Sync wordy tests

[FraSanga]

As reported in the recurring task in this repo, I updated the tests and checked their implementation in Elixir.

In this case, four new tests were added and also implemented in Elixir.
The tests pass without changing anything.

[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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[github-actions]

Thank you for contributing to exercism/elixir 💜 🎉. This is an automated PR comment 🤖 for the maintainers of this repository that helps with the PR review process. You can safely ignore it and wait for a maintainer to review your changes.

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• General steps

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• Any exercise changed

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• Practice exercise changed

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Automated comment created by PR Commenter 🤖.

[angelikatyborska]

Thank you