anEmptyUniverseOnTickTransformsIntoAnEmptyUniverse => failing test
step 1: failing test, extracted actual and expected
step 1: made test pass, distinguished between arrange, act and assert
step 1: extracted method getEmptyUniverse because it was repeating more than 3 times
step 2: created the test
step 2: extracted the expected and actual into variables and separated arrange, act, assert
step 2: made test pass
step 2: extracted the getEmptyUniverse1 method because of rule of three
step 2: extracted method getEmptyUniverseCommon