Second article
If you need more control over the negative comparison
Custom negative comparators
If you need more control over the negative comparison (the not case) than the simple boolean inversion above, you can also have your matcher factory include another key, negativeCompare alongside compare, for which the value is a function to invoke when .not is used. This function/key is optional.
Register the custom matchers with Jasmine. All properties on the object passed in will be available as custom matchers (e.g., in this case toBeGoofy).
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