Sync Rotational cipher

[fejan-malek]

[no important files changed]

#791

• Only testdox comment added in testcases.

[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!

[mk-mxp]

Thank you for your contribution! Everything is OK, only one optional change may be done.

To enhance readability in the online editor, you may move the object construction from setUp() to the individual tests like this:

    public function testRotateAByZero(): void
    {
        $expected = 'a';
        $rotationalCipher = new RotationalCipher();

        $actual = $rotationalCipher->rotate('a', 0);

        $this->assertEquals($expected, $actual);
    }

[mk-mxp]

Great! Thanks for all your contributions.