To run tests from the Prolog prompt, first load the program and then 
run run_tests/0 
or run_tests(+Unit).
- run_tests
- Run all test-units.
- run_tests(+Spec)
- Run only the specified tests. Spec can be a list to run 
multiple tests. A single specification is either the name of a test unit 
or a term <Unit>:<Tests>, running only 
the specified test. <Tests> is either the name of a 
test or a list of names. Running particular tests is particularly useful 
for tracing a test:5Unfortunately 
the body of the test is called through meta-calling, so it cannot be 
traced. The called user-code can be traced normally though.
?- gtrace, run_tests(lists:member). 
 
To identify nonterminating tests, interrupt the looping process with
Control-C. The test name and location will be displayed.