Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 1 | // Copyright 2017 The Bazel Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package skylark_test |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "fmt" |
| 10 | "math" |
| 11 | "path/filepath" |
| 12 | "strings" |
| 13 | "testing" |
| 14 | |
| 15 | "github.com/google/skylark" |
| 16 | "github.com/google/skylark/internal/chunkedfile" |
| 17 | "github.com/google/skylark/resolve" |
| 18 | "github.com/google/skylark/skylarktest" |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 19 | "github.com/google/skylark/syntax" |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 20 | ) |
| 21 | |
| 22 | func init() { |
| 23 | // The tests make extensive use of these not-yet-standard features. |
| 24 | resolve.AllowLambda = true |
| 25 | resolve.AllowNestedDef = true |
| 26 | resolve.AllowFloat = true |
Alan Donovan | 312d1a5 | 2017-10-02 10:10:28 -0400 | [diff] [blame] | 27 | resolve.AllowSet = true |
| 28 | } |
| 29 | |
| 30 | func TestEvalExpr(t *testing.T) { |
| 31 | // This is mostly redundant with the new *.sky tests. |
| 32 | // TODO(adonovan): move checks into *.sky files and |
| 33 | // reduce this to a mere unit test of skylark.Eval. |
| 34 | thread := new(skylark.Thread) |
| 35 | for _, test := range []struct{ src, want string }{ |
| 36 | {`123`, `123`}, |
| 37 | {`-1`, `-1`}, |
| 38 | {`"a"+"b"`, `"ab"`}, |
| 39 | {`1+2`, `3`}, |
| 40 | |
| 41 | // lists |
| 42 | {`[]`, `[]`}, |
| 43 | {`[1]`, `[1]`}, |
| 44 | {`[1,]`, `[1]`}, |
| 45 | {`[1, 2]`, `[1, 2]`}, |
| 46 | {`[2 * x for x in [1, 2, 3]]`, `[2, 4, 6]`}, |
| 47 | {`[2 * x for x in [1, 2, 3] if x > 1]`, `[4, 6]`}, |
| 48 | {`[(x, y) for x in [1, 2] for y in [3, 4]]`, |
| 49 | `[(1, 3), (1, 4), (2, 3), (2, 4)]`}, |
| 50 | {`[(x, y) for x in [1, 2] if x == 2 for y in [3, 4]]`, |
| 51 | `[(2, 3), (2, 4)]`}, |
| 52 | // tuples |
| 53 | {`()`, `()`}, |
| 54 | {`(1)`, `1`}, |
| 55 | {`(1,)`, `(1,)`}, |
| 56 | {`(1, 2)`, `(1, 2)`}, |
| 57 | {`(1, 2, 3, 4, 5)`, `(1, 2, 3, 4, 5)`}, |
| 58 | // dicts |
| 59 | {`{}`, `{}`}, |
| 60 | {`{"a": 1}`, `{"a": 1}`}, |
| 61 | {`{"a": 1,}`, `{"a": 1}`}, |
| 62 | |
| 63 | // conditional |
| 64 | {`1 if 3 > 2 else 0`, `1`}, |
| 65 | {`1 if "foo" else 0`, `1`}, |
| 66 | {`1 if "" else 0`, `0`}, |
| 67 | |
| 68 | // indexing |
| 69 | {`["a", "b"][0]`, `"a"`}, |
| 70 | {`["a", "b"][1]`, `"b"`}, |
| 71 | {`("a", "b")[0]`, `"a"`}, |
| 72 | {`("a", "b")[1]`, `"b"`}, |
| 73 | {`"aΩb"[0]`, `"a"`}, |
| 74 | {`"aΩb"[1]`, `"\xce"`}, |
| 75 | {`"aΩb"[3]`, `"b"`}, |
| 76 | {`{"a": 1}["a"]`, `1`}, |
| 77 | {`{"a": 1}["b"]`, `key "b" not in dict`}, |
| 78 | {`{}[[]]`, `unhashable type: list`}, |
| 79 | {`{"a": 1}[[]]`, `unhashable type: list`}, |
| 80 | {`[x for x in range(3)]`, "[0, 1, 2]"}, |
| 81 | } { |
| 82 | var got string |
| 83 | if v, err := skylark.Eval(thread, "<expr>", test.src, nil); err != nil { |
| 84 | got = err.Error() |
| 85 | } else { |
| 86 | got = v.String() |
| 87 | } |
| 88 | if got != test.want { |
| 89 | t.Errorf("eval %s = %s, want %s", test.src, got, test.want) |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | func TestExecFile(t *testing.T) { |
| 95 | testdata := skylarktest.DataFile("skylark", ".") |
| 96 | thread := &skylark.Thread{Load: load} |
| 97 | skylarktest.SetReporter(thread, t) |
| 98 | for _, file := range []string{ |
| 99 | "testdata/assign.sky", |
| 100 | "testdata/bool.sky", |
| 101 | "testdata/builtins.sky", |
| 102 | "testdata/control.sky", |
| 103 | "testdata/dict.sky", |
| 104 | "testdata/float.sky", |
| 105 | "testdata/function.sky", |
| 106 | "testdata/int.sky", |
| 107 | "testdata/list.sky", |
| 108 | "testdata/misc.sky", |
| 109 | "testdata/set.sky", |
| 110 | "testdata/string.sky", |
| 111 | "testdata/tuple.sky", |
| 112 | } { |
| 113 | filename := filepath.Join(testdata, file) |
| 114 | for _, chunk := range chunkedfile.Read(filename, t) { |
| 115 | globals := skylark.StringDict{ |
| 116 | "hasfields": skylark.NewBuiltin("hasfields", newHasFields), |
| 117 | "fibonacci": fib{}, |
| 118 | } |
| 119 | err := skylark.ExecFile(thread, filename, chunk.Source, globals) |
| 120 | switch err := err.(type) { |
| 121 | case *skylark.EvalError: |
| 122 | found := false |
| 123 | for _, fr := range err.Stack() { |
| 124 | posn := fr.Position() |
| 125 | if posn.Filename() == filename { |
| 126 | chunk.GotError(int(posn.Line), err.Error()) |
| 127 | found = true |
| 128 | break |
| 129 | } |
| 130 | } |
| 131 | if !found { |
| 132 | t.Error(err.Backtrace()) |
| 133 | } |
| 134 | case nil: |
| 135 | // success |
| 136 | default: |
| 137 | t.Error(err) |
| 138 | } |
| 139 | chunk.Done() |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | // A fib is an iterable value representing the infinite Fibonacci sequence. |
| 145 | type fib struct{} |
| 146 | |
| 147 | func (t fib) Freeze() {} |
| 148 | func (t fib) String() string { return "fib" } |
| 149 | func (t fib) Type() string { return "fib" } |
| 150 | func (t fib) Truth() skylark.Bool { return true } |
| 151 | func (t fib) Hash() (uint32, error) { return 0, fmt.Errorf("fib is unhashable") } |
| 152 | func (t fib) Iterate() skylark.Iterator { return &fibIterator{0, 1} } |
| 153 | |
| 154 | type fibIterator struct{ x, y int } |
| 155 | |
| 156 | func (it *fibIterator) Next(p *skylark.Value) bool { |
| 157 | *p = skylark.MakeInt(it.x) |
| 158 | it.x, it.y = it.y, it.x+it.y |
| 159 | return true |
| 160 | } |
| 161 | func (it *fibIterator) Done() {} |
| 162 | |
| 163 | // load implements the 'load' operation as used in the evaluator tests. |
| 164 | func load(thread *skylark.Thread, module string) (skylark.StringDict, error) { |
| 165 | if module == "assert.sky" { |
| 166 | return skylarktest.LoadAssertModule() |
| 167 | } |
| 168 | |
| 169 | // TODO(adonovan): test load() using this execution path. |
| 170 | globals := make(skylark.StringDict) |
| 171 | filename := filepath.Join(filepath.Dir(thread.Caller().Position().Filename()), module) |
| 172 | err := skylark.ExecFile(thread, filename, nil, globals) |
| 173 | return globals, err |
| 174 | } |
| 175 | |
| 176 | func newHasFields(thread *skylark.Thread, _ *skylark.Builtin, args skylark.Tuple, kwargs []skylark.Tuple) (skylark.Value, error) { |
| 177 | return &hasfields{attrs: make(map[string]skylark.Value)}, nil |
| 178 | } |
| 179 | |
| 180 | // hasfields is a test-only implementation of HasAttrs. |
| 181 | // It permits any field to be set. |
| 182 | // Clients will likely want to provide their own implementation, |
| 183 | // so we don't have any public implementation. |
| 184 | type hasfields struct { |
| 185 | attrs skylark.StringDict |
| 186 | frozen bool |
| 187 | } |
| 188 | |
| 189 | var _ skylark.HasAttrs = (*hasfields)(nil) |
| 190 | |
| 191 | func (hf *hasfields) String() string { return "hasfields" } |
| 192 | func (hf *hasfields) Type() string { return "hasfields" } |
| 193 | func (hf *hasfields) Truth() skylark.Bool { return true } |
| 194 | func (hf *hasfields) Hash() (uint32, error) { return 42, nil } |
| 195 | |
| 196 | func (hf *hasfields) Freeze() { |
| 197 | if !hf.frozen { |
| 198 | hf.frozen = true |
| 199 | for _, v := range hf.attrs { |
| 200 | v.Freeze() |
| 201 | } |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | func (hf *hasfields) Attr(name string) (skylark.Value, error) { return hf.attrs[name], nil } |
| 206 | |
| 207 | func (hf *hasfields) SetField(name string, val skylark.Value) error { |
| 208 | if hf.frozen { |
| 209 | return fmt.Errorf("cannot set field on a frozen hasfields") |
| 210 | } |
| 211 | hf.attrs[name] = val |
| 212 | return nil |
| 213 | } |
| 214 | |
| 215 | func (hf *hasfields) AttrNames() []string { |
| 216 | names := make([]string, 0, len(hf.attrs)) |
| 217 | for key := range hf.attrs { |
| 218 | names = append(names, key) |
| 219 | } |
| 220 | return names |
| 221 | } |
| 222 | |
| 223 | func TestParameterPassing(t *testing.T) { |
| 224 | const filename = "parameters.go" |
| 225 | const src = ` |
| 226 | def a(): |
| 227 | return |
| 228 | def b(a, b): |
| 229 | return a, b |
| 230 | def c(a, b=42): |
| 231 | return a, b |
| 232 | def d(*args): |
| 233 | return args |
| 234 | def e(**kwargs): |
| 235 | return kwargs |
| 236 | def f(a, b=42, *args, **kwargs): |
| 237 | return a, b, args, kwargs |
| 238 | ` |
| 239 | |
| 240 | thread := new(skylark.Thread) |
| 241 | globals := make(skylark.StringDict) |
| 242 | if err := skylark.ExecFile(thread, filename, src, globals); err != nil { |
| 243 | t.Fatal(err) |
| 244 | } |
| 245 | |
| 246 | for _, test := range []struct{ src, want string }{ |
| 247 | {`a()`, `None`}, |
| 248 | {`a(1)`, `function a takes no arguments (1 given)`}, |
| 249 | {`b()`, `function b takes exactly 2 arguments (0 given)`}, |
| 250 | {`b(1)`, `function b takes exactly 2 arguments (1 given)`}, |
| 251 | {`b(1, 2)`, `(1, 2)`}, |
| 252 | {`b`, `<function b>`}, // asserts that b's parameter b was treated as a local variable |
| 253 | {`b(1, 2, 3)`, `function b takes exactly 2 arguments (3 given)`}, |
| 254 | {`b(1, b=2)`, `(1, 2)`}, |
| 255 | {`b(1, a=2)`, `function b got multiple values for keyword argument "a"`}, |
| 256 | {`b(1, x=2)`, `function b got an unexpected keyword argument "x"`}, |
| 257 | {`b(a=1, b=2)`, `(1, 2)`}, |
| 258 | {`b(b=1, a=2)`, `(2, 1)`}, |
| 259 | {`b(b=1, a=2, x=1)`, `function b got an unexpected keyword argument "x"`}, |
| 260 | {`b(x=1, b=1, a=2)`, `function b got an unexpected keyword argument "x"`}, |
| 261 | {`c()`, `function c takes at least 1 argument (0 given)`}, |
| 262 | {`c(1)`, `(1, 42)`}, |
| 263 | {`c(1, 2)`, `(1, 2)`}, |
| 264 | {`c(1, 2, 3)`, `function c takes at most 2 arguments (3 given)`}, |
| 265 | {`c(1, b=2)`, `(1, 2)`}, |
| 266 | {`c(1, a=2)`, `function c got multiple values for keyword argument "a"`}, |
| 267 | {`c(a=1, b=2)`, `(1, 2)`}, |
| 268 | {`c(b=1, a=2)`, `(2, 1)`}, |
| 269 | {`d()`, `()`}, |
| 270 | {`d(1)`, `(1,)`}, |
| 271 | {`d(1, 2)`, `(1, 2)`}, |
| 272 | {`d(1, 2, k=3)`, `function d got an unexpected keyword argument "k"`}, |
| 273 | {`d(args=[])`, `function d got an unexpected keyword argument "args"`}, |
| 274 | {`e()`, `{}`}, |
| 275 | {`e(1)`, `function e takes exactly 0 arguments (1 given)`}, |
| 276 | {`e(k=1)`, `{"k": 1}`}, |
| 277 | {`e(kwargs={})`, `{"kwargs": {}}`}, |
| 278 | {`f()`, `function f takes at least 1 argument (0 given)`}, |
| 279 | {`f(0)`, `(0, 42, (), {})`}, |
| 280 | {`f(0)`, `(0, 42, (), {})`}, |
| 281 | {`f(0, 1)`, `(0, 1, (), {})`}, |
| 282 | {`f(0, 1, 2)`, `(0, 1, (2,), {})`}, |
| 283 | {`f(0, 1, 2, 3)`, `(0, 1, (2, 3), {})`}, |
| 284 | {`f(a=0)`, `(0, 42, (), {})`}, |
| 285 | {`f(0, b=1)`, `(0, 1, (), {})`}, |
| 286 | {`f(0, a=1)`, `function f got multiple values for keyword argument "a"`}, |
| 287 | {`f(0, b=1, c=2)`, `(0, 1, (), {"c": 2})`}, |
| 288 | } { |
| 289 | var got string |
| 290 | if v, err := skylark.Eval(thread, "<expr>", test.src, globals); err != nil { |
| 291 | got = err.Error() |
| 292 | } else { |
| 293 | got = v.String() |
| 294 | } |
| 295 | if got != test.want { |
| 296 | t.Errorf("eval %s = %s, want %s", test.src, got, test.want) |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | // TestPrint ensures that the Skylark print function calls |
| 302 | // Thread.Print, if provided. |
| 303 | func TestPrint(t *testing.T) { |
| 304 | const src = ` |
| 305 | print("hello") |
| 306 | def f(): print("world") |
| 307 | f() |
| 308 | ` |
| 309 | buf := new(bytes.Buffer) |
| 310 | print := func(thread *skylark.Thread, msg string) { |
| 311 | caller := thread.Caller() |
| 312 | name := "<module>" |
| 313 | if caller.Function() != nil { |
| 314 | name = caller.Function().Name() |
| 315 | } |
| 316 | fmt.Fprintf(buf, "%s: %s: %s\n", caller.Position(), name, msg) |
| 317 | } |
| 318 | thread := &skylark.Thread{Print: print} |
| 319 | globals := make(skylark.StringDict) |
| 320 | if err := skylark.ExecFile(thread, "foo.go", src, globals); err != nil { |
| 321 | t.Fatal(err) |
| 322 | } |
| 323 | want := "foo.go:2:6: <module>: hello\n" + |
| 324 | "foo.go:3:15: f: world\n" |
| 325 | if got := buf.String(); got != want { |
| 326 | t.Errorf("output was %s, want %s", got, want) |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | func Benchmark(b *testing.B) { |
| 331 | testdata := skylarktest.DataFile("skylark", ".") |
| 332 | thread := new(skylark.Thread) |
| 333 | for _, file := range []string{ |
| 334 | "testdata/benchmark.sky", |
| 335 | // ... |
| 336 | } { |
| 337 | filename := filepath.Join(testdata, file) |
| 338 | |
| 339 | // Evaluate the file once. |
| 340 | globals := make(skylark.StringDict) |
| 341 | if err := skylark.ExecFile(thread, filename, nil, globals); err != nil { |
| 342 | reportEvalError(b, err) |
| 343 | } |
| 344 | |
| 345 | // Repeatedly call each global function named bench_* as a benchmark. |
| 346 | for name, value := range globals { |
| 347 | if fn, ok := value.(*skylark.Function); ok && strings.HasPrefix(name, "bench_") { |
| 348 | b.Run(name, func(b *testing.B) { |
| 349 | for i := 0; i < b.N; i++ { |
| 350 | _, err := skylark.Call(thread, fn, nil, nil) |
| 351 | if err != nil { |
| 352 | reportEvalError(b, err) |
| 353 | } |
| 354 | } |
| 355 | }) |
| 356 | } |
| 357 | } |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | func reportEvalError(tb testing.TB, err error) { |
| 362 | if err, ok := err.(*skylark.EvalError); ok { |
| 363 | tb.Fatal(err.Backtrace()) |
| 364 | } |
| 365 | tb.Fatal(err) |
| 366 | } |
| 367 | |
| 368 | // TestInt exercises the Int.Int64 and Int.Uint64 methods. |
| 369 | // If we can move their logic into math/big, delete this test. |
| 370 | func TestInt(t *testing.T) { |
| 371 | one := skylark.MakeInt(1) |
| 372 | |
| 373 | for _, test := range []struct { |
| 374 | i skylark.Int |
| 375 | wantInt64 string |
| 376 | wantUint64 string |
| 377 | }{ |
| 378 | {skylark.MakeInt64(math.MinInt64).Sub(one), "error", "error"}, |
| 379 | {skylark.MakeInt64(math.MinInt64), "-9223372036854775808", "error"}, |
| 380 | {skylark.MakeInt64(-1), "-1", "error"}, |
| 381 | {skylark.MakeInt64(0), "0", "0"}, |
| 382 | {skylark.MakeInt64(1), "1", "1"}, |
| 383 | {skylark.MakeInt64(math.MaxInt64), "9223372036854775807", "9223372036854775807"}, |
| 384 | {skylark.MakeUint64(math.MaxUint64), "error", "18446744073709551615"}, |
| 385 | {skylark.MakeUint64(math.MaxUint64).Add(one), "error", "error"}, |
| 386 | } { |
| 387 | gotInt64, gotUint64 := "error", "error" |
| 388 | if i, ok := test.i.Int64(); ok { |
| 389 | gotInt64 = fmt.Sprint(i) |
| 390 | } |
| 391 | if u, ok := test.i.Uint64(); ok { |
| 392 | gotUint64 = fmt.Sprint(u) |
| 393 | } |
| 394 | if gotInt64 != test.wantInt64 { |
| 395 | t.Errorf("(%s).Int64() = %s, want %s", test.i, gotInt64, test.wantInt64) |
| 396 | } |
| 397 | if gotUint64 != test.wantUint64 { |
| 398 | t.Errorf("(%s).Uint64() = %s, want %s", test.i, gotUint64, test.wantUint64) |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | func TestBacktrace(t *testing.T) { |
| 404 | // This test ensures continuity of the stack of active Skylark |
| 405 | // functions, including propagation through built-ins such as 'min' |
| 406 | // (though min does not itself appear in the stack). |
| 407 | const src = ` |
| 408 | def f(x): return 1//x |
| 409 | def g(x): f(x) |
| 410 | def h(): return min([1, 2, 0], key=g) |
| 411 | def i(): return h() |
| 412 | i() |
| 413 | ` |
| 414 | thread := new(skylark.Thread) |
| 415 | globals := make(skylark.StringDict) |
| 416 | err := skylark.ExecFile(thread, "crash.go", src, globals) |
| 417 | switch err := err.(type) { |
| 418 | case *skylark.EvalError: |
| 419 | got := err.Backtrace() |
| 420 | const want = `Traceback (most recent call last): |
| 421 | crash.go:6:2: in <toplevel> |
| 422 | crash.go:5:18: in i |
| 423 | crash.go:4:20: in h |
| 424 | crash.go:3:12: in g |
| 425 | crash.go:2:19: in f |
| 426 | Error: floored division by zero` |
| 427 | if got != want { |
| 428 | t.Errorf("error was %s, want %s", got, want) |
| 429 | } |
| 430 | case nil: |
| 431 | t.Error("ExecFile succeeded unexpectedly") |
| 432 | default: |
| 433 | t.Errorf("ExecFile failed with %v, wanted *EvalError", err) |
| 434 | } |
| 435 | } |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 436 | |
| 437 | // TestRepeatedExec parses and resolves a file syntax tree once then |
| 438 | // executes it repeatedly with different values of its global variables. |
| 439 | func TestRepeatedExec(t *testing.T) { |
Laurent Le Brun | 689fc22 | 2018-02-22 19:37:18 +0100 | [diff] [blame] | 440 | f, err := syntax.Parse("repeat.sky", "y = 2 * x", 0) |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 441 | if err != nil { |
| 442 | t.Fatal(f) // parse error |
| 443 | } |
| 444 | |
| 445 | isPredeclaredGlobal := func(name string) bool { return name == "x" } // x, but not y |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 446 | |
alandonovan | 631f7b5 | 2017-10-11 13:04:47 -0400 | [diff] [blame] | 447 | if err := resolve.File(f, isPredeclaredGlobal, skylark.Universe.Has); err != nil { |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 448 | t.Fatal(err) // resolve error |
| 449 | } |
| 450 | |
| 451 | thread := new(skylark.Thread) |
| 452 | for _, test := range []struct { |
| 453 | x, want skylark.Value |
| 454 | }{ |
| 455 | {x: skylark.MakeInt(42), want: skylark.MakeInt(84)}, |
| 456 | {x: skylark.String("mur"), want: skylark.String("murmur")}, |
| 457 | {x: skylark.Tuple{skylark.None}, want: skylark.Tuple{skylark.None, skylark.None}}, |
| 458 | } { |
| 459 | globals := skylark.StringDict{"x": test.x} |
| 460 | fr := thread.Push(globals, len(f.Locals)) |
| 461 | if err := fr.ExecStmts(f.Stmts); err != nil { |
| 462 | t.Errorf("x=%v: %v", test.x, err) // exec error |
| 463 | } else if eq, err := skylark.Equal(globals["y"], test.want); err != nil { |
Jay Conrod | 7761e75 | 2017-10-11 22:13:56 -0400 | [diff] [blame] | 464 | t.Errorf("x=%v: %v", test.x, err) // comparison error |
Alan Donovan | 7b0e4c3 | 2017-10-09 11:03:36 -0400 | [diff] [blame] | 465 | } else if !eq { |
| 466 | t.Errorf("x=%v: got y=%v, want %v", test.x, globals["y"], test.want) |
| 467 | } |
| 468 | thread.Pop() |
| 469 | } |
| 470 | } |
alandonovan | 04850cb | 2017-10-11 14:16:28 -0400 | [diff] [blame] | 471 | |
| 472 | // TestUnpackUserDefined tests that user-defined |
| 473 | // implementations of skylark.Value may be unpacked. |
| 474 | func TestUnpackUserDefined(t *testing.T) { |
| 475 | // success |
| 476 | want := new(hasfields) |
| 477 | var x *hasfields |
| 478 | if err := skylark.UnpackArgs("unpack", skylark.Tuple{want}, nil, "x", &x); err != nil { |
| 479 | t.Errorf("UnpackArgs failed: %v", err) |
| 480 | } |
| 481 | if x != want { |
| 482 | t.Errorf("for x, got %v, want %v", x, want) |
| 483 | } |
| 484 | |
| 485 | // failure |
| 486 | err := skylark.UnpackArgs("unpack", skylark.Tuple{skylark.MakeInt(42)}, nil, "x", &x) |
| 487 | if want := "unpack: for parameter 1: got int, want hasfields"; fmt.Sprint(err) != want { |
| 488 | t.Errorf("unpack args error = %q, want %q", err, want) |
| 489 | } |
| 490 | } |