Add test case for Gotta Snatch'Em All

[nico-or]

Add a test case for totalCards using a singleton list as input since there it wasn't any before.

Discussed in issue #684

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[nico-or]

I wasn't aware of the [no important files changed] flag. Should I add it to the commit body to avoid the re-run of tests?

[jiegillet]

I wasn't aware of the [no important files changed] flag. Should I add it to the commit body to avoid the re-run of tests?

No don't, this new test could potentially reveal issues with some solutions, rerunning the tests is what we want :)

[jiegillet]

@nico-or any reason why this is still a draft?

[nico-or]

@nico-or any reason why this is still a draft?

No, I just forgot to switch the status.

[jiegillet]

Thank you 👍