This module abstracts the differences between implementations of Haskell (e.g., GHC, Hugs, and NHC).
When an assertion is evaluated, it will output a message if and only if the assertion fails.
Test cases are composed of a sequence of one or more assertions.
Unconditionally signals that a failure has occured. All other assertions can be expressed with the form:
if conditionIsMet then IO () else assertFailure msg
Performs a single test case. The meaning of the result is as follows:
- test case success
Just (True, msg)
- test case failure with the given message
Just (False, msg)
- test case error with the given message