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author | wolfbeast <mcwerewolf@gmail.com> | 2018-03-27 13:21:40 +0200 |
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committer | wolfbeast <mcwerewolf@gmail.com> | 2018-03-27 13:21:40 +0200 |
commit | e19749682050ff716fc9ff3bbc05ee3911570670 (patch) | |
tree | 4213a4e8efdaadea0409642702ec6c499f7b9ccc /js/src/tests/ecma_6/Destructuring/array-iterator-close.js | |
parent | 72721d1d032db2099593076bf96f274623af3c26 (diff) | |
parent | 70c8cf8db71880c1ab1f8fee4787a19316960dac (diff) | |
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Merge remote-tracking branch 'janek/js_IteratorClose_1'
Diffstat (limited to 'js/src/tests/ecma_6/Destructuring/array-iterator-close.js')
-rw-r--r-- | js/src/tests/ecma_6/Destructuring/array-iterator-close.js | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Destructuring/array-iterator-close.js b/js/src/tests/ecma_6/Destructuring/array-iterator-close.js new file mode 100644 index 000000000..ed35135db --- /dev/null +++ b/js/src/tests/ecma_6/Destructuring/array-iterator-close.js @@ -0,0 +1,93 @@ +// Tests that IteratorClose is called in array destructuring patterns. + +function test() { + var returnCalled = 0; + var returnCalledExpected = 0; + var iterable = {}; + + // empty [] calls IteratorClose regardless of "done" on the result. + iterable[Symbol.iterator] = makeIterator({ + next: function() { + return { done: true }; + }, + ret: function() { + returnCalled++; + return {}; + } + }); + var [] = iterable; + assertEq(returnCalled, ++returnCalledExpected); + + iterable[Symbol.iterator] = makeIterator({ + ret: function() { + returnCalled++; + return {}; + } + }); + var [] = iterable; + assertEq(returnCalled, ++returnCalledExpected); + + // Non-empty destructuring calls IteratorClose if iterator is not done by + // the end of destructuring. + var [a,b] = iterable; + assertEq(returnCalled, ++returnCalledExpected); + var [c,] = iterable; + assertEq(returnCalled, ++returnCalledExpected); + + // throw in lhs ref calls IteratorClose + function throwlhs() { + throw "in lhs"; + } + assertThrowsValue(function() { + 0, [...{}[throwlhs()]] = iterable; + }, "in lhs"); + assertEq(returnCalled, ++returnCalledExpected); + + // throw in lhs ref calls IteratorClose with falsy "done". + iterable[Symbol.iterator] = makeIterator({ + next: function() { + // "done" is undefined. + return {}; + }, + ret: function() { + returnCalled++; + return {}; + } + }); + assertThrowsValue(function() { + 0, [...{}[throwlhs()]] = iterable; + }, "in lhs"); + assertEq(returnCalled, ++returnCalledExpected); + + // throw in iter.next doesn't call IteratorClose + iterable[Symbol.iterator] = makeIterator({ + next: function() { + throw "in next"; + }, + ret: function() { + returnCalled++; + return {}; + } + }); + assertThrowsValue(function() { + var [d] = iterable; + }, "in next"); + assertEq(returnCalled, returnCalledExpected); + + // "return" must return an Object. + iterable[Symbol.iterator] = makeIterator({ + ret: function() { + returnCalled++; + return 42; + } + }); + assertThrowsInstanceOf(function() { + var [] = iterable; + }, TypeError); + assertEq(returnCalled, ++returnCalledExpected); +} + +test(); + +if (typeof reportCompare === "function") + reportCompare(0, 0); |