​The submitted repository must include tests

[anastasiabusygina]

​The submitted repository must include Tests demonstrating the behaviors checked by our example Collateral plugin test, which we encourage you to use as a starting template for your own testing. Particular behaviors must include:

• Deployment.
• Issuance, appreciation, and redemption of an RToken with this Collateral in its basket.
• Claiming rewards (or, if no rewards are available for this token, tests demonstrating that the claim-reward functions do nothing and don't revert)
• Correct behavior for price() when any price sources return invalid values.
• Correctly changing status() whenever that's needed in order to flag sudden or impending default.