Test.HUnit.Lang

This module abstracts the differences between implementations of Haskell (e.g., GHC, Hugs, and NHC).

Documentation

type Assertion = IO ()

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.

assertFailure

Arguments

:: String

A message that is displayed with the assertion failure

-> Assertion

Unconditionally signals that a failure has occured. All other assertions can be expressed with the form:

    if conditionIsMet 
        then IO () 
        else assertFailure msg

performTestCase

Arguments

:: Assertion

an assertion to be made during the test case run

-> IO (Maybe (Bool, String))

Performs a single test case. The meaning of the result is as follows:

Nothing

test case success

Just (True, msg)

test case failure with the given message

Just (False, msg)

test case error with the given message

Internals

Note: This is not part of the public API! It is exposed so that you can tinker with the internals of HUnit, but do not expect it to be stable!

data HUnitFailure

Constructors

HUnitFailure String

Instances

Show HUnitFailure

Typeable HUnitFailure

Exception HUnitFailure