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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js b/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js new file mode 100644 index 0000000000..0c64e02017 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js @@ -0,0 +1,40 @@ +// 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-array.prototype.concat +description: > + An undefined value for the @@species constructor triggers the creation of + an Array exotic object +info: | + [...] + 9. Let A be ? ArraySpeciesCreate(O, actualDeleteCount). + [...] + + 9.4.2.3 ArraySpeciesCreate + + [...] + 5. Let C be ? Get(originalArray, "constructor"). + [...] + 7. If Type(C) is Object, then + a. Let C be ? Get(C, @@species). + b. If C is null, let C be undefined. + 8. If C is undefined, return ? ArrayCreate(length). +features: [Symbol.species] +---*/ + +var a = []; +var result; + +a.constructor = {}; +a.constructor[Symbol.species] = undefined; + +result = a.concat(); + +assert.sameValue( + Object.getPrototypeOf(result), + Array.prototype, + 'Object.getPrototypeOf(a.concat()) returns Array.prototype' +); +assert(Array.isArray(result), 'Array.isArray(result) must return true'); + +reportCompare(0, 0); |