A matcher that saves the argument that it is verifying so that your unit test
can perform extra tests with this argument later. For example, if the
argument is a callback method, the unit test can then later call this
callback to test the asynchronous portion of the call.
new SaveArgument( opt_matcher, opt_matchName )
| Parameters | | opt_matcher | (goog.testing.mockmatchers.ArgumentMatcher|Function|null)= | | Argument matcher or matching function that will be used to validate the
argument. By default, argument will always be valid.
| | opt_matchName | (string|null)= | | The name expressing intent as part of
an error message for when a match fails.
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