There are three macros in the clojure.test namespace, which are the trifecta of testing in Clojure: deftest, is, and testing. These three macros are explained as follows:
deftest: This is similar todefordefnand defines our test function. Tests may call other tests, however, this is a practice that I consider dangerous, as it can result in fragile tests that are, by their nature, rather difficult to debug.Usage: (
deftest name & body)is: This is used to make an assertion in our test. The predicate we pass toisshould return a Boolean. We can also optionally provide a message, which will be attached to the assertion and displayed as part of the failure written tostdout.Usage: (
is form)(
is form message)isalso allows the following two special forms that can be used to check for exceptions:thrown?: This is used to ensure that an exception of a specific type is thrown, and if not, fails the test.Usage: (
thrown? e form)Here's an example of this form:
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