We've already been using Easymock extensively for quite some time, but the new JSR 352 integration added usages of Mockito in some tests.
Let's not use multiple tools for the same task: we should convert those tests to use Easymock.

We chose Easymock over Mockito because:

• it is already used in more tests
• Mockito would require an upgrade in order to work with JDK9