Add junit 4 annotation for tests

Signed-off-by: Igor Popov <igor.popov@napa.fi>
Use single quotes

Signed-off-by: Igor Popov <igor.popov@napa.fi>
Remove useless dependency

Signed-off-by: Igor Popov <igor.popov@napa.fi>
Update pitest plugin to 0.30.1 (fixes issues on Windows)

Signed-off-by: Igor Popov <igor.popov@napa.fi>