For last couple of years a small but very useful set of utility methods has been created for performing various assertions:
assertThrows assertHasOnlyElements assertContains assertNotEquals etc.
Not only it simplifies your unit testing, but also encourages to prepare correct equals() and readable toString() methods. Most of assertions are generics-aware. The library requires Java 1.5+.
Use Patent Claims
These details are provided for information only. No information here is legal advice and should not be used as such.