A quick google tuned up this gem, which I have grabbed below:
Open the Preferences via Window -> Preferences and select Java > Editor > Content Assist > Favorites. Add then via "New Member" the methods you need. For example this makes the assertTrue, assertFalse and assertEquals method available.
You can now use Content Assist (Ctrl+Space) to add the method and the import.
He suggests to add at least the following new members.
org.junit.Assert.assertTrue
org.junit.Assert.assertFalse
org.junit.Assert.assertEquals
- org.junit.Assert.fail
I suggest also adding
- org.junit.Assert.assertNotNull