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Diffstat (limited to 'js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js')
-rw-r--r-- | js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js new file mode 100644 index 0000000000..c21efdad18 --- /dev/null +++ b/js/src/tests/test262/built-ins/String/prototype/trimStart/this-value-object-toprimitive-meth-priority.js @@ -0,0 +1,82 @@ +// Copyright (C) 2017 Valerie Young. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +esid: sec-string.prototype.trimStart +description: > + Priority of Symbol[toPrimitive] when converting object to string for trimming +info: | + Runtime Semantics: TrimString ( string, where ) + 1. Let str be ? RequireObjectCoercible(string). + 2. Let S be ? ToString(str). + ... + + ToString ( argument ) + If argument is Object: + 1. Let primValue be ? ToPrimitive(argument, hint String). + ... + + ToPrimitive ( input [, PreferredType ]) + ... + d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive) + e. If exoticToPrim is not undefined, then + i. Let result be ? Call(exoticToPrim, input, « hint »). + ii. If Type(result) is not Object, return result. + ... +features: [string-trimming, String.prototype.trimStart, Symbol.toPrimitive] +---*/ + + +var toPrimitiveAccessed = 0; +var toStringAccessed = 0; +var valueOfAccessed = 0; +var thisVal = { + get [Symbol.toPrimitive]() { + toPrimitiveAccessed += 1; + return function() { + return ' 42'; + }; + }, + get toString() { + toStringAccessed += 1; + return function() { + return ''; + }; + }, + get valueOf() { + valueOfAccessed += 1; + return function() { + return ''; + }; + }, +}; + +// Test that thisVal[Symbol.toPrimitive] has been called. + +var result = String.prototype.trimStart.call(thisVal); + +assert.sameValue( + toPrimitiveAccessed, + 1, + 'thisVal[Symbol.toPrimitive] expected to have been accessed.' +); +assert.sameValue( + result, + '42', + 'thisVal[Symbol.toPrimitive] expected to have been called.' +); + +// Test that thisVal.toString and thisVal.valueOf have not been accessedo + +assert.sameValue( + toStringAccessed, + 0, + 'thisVal.toString should not have been accessed.' +); +assert.sameValue( + valueOfAccessed, + 0, + 'thisVal.valueOf should not have been accessed.' +); + +reportCompare(0, 0); |