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Diffstat (limited to '')
-rw-r--r-- | js/src/tests/test262/built-ins/TypedArray/prototype/findLast/return-undefined-if-predicate-returns-false-value.js | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/findLast/return-undefined-if-predicate-returns-false-value.js b/js/src/tests/test262/built-ins/TypedArray/prototype/findLast/return-undefined-if-predicate-returns-false-value.js new file mode 100644 index 0000000000..313915e115 --- /dev/null +++ b/js/src/tests/test262/built-ins/TypedArray/prototype/findLast/return-undefined-if-predicate-returns-false-value.js @@ -0,0 +1,51 @@ +// Copyright (C) 2021 Microsoft. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-%typedarray%.prototype.findlast +description: > + Return undefined if predicate always returns a boolean false value. +info: | + %TypedArray%.prototype.findLast (predicate [ , thisArg ] ) + + ... + 6. 6. Repeat, while k ≥ 0 + ... + c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)). + ... + 7. Return undefined. +includes: [testTypedArray.js] +features: [Symbol, TypedArray, array-find-from-last] +---*/ + +testWithTypedArrayConstructors(function(TA) { + var sample = new TA(3); + var called = 0; + + var result = sample.findLast(function() { + called++; + return false; + }); + + assert.sameValue(called, 3, "predicate was called three times"); + assert.sameValue(result, undefined); + + result = sample.findLast(function() { return ""; }); + assert.sameValue(result, undefined, "ToBoolean(empty string)"); + + result = sample.findLast(function() { return undefined; }); + assert.sameValue(result, undefined, "ToBoolean(undefined)"); + + result = sample.findLast(function() { return null; }); + assert.sameValue(result, undefined, "ToBoolean(null)"); + + result = sample.findLast(function() { return 0; }); + assert.sameValue(result, undefined, "ToBoolean(0)"); + + result = sample.findLast(function() { return -0; }); + assert.sameValue(result, undefined, "ToBoolean(-0)"); + + result = sample.findLast(function() { return NaN; }); + assert.sameValue(result, undefined, "ToBoolean(NaN)"); +}); + +reportCompare(0, 0); |