Editing HUnit 1.0 User's Guide (section)

=== Test Case ===

A ''test case'' is the unit of test execution. That is, distinct test cases are executed independently. The failure of one is independent of the failure of any other.

A test case consists of a single, possibly collective, assertion. The possibly multiple constituent assertions in a test case's collective assertion are ''not'' independent.  Their interdependence may be crucial to specifying correct operation for a test. A test case may involve a series of steps, each concluding in an assertion, where each step must succeed in order for the test case to continue. As another example, a test may require some "set up" to be performed that must be undone ("torn down" in JUnit parlance) once the test is complete. In this case, you could use Haskell's <code>IO.bracket</code> function to achieve the desired effect.

You can make a test case from an assertion by applying the <code>TestCase</code> constructor. For example, <code>(TestCase&nbsp;(return&nbsp;()))</code> is a test case that never fails, and <code>(TestCase&nbsp;assertEqual&nbsp;"for&nbsp;x,"&nbsp;3&nbsp;x))</code> is a test case that checks that the value of <code>x</code> is 3. Additional ways to create test cases are described later under [[#Advanced Features | Advanced Features]].