series: Sync tests

[tasxatzial]

The order of argument checks regarding error cases is from the first argument to last (first argument is checked, if it does not throw error, then the second argument is checked and so on)

Edit: This applies only to the example solution. There are no test cases where both arguments result in an error.

[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]

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