Java - contract tests

Question

I am trying to write contract tests for some widely used interfaces:

Along the lines of:

public abstract class MyInterfaceContractTest extends TestCase {         


        

Answer 1

Generally the approach would be to use a "testable" subclass of the abstract class to test all the functionality of the abstract class in one test. Then write a separate test for each concrete implementation testing just the methods defined / implemented in the concrete class (don't retest the functionality in the concrete class).