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Fix ngMock window.inject() stack trace reporting on PhanthomJS for 1.4.x branch #13592
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Could this pull request be merged? It's a simple bug-fix, well commented and with relevant tests added. Leaving it hanging here just makes it attract conflicts. 😟 |
Add support for collecting current stack trace information in browsers
(e.g. PhantomJS) that do not automatically store the current stack trace
information in a newly created `Error` object's `stack` property, but
only add it there once the `Error` gets thrown.
The original implementation works fine in Firefox & Chrome, but fails on
PhantomJS where it, for example, breaks karma's error reporting in cases
when an exception for thrown in a test like the following:
```
it('the holy crusade', inject(function () {
var x = {};
x.holyGrail();
}));
```
where the ngMock `inject()` implementation would incorrectly add the word
`undefined` to the end of the collected error stack trace information,
thus causing the main error description to be reported back to karma as
`undefined`.
The whole `Error.stack` property and its behaviour is not standardized so
there is no one true implementation that we can assume is used by all
angular compatible browsers.
MSDN JavaScript `stack Property (Error) (JavaScript)` docs found at
http://msdn.microsoft.com/en-us/library/windows/apps/hh699850.aspx also
seem to match the PhantomJS implementation.
Angular's ngMock inject() function, when called outside of a test spec context will not directly call the provided callback but will instead return a wrapper function to call the provided function at a later time, presumably while in some test spec context. And if that is the case, Angular would like to include the information on the inject() calling location to be included in the thrown error's stack trace information, so it manually appends it to the ones included in the actual error's stack trace. The added test makes sure this functionality: - works as expected in browsers supporting JavaScript stack trace collection, e.g. Chrome, Firefox, IE10+, Opera & PhantomJS - does not add any bogus stack track information in browsers that do not support JavaScript stack trace collection, e.g. IE8 or IE9 Closes angular#13591
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Apr 9, 2016
…omJS
Add support for collecting current stack trace information in browsers
(e.g. IE10+, PhantomJS) that do not automatically store the current stack trace
information in a newly created `Error` object's `stack` property, but
only add it there once the `Error` gets thrown.
The original implementation works fine in Firefox & Chrome, but fails on IE10+
and PhantomJS where it, for example, breaks Karma's error reporting in cases
when an exception is thrown in a test like the following:
```
it('the holy crusade', inject(function() {
var x = {};
x.holyGrail();
}));
```
In this case, the ngMock `inject()` implementation would incorrectly add the
word `undefined` at the end of the collected error stack trace information,
thus causing the main error description to be reported back to Karma as
`undefined`.
The added test makes sure this functionality:
- works as expected in browsers supporting JavaScript stack trace
collection, e.g. Chrome, Firefox, IE10+, Opera & PhantomJS
- does not add any bogus stack track information in browsers that do
not support JavaScript stack trace collection, e.g. IE9
Fixes #13591
Closes #13592
Closes #13593
gkalpak
pushed a commit
that referenced
this pull request
Apr 9, 2016
…omJS
Add support for collecting current stack trace information in browsers
(e.g. IE10+, PhantomJS) that do not automatically store the current stack trace
information in a newly created `Error` object's `stack` property, but
only add it there once the `Error` gets thrown.
The original implementation works fine in Firefox & Chrome, but fails on IE10+
and PhantomJS where it, for example, breaks Karma's error reporting in cases
when an exception is thrown in a test like the following:
```
it('the holy crusade', inject(function() {
var x = {};
x.holyGrail();
}));
```
In this case, the ngMock `inject()` implementation would incorrectly add the
word `undefined` at the end of the collected error stack trace information,
thus causing the main error description to be reported back to Karma as
`undefined`.
The added test makes sure this functionality:
- works as expected in browsers supporting JavaScript stack trace
collection, e.g. Chrome, Firefox, IE10+, Opera & PhantomJS
- does not add any bogus stack track information in browsers that do
not support JavaScript stack trace collection, e.g. IE9
Fixes #13591
Closes #13592
Closes #13593
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Fixes & adds a tests for issue #13591 for the angular
1.4.xbranch.This does the same work as pull request #13593 does on the angular
masterbranch.