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