Look for ways to test result card styling without the Result Container

[surchs]

the test is more like a mini-integration test. To check if download button styles correctly if any dataset is selected, you could just feed the selectedDatasets prop non-empty. Here you're testing that step, but also the correct event handling for a checked dataset card, and then whether the ResultContainer processes this info correctly. So 3 steps in one. The goal would be to really just test one thing

Originally posted by @surchs in #31 (comment)