tests: add OptionsFlow tests (partial coverage)

[palazzem]

Related Issues

n/a

Proposed Changes:

Adds partial coverage for the integration OptionsFlow. The goal is to have a very simple set of tests that can be expanded while working on #60.

Testing:

n/a

Extra Notes (optional):

The change in #60 will complete the module coverage.

Checklist

• [x] Related issues and proposed changes are filled
• [x] Tests are defining the correct and expected behavior
• [x] Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 6748128334

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.6%) to 91.653%

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Totals
Change from base Build 6747994188:	2.6%
Covered Lines:	491
Relevant Lines:	537

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💛 - Coveralls