Adding unit tests and test reporting to the dataframe-rules-engine

[stikkireddy]

added jacoco plugin into sbt added ruletype enum to make it easier to manage rule types for testing added entry to contributing.md on how to submit pull requests added information to readme on how to run tests altered gitignore to include plugins.sbt which is for jacoco test reports altered build.sbt to include jacoco test reporting & added scalatest added 6 tests regarding validation.

[stikkireddy]

@GeekSheikh let me know what you think 😄

[GeekSheikh]

Will review ASAP. Thank you!

[GeekSheikh]

Hey, Sri,

This is great, thanks for building up the scaffolding and throwing in a few tests. If you get some time, could you review this PR? It fixed a bug with the output report, if you get time, please add some additional tests to validate the output df.

Also, is the coverage sufficient for all the tests without explicitly doing the test with a group by and without a group by? I saw the validations on the group by cols, but not 100% sure that covers all cases.

We also need to add an agg column in each test to validate the agg expressions vs simple column expressions. We also need to add a test for a complex column to each test case such as col("retail_price" - col("scan_price") to ensure we're validating expressions properly.

I believe these would be simple, quick additions, do you think you will have time to add them soon? Appreciate the contribution.

Summary

• Output Report Validations
• Add group by tests where/if needed
• Add aggregate columns to each test with Rules
• Add complex expression to each test with Rules