added FinishWithTentsTest

[Kevin-771]

Description

added tests to FinishWithTentsTest
added comments to FinishWithTentsTest

Closes #604

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (improvement to an already existing feature)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[Corppet]

Changes look good. Project builds just fine with the new unit tests. Comments are clear but a visual representation of the puzzle may be helpful (i.e. draw the grid and mark TENT or GRASS tiles).

[Bram28]

Without a working dev I can;t really comment on this. But I see it has one positive review, so I'll go ahead and approve :P

[charlestian23]

Without a working dev I can;t really comment on this. But I see it has one positive review, so I'll go ahead and approve :P

Alright, I'll merge this PR then.