org.junit.ComparisonFailure: [After creating an appearance with values
performer = AC/DC (ROCK)
stage = MainStage
begin = 2017-08-15T18:00
end = 2017-08-15T21:00
 toString() should return 15.08.2017 18:00-21:00: AC/DC (ROCK) @ MainStage.] expected:<"15.08.2017 18:0[0-21:0]0: AC/DC (ROCK) @ Ma...> but was:<"15.08.2017 18:0[-21:]0: AC/DC (ROCK) @ Ma...>