Checking arguments in function calls with specifications

Instrument functions during development

Instrumenting a function enables the checking of arguments in a function call against the specification defined in an fdef definition of the same name.

(clojure.spec.test.alpha/instrument `function-name)

Instrumenting a function swaps the function definition var with a wrapped version of the function definition which includes tests the :args spec from the fdef expression.

unstrument returns the function definition to the original form and tests for that function are no longer run.

Unit (Specification) testing

You can generate data for interactive testing with gen/sample.