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Add tests for object to primitive returns object errors
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Valerie R Young
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Oct 4, 2017
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.../built-ins/String/prototype/trimStart/this-value-object-toprimitive-returns-object-err.js
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// Copyright (C) 2017 Valerie Young. All rights reserved. | ||
// This code is governed by the BSD license found in the LICENSE file. | ||
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/*--- | ||
esid: sec-string.prototype.trimStart | ||
description: > | ||
Abrupt completion when Symbol.toPrimitive returns an object | ||
info: | | ||
Runtime Semantics: TrimString ( string, where ) | ||
1. Let str be ? RequireObjectCoercible(string). | ||
2. Let S be ? ToString(str). | ||
... | ||
ToString ( argument ) | ||
If arguement 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. | ||
iii. Throw a TypeError exception. | ||
... | ||
features: [string-trimming, Symbol.toPrimitive] | ||
---*/ | ||
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var thisVal = { | ||
[Symbol.toPrimitive]: function() { | ||
return {}; | ||
}, | ||
}; | ||
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assert.throws(TypeError, function() { | ||
String.prototype.trimStart.call(thisVal); | ||
}); |
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test/built-ins/String/prototype/trimStart/this-value-object-tostring-returns-object-err.js
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// 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: > | ||
Abrupt completion when toString called and returns an object | ||
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 ]) | ||
... | ||
b. Else if PreferredType is hint String, let hint be "string". | ||
... | ||
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. | ||
iii. Throw a TypeError exception. | ||
f. If hint is "default", set hint to "number". | ||
g. Return ? OrdinaryToPrimitive(input, hint). | ||
... | ||
OrdinaryToPrimitive( O, hint ) | ||
... | ||
3. If hint is "string", then | ||
a. Let methodNames be « "toString", "valueOf" ». | ||
... | ||
5. For each name in methodNames in List order, do | ||
a. Let method be ? Get(O, name). | ||
b. If IsCallable(method) is true, then | ||
i. Let result be ? Call(method, O). | ||
ii. If Type(result) is not Object, return result. | ||
6. Throw a TypeError exception. | ||
features: [string-trimming, Symbol.toPrimitive] | ||
---*/ | ||
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var thisVal = { | ||
[Symbol.toPrimitive]: undefined, | ||
toString: function() { | ||
return {}; | ||
}, | ||
}; | ||
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assert.throws(TypeError, function() { | ||
String.prototype.trimStart.call(thisVal); | ||
}); |
57 changes: 57 additions & 0 deletions
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test/built-ins/String/prototype/trimStart/this-value-object-valueof-returns-object-err.js
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// 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: > | ||
Abrupt completion when valueOf called and returns an object | ||
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 ]) | ||
... | ||
b. Else if PreferredType is hint String, let hint be "string". | ||
... | ||
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. | ||
iii. Throw a TypeError exception. | ||
f. If hint is "default", set hint to "number". | ||
g. Return ? OrdinaryToPrimitive(input, hint). | ||
... | ||
OrdinaryToPrimitive( O, hint ) | ||
... | ||
3. If hint is "string", then | ||
a. Let methodNames be « "toString", "valueOf" ». | ||
... | ||
5. For each name in methodNames in List order, do | ||
a. Let method be ? Get(O, name). | ||
b. If IsCallable(method) is true, then | ||
i. Let result be ? Call(method, O). | ||
ii. If Type(result) is not Object, return result. | ||
6. Throw a TypeError exception. | ||
features: [string-trimming, Symbol.toPrimitive] | ||
---*/ | ||
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var thisVal = { | ||
[Symbol.toPrimitive]: undefined, | ||
toString: undefined, | ||
valueOf: function() { | ||
return {}; | ||
}, | ||
}; | ||
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assert.throws(TypeError, function() { | ||
String.prototype.trimStart.call(thisVal); | ||
}); |