- In ArtifactSetVersionTest the method was declared,
but not used at all.
- In MtaUtilsTest there was a particular Object created
for the sole purpose of serving as script.
For that we have the nullScript.
- In DockerArtifactVersioningTest 'this' was configured to
serve as script. There is basically no reason why the
instance of the JUnitTest should serve as script.
Instead we have the nullScript for that purpose.