Improve NodeParameterValue and LabelParameterValue test coverage

[pardoner]

Testing done

Tested the label parameters within the node label builder. The Assert method was used to evaluate tests. The automated tests within the console were successful.

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[MarkEWaite]

Thanks for the pull request @pardoner .

Several of the statements that you added did not assert their results. I've added assertions for the results.

Several of the additions were further from their assertions than I usually prefer, so I moved the initialization and the assertion nearer each other.

I used hamcrest assertions for the assertions that I added because I find their failure messages easier to understand.