A simple, one-file implementation of a test framework for Java.

• As small as possible, but no smaller. The entire API surface consists of three annotations: @Test, @Skip and @Timeout().
• Use @Test with any static method to declare the method as a test case. Pass a string to describe the behavior being tested, for example: @Test("should throw exception when passed a negative number")
• Use @Skip on a class or method to temporarily skip test cases. UnitTest.java will display the test case but not run it.
• Use @Timeout(5000) to change the amount of time UnitTest.java will wait for a test case to finish. The default timeout is 2,000 milliseconds (two seconds).

Run UnitTest.java with no command line arguments. It will search the classpath for methods annotated with @Test, run each of them, and print the results. Failures are always printed last. For example:

> java UnitTest
[skip] HeapTest.testRemove (? ms)
[pass] HeapTest.testException (0.05 ms)
[pass] HeapTest.testIsEmpty (0.03 ms)
[fail] HeapTest.testInsert (0.19 ms)
   java.util.NoSuchElementException
   at Heap.remove(Heap.java:75)
4 tests, 1 skipped, 2 passed, 1 failed

A command line argument will limit the search to classes/methods with the given pattern. For example, to run only test cases in the Foobar class, run

> java UnitTest Foobar