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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /js/src/tests/ecma_6/Class/innerBinding.js | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/tests/ecma_6/Class/innerBinding.js')
-rw-r--r-- | js/src/tests/ecma_6/Class/innerBinding.js | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Class/innerBinding.js b/js/src/tests/ecma_6/Class/innerBinding.js new file mode 100644 index 000000000..b1afa177e --- /dev/null +++ b/js/src/tests/ecma_6/Class/innerBinding.js @@ -0,0 +1,86 @@ +// Named class definitions should create an immutable inner binding. +// Since all code in classes is in strict mode, attempts to mutate it +// should throw. +class Foof { constructor() { }; tryBreak() { Foof = 4; } } +for (let result of [Foof, class Bar { constructor() { }; tryBreak() { Bar = 4; } }]) + assertThrowsInstanceOf(() => new result().tryBreak(), TypeError); + +{ + class foo { constructor() { }; tryBreak() { foo = 4; } } + for (let result of [foo, class Bar { constructor() { }; tryBreak() { Bar = 4 } }]) + assertThrowsInstanceOf(() => new result().tryBreak(), TypeError); +} + +// TDZ applies to inner bindings +assertThrowsInstanceOf(()=>eval(`class Bar { + constructor() { }; + [Bar] () { }; + }`), ReferenceError); + +assertThrowsInstanceOf(()=>eval(`(class Bar { + constructor() { }; + [Bar] () { }; + })`), ReferenceError); + +// There's no magic "inner binding" global +{ + class Foo { + constructor() { }; + test() { + class Bar { + constructor() { } + test() { return Foo === Bar } + } + return new Bar().test(); + } + } + assertEq(new Foo().test(), false); + assertEq(new class foo { + constructor() { }; + test() { + return new class bar { + constructor() { } + test() { return foo === bar } + }().test(); + } + }().test(), false); +} + +// Inner bindings are shadowable +{ + class Foo { + constructor() { } + test(Foo) { return Foo; } + } + assertEq(new Foo().test(4), 4); + assertEq(new class foo { + constructor() { }; + test(foo) { return foo } + }().test(4), 4); +} + +// Inner bindings in expressions should shadow even existing names. +class Foo { constructor() { } static method() { throw new Error("NO!"); } } +assertEq(new class Foo { + constructor() { }; + static method() { return 4; }; + test() { return Foo.method(); } + }().test(), 4); + +// The outer binding is distinct from the inner one +{ + let orig_X; + + class X { + constructor() { } + f() { assertEq(X, orig_X); } + } + + orig_X = X; + X = 13; + assertEq(X, 13); + new orig_X().f(); +} + +if (typeof reportCompare === "function") + reportCompare(0, 0, "OK"); |