Song song = new Song();
song.setArtist( artist );
song.setTitle( "A Hard Day's Night" );
Chart chart = new Chart();
chart.setName( "Billboard" );
chart.setType( "record-sales" );
ChartEntry chartEntry = ArtistToChartEntry.MAPPER.map( chart, song, 1 );
assertThat( chartEntry ).isNotNull();
assertThat( chartEntry.getArtistName() ).isEqualTo( "The Beatles" );