This patch refactors the menu test by moving the monkey patching out
into a fixture. When changing the cwd, we now use the monkeypatch
tooling. By that, the following tests are not affected by a failure in a
previous one, which leads to a cleaner test report.
Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>