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is (clj)
(source)macro
(is form)
(is form msg)
Generic assertion macro. 'form' is any predicate test.
'msg' is an optional message to attach to the assertion.
Example: (is (= 4 (+ 2 2)) "Two plus two should be 4")
Special forms:
(is (thrown? c body)) checks that an instance of c is thrown from
body, fails if not; then returns the thing thrown.
(is (thrown-with-msg? c re body)) checks that an instance of c is
thrown AND that the message on the exception matches (with
re-find) the regular expression re.