re-name unnecessary test

[esundbla]

Unnecessary is misleading unless truly is 'unnecessary', we suggest renaming to checkIfNull or checkNotNull!

[jody]

It is unclear what this issue is referring to. Please add some reference.

[esundbla]

In hello world test code https://github.com/jody/helloCS3250/blob/main/src/metrocs/HelloWorldTest.java Lines 34- 37