BUG - AssertJ causing long compile times

[andricDu]

AssertJ was identified as causing long test compile times.

Description

Currently AssertJ has been the cause of long compile times for the tests. I removed a lot of it from our existing code and it alleviated the issue a lot. We should make the effort to remove it from the rest of the tests.

Expected Behaviour

mvn test-compile should not take a long time

Actual Behaviour

mvn test-compile takes longer than it should

Possible Fix

replace AssertJ.assertThat calls with just the basic Junit.assertEquals and the like.

Steps to Reproduce

Run mvn test-compile

Your Environment

JDK11 Mac and Linux

[jaserud]

This has been resolved in #377