Cleanup: Use Standard Tech for Test Fixtures

[wadoon]

This PR removes the LineProperties.java in favor of YAML test fixture.

Pros:

• Support by JUnit YamlSource in parameterized test
• Support for YAML in browser
• Flexibility and type safety

This PR brings two dependencies for tests:

• AssertJ for writing simpler assertion in test with better messages.
• Jackson for reading YAML

[mattulbrich]

Unfortunately, this PR does not follow the PR summary template of the project. Can you please provide the information of the template?

[mattulbrich]

Thanks for replacing the parser. Actually, I think it is more understanable and clearer with the test cases in individual files. Can that be arranged?

[wadoon]

Thanks for replacing the parser. Actually, I think it is more understanable and clearer with the test cases in individual files. Can that be arranged?

done

[mattulbrich]

Thanks for replacing the parser. Actually, I think it is more understanable and clearer with the test cases in individual files. Can that be arranged?

done

thanks. Is it on purpose that the files are in a different directory now?

[wadoon]

thanks. Is it on purpose that the files are in a different directory now?

Avoidance of one more folder level in the hierarchy. It seemed to be unnecessary for script fixtures.

[mattulbrich]

I have little experience with yml, and, hence, it seems to me that this change actually adds complexity rather than reducing it. I cannot appreciate the improvements that this PR bring. Perhaps someone more familiar w/ the language can see this and do the review.