Clear results of previous test when submitting a new test

At the moment, the results of a test remain displayed until they are replaced with the results of a subsequent test. If you're running multiple tests with the same expected result, it is not possible to know when the subsequent test has completed.

Either there should be some indication that execution is ongoing/completed or (probably a simpler solution) the results of the previous test should be removed as soon as you submit a new test (i.e., either upload a new test file or switch to the edit tab and then back to test).