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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-proxy.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-proxy.js | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-proxy.js b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-proxy.js new file mode 100644 index 0000000000..52dde72e68 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-proxy.js @@ -0,0 +1,53 @@ +// Copyright (C) 2016 the V8 project authors. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-isconcatspreadable +description: > + Proxies who final targets are arrays are considered spreadable +info: | + [...] + 5. Repeat, while items is not empty + a. Remove the first element from items and let E be the value of the + element. + b. Let spreadable be ? IsConcatSpreadable(E). + c. If spreadable is true, then + [...] + e. Else E is added as a single item rather than spread, + [...] + + ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O ) + + 1. If Type(O) is not Object, return false. + 2. Let spreadable be ? Get(O, @@isConcatSpreadable). + 3. If spreadable is not undefined, return ToBoolean(spreadable). + 4. Return ? IsArray(O). + + 7.2.2 IsArray + + [...] + 3. If argument is a Proxy exotic object, then + a. If the value of the [[ProxyHandler]] internal slot of argument is null, + throw a TypeError exception. + b. Let target be the value of the [[ProxyTarget]] internal slot of + argument. + c. Return ? IsArray(target). +features: [Proxy, Symbol.isConcatSpreadable] +---*/ + +var arrayProxy = new Proxy([], {}); +var arrayProxyProxy = new Proxy(arrayProxy, {}); +var spreadable = {}; +spreadable[Symbol.isConcatSpreadable] = true; +var spreadableProxy = new Proxy(spreadable, {}); + +assert.sameValue([].concat(arrayProxy).length, 0, 'The value of [].concat(arrayProxy).length is expected to be 0'); +assert.sameValue( + [].concat(arrayProxyProxy).length, 0, 'The value of [].concat(arrayProxyProxy).length is expected to be 0' +); +assert.sameValue( + [].concat(spreadableProxy).length, + 0, + 'The value of [].concat(spreadableProxy).length is expected to be 0' +); + +reportCompare(0, 0); |