04ba28f5a4
git-svn-id: http://svn.openlayers.org/trunk/openlayers@11 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
84 lines
2.6 KiB
JavaScript
84 lines
2.6 KiB
JavaScript
/*
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throws.js -- Adds a `throws_` method to AnotherWay test objects.
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Copyright 2005 MetaCarta, Inc., released under the BSD License.
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A reference to this file needs to be added to `run-tests.html` in the
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head element after the AnotherWay classes are created:
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<script type="text/javascript" src="throws.js"></script>
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Then, it can be used just like the `ok`, `fail` and other such methods
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in your unit tests.
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e.g.
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t.throws_(function () {new OpenLayers.View.Map.Dynamic();},
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ReferenceError("No container supplied."),
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"OpenLayers.View.Map.Dynamic instantiation with no container "
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+ "must throw.");
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This was inspired by the `assertRaises` method of Python's unittest
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library.
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Possible future enhancements:
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* Contribute to official AnotherWay distribution.
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* Use `apply` rather than require a inner function (or as an option).
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* Preserve the stack fields.
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*/
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Test.AnotherWay._test_object_t.prototype.throws_ =
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function (fn, expectedException, doc) {
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/*
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Executes the supplied function object catching any exception(s)
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thrown, then verifies the supplied expected exception occurred.
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If no exception is thrown the test fails.
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If an exception is thrown and it does not match the supplied
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expected exception the test fails.
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If the exception thrown matches the supplied expected exception
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the test passes.
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Two exceptions "match" if Test.AnotherWay's `eq` method considers
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the two equal when their respective stacks are ignored.
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fn - The function object to be executed
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expectedException - The exception object expected to result
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doc - Description of the test
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Note: The name of this method is `throws_` (with a trailing
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underscore) as `throws` is a reserved identifier and can
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not be used as a method name.
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Note: This function does not preserve the stack field associated
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with either exception.
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*/
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var theCaughtException = null;
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try {
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fn();
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} catch (innerCaughtException) {
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// As `innerCaughtException` is not visible outside the scope
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// of this `catch` block we need to make it visible explicitly.
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theCaughtException = innerCaughtException;
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}
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if (theCaughtException) {
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// We delete the stacks before comparison as they will never match.
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delete theCaughtException.stack;
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delete expectedException.stack;
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this.eq(theCaughtException, expectedException, doc);
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} else {
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this.fail(doc);
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}
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}
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