Add test cases ensuring correct zero frequency behaviour on tracks
Add test cases ensuring correct zero frequency behaviour on tracks

ppy/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,ppy/osu-framework,peppy/osu-framework,ZLima12/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,ZLima12/osu-framework