This commit adds a test that check the creation, effectiveness and update of a lockfile. Testing this functionality via the dump plugin is sufficient, as the plugin directly uses the checkout workflow. Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com> [Jan: fix over-long lines and removed assert brackets] Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>