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author | janekptacijarabaci <janekptacijarabaci@seznam.cz> | 2018-03-27 15:57:18 +0200 |
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committer | janekptacijarabaci <janekptacijarabaci@seznam.cz> | 2018-03-27 15:57:18 +0200 |
commit | d990d8ab2cade6c928e8bbe56ae038d020cef599 (patch) | |
tree | c7561ae0f303cb0d4a7a7507178531b4852e4dea /js/src/tests/ecma_6/Generators/yield-iterator-close.js | |
parent | 0c36b27511c1fbca594f0426c493ef601fda3e4c (diff) | |
parent | 8d5ec757ece850fb7ad5c712868f305636e41177 (diff) | |
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Merge branch 'master' of https://github.com/MoonchildProductions/UXP into js_array_values_1
Diffstat (limited to 'js/src/tests/ecma_6/Generators/yield-iterator-close.js')
-rw-r--r-- | js/src/tests/ecma_6/Generators/yield-iterator-close.js | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/js/src/tests/ecma_6/Generators/yield-iterator-close.js b/js/src/tests/ecma_6/Generators/yield-iterator-close.js new file mode 100644 index 000000000..970ad494d --- /dev/null +++ b/js/src/tests/ecma_6/Generators/yield-iterator-close.js @@ -0,0 +1,58 @@ +// Test that IteratorClose is called when a Generator is abruptly completed by +// Generator.return. + +var returnCalled = 0; +function* wrapNoThrow() { + let iter = { + [Symbol.iterator]() { + return this; + }, + next() { + return { value: 10, done: false }; + }, + return() { + returnCalled++; + return {}; + } + }; + for (const i of iter) { + yield i; + } +} + +// Breaking calls Generator.return, which causes the yield above to resume with +// an abrupt completion of kind "return", which then calls +// iter.return. +for (const i of wrapNoThrow()) { + break; +} +assertEq(returnCalled, 1); + +function* wrapThrow() { + let iter = { + [Symbol.iterator]() { + return this; + }, + next() { + return { value: 10, done: false }; + }, + return() { + throw 42; + } + }; + for (const i of iter) { + yield i; + } +} + +// Breaking calls Generator.return, which, like above, calls iter.return. If +// iter.return throws, since the yield is resuming with an abrupt completion of +// kind "return", the newly thrown value takes precedence over returning. +assertThrowsValue(() => { + for (const i of wrapThrow()) { + break; + } +}, 42); + +if (typeof reportCompare === "function") + reportCompare(0, 0); |