How should one unit test the hashCode-equals contract?

Question

In a nutshell, the hashCode contract, according to Java\'s object.hashCode():

1. The hash code shouldn\'t change unless something affecting equals() changes

Answer 1

You can also use something similar to http://code.google.com/p/guava-libraries/source/browse/guava-testlib/src/com/google/common/testing/EqualsTester.java to test equals and hashCode.