;
    // Neither a nor b is primitive.
    var objectClass = classOf(a);
    if (objectClass !== classOf(b)) return false;
    if (objectClass === "RegExp") {
      // For RegExp, just compare pattern and flags using its toString.
      return (a.toString() === b.toString());
    }
    // Functions are only identical to themselves.
    if (objectClass === "Function") return false;
    if (objectClass === "Array") {
      var elementCount = 0;
      if (a.length != b.length) {
        return false;
      }
      for (var i = 0; i < a.length; i++) {
        if (!deepEquals(a[i], b[i])) return false;
      }
      return true;
    }
    if (objectClass == "String" || objectClass == "Number" ||
      objectClass == "Boolean" || objectClass == "Date") {
      if (a.valueOf() !== b.valueOf()) return false;
    }
    return deepObjectEquals(a, b);
  }


  assertSame = function assertSame(expected, found, name_opt) {
    // TODO(mstarzinger): We should think about using Harmony's egal operator
    // or the function equivalent Object.is() here.
    if (found === expected) {
      if (expected !== 0 || (1 / expected) == (1 / found)) return;
    } else if ((expected !== expected) && (found !== found)) {
      return;
    }
    fail(PrettyPrint(expected), found, name_opt);
  };


  assertEquals = function assertEquals(expected, found, name_opt) {
    if (!deepEquals(found, expected)) {
      fail(PrettyPrint(expected), found, name_opt);
    }
  };


  assertArrayEquals = function assertArrayEquals(expected, found, name_opt) {
    var start = "";
    if (name_opt) {
      start = name_opt + " - ";
    }
    assertEquals(expected.length, found.length, start + "array length");
    if (expected.length == found.length) {
      for (var i = 0; i < expected.length; ++i) {
        assertEquals(expected[i], found[i],
                     start + "array element at index " + i);
      }
    }
  };


  assertPropertiesEqual = function assertPropertiesEqual(expected, found,
                                                         name_opt) {
    // Check properties only.
    if (!deepObjectEquals(expected, found)) {
      fail(expected, found, name_opt);
    }
  };


  assertToStringEquals = function assertToStringEquals(expected, found,
                                                       name_opt) {
    if (expected != String(found)) {
      fail(expected, found, name_opt);
    }
  };


  assertTrue = function assertTrue(value, name_opt) {
    assertEquals(true, value, name_opt);
  };


  assertFalse = function assertFalse(value, name_opt) {
    assertEquals(false, value, name_opt);
  };


  assertNull = function assertNull(value, name_opt) {
    if (value !== null) {
      fail("null", value, name_opt);
    }
  };


  assertNotNull = function assertNotNull(value, name_opt) {
    if (value === null) {
      fail("not null", value, name_opt);
    }
  };


  assertThrows = function assertThrows(code, type_opt, cause_opt) {
    var threwException = true;
    try {
      if (typeof code == 'function') {
        code();
      } else {
        eval(code);
      }
      threwException = false;
    } catch (e) {
      if (typeof type_opt == 'function') {
        assertInstanceof(e, type_opt);
      }
      if (arguments.length >= 3) {
        assertEquals(e.type, cause_opt);
      }
      // Success.
      return;
    }
    throw new MjsUnitAssertionError("Did not throw exception");
  };


  assertInstanceof = function assertInstanceof(obj, type) {
    if (!(obj instanceof type)) {
      var actualTypeName = null;
      var actualConstructor = Object.prototypeOf(obj).constructor;
      if (typeof actualConstructor == "function") {
        actualTypeName = actualConstructor.name || String(actualConstructor);
      }
      fail("Object <" + PrettyPrint(obj) + "> is not an instance of <" +
               (type.name || type) + ">" +
               (actualTypeName ? " but of < " + actualTypeName + ">" : ""));
    }
  };


   assertDoesNotThrow = function assertDoesNotThrow(code, name_opt) {
    try {
      if (typeof code == 'function') {
        code();
      } else {
        eval(code);
      }
    } catch (e) {
      fail("threw an exception: ", e.message || e, name_opt);
    }
  };

  assertUnreachable = function assertUnreachable(name_opt) {
    // Fix this when we ditch the old test runner.
    var message = "Fail" + "ure: unreachable";
    if (name_opt) {
      message += " - " + name_opt;
    }
    throw new MjsUnitAssertionError(message);
  };

})();