Characteristic Test 1: Creation of object under test.
Characteristics Test 2: Play Song (2nd public API), resulting in test
coverage of 65.1%.
Characteristics Test 3: Exception, resulting in Test Coverage of 75.2%.
Characteristics Test 4: Get composite variable SongPlayerStatistics,
resulting in Test Coverage of 85.3%.
Characteristics Test 6: Add missing test based on Test Coverage
statistics