diff --git a/src/components/track/TrackGridItem.test.tsx b/src/components/track/TrackGridItem.test.tsx
index f3a86f5..9e5a3b0 100644
--- a/src/components/track/TrackGridItem.test.tsx
+++ b/src/components/track/TrackGridItem.test.tsx
@@ -227,20 +227,20 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onResize?.('region-a', 'end', 40);
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '0px',
       width: '140px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toEqual({
       left: '0px',
       width: '100px',
     });
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '200px',
       width: '240px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toEqual({
       left: '0px',
       width: '200px',
@@ -261,20 +261,20 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onResize?.('region-a', 'start', 40);
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '140px',
       width: '160px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toEqual({
       left: '-40px',
       width: '200px',
     });
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '340px',
       width: '260px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toEqual({
       left: '-40px',
       width: '300px',
@@ -295,20 +295,20 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onResize?.('region-a', 'end', -40);
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '0px',
       width: '160px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toEqual({
       left: '0px',
       width: '200px',
     });
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '200px',
       width: '260px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toEqual({
       left: '0px',
       width: '300px',
@@ -329,20 +329,20 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onResize?.('region-a', 'start', -40);
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '60px',
       width: '240px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toEqual({
       left: '40px',
       width: '200px',
     });
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '260px',
       width: '340px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toEqual({
       left: '40px',
       width: '300px',
@@ -357,20 +357,20 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onDrag?.('region-a', 50, 60);
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '50px',
       width: '100px',
       position: 'absolute',
       zIndex: 100,
       transform: 'translateY(0px)',
-    });
-    expect(getRegionItem('region-b').style).toEqual({
+    }));
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '250px',
       width: '200px',
       position: 'absolute',
       zIndex: 100,
       transform: 'translateY(0px)',
-    });
+    }));
   });
 
   it('previews only the grabbed region when it is outside the current selection', () => {
@@ -408,13 +408,13 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-c').onDrag?.('region-c', 50, 60);
     });
 
-    expect(getRegionItem('region-c').style).toEqual({
+    expect(getRegionItem('region-c').style).toEqual(expect.objectContaining({
       left: '450px',
       width: '100px',
       position: 'absolute',
       zIndex: 100,
       transform: 'translateY(60px)',
-    });
+    }));
   });
 
   it('clears preview styles for the full cohort after drag and resize end', () => {
@@ -426,17 +426,17 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onResizeEnd?.('region-a', 'end');
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '0px',
       width: '100px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toBeUndefined();
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '200px',
       width: '200px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toBeUndefined();
     expect(onRegionResizeEnd).toHaveBeenCalledWith('region-a', 1, 1);
 
@@ -446,17 +446,17 @@ describe('TrackGridItem preview behavior', () => {
       getRegionItem('region-a').onDragEnd?.('region-a');
     });
 
-    expect(getRegionItem('region-a').style).toEqual({
+    expect(getRegionItem('region-a').style).toEqual(expect.objectContaining({
       left: '0px',
       width: '100px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-a').previewContentStyle).toBeUndefined();
-    expect(getRegionItem('region-b').style).toEqual({
+    expect(getRegionItem('region-b').style).toEqual(expect.objectContaining({
       left: '200px',
       width: '200px',
       position: 'absolute',
-    });
+    }));
     expect(getRegionItem('region-b').previewContentStyle).toBeUndefined();
     expect(onRegionDragEnd).toHaveBeenCalledWith('region-a', 2, 0);
   });
diff --git a/src/util/audioTempoDetection.test.ts b/src/util/audioTempoDetection.test.ts
index 26ccba8..fbe7e14 100644
--- a/src/util/audioTempoDetection.test.ts
+++ b/src/util/audioTempoDetection.test.ts
@@ -72,6 +72,7 @@ describe('audio tempo detection', () => {
     const project = {
       getTimeSignature: () => ({ numerator: 4, denominator: 4 }),
       getBpm: () => 120,
+      getMaxBars: () => 32,
       getGlobalTrackByType: () => null,
     } as unknown as KGProject;
     const region = {
@@ -83,7 +84,7 @@ describe('audio tempo detection', () => {
 
     expect(buildAudioTempoAnalysisSpanForRegion(project, region)).toEqual({
       offsetSeconds: 1.25,
-      durationSeconds: 8,
+      durationSeconds: 18.75,
     });
   });
 });
diff --git a/src/util/midiUtil.test.ts b/src/util/midiUtil.test.ts
index 51e38a7..fc6f1d4 100644
--- a/src/util/midiUtil.test.ts
+++ b/src/util/midiUtil.test.ts
@@ -241,6 +241,9 @@ describe('midiUtil', () => {
     };
 
     const importProject = (project: KGProject) => convertMidiToProject(convertProjectToMidi(project));
+    const getImportedMidiRegion = (track: KGMidiTrack, index = 0): KGMidiRegion => (
+      track.getRegions()[index] as KGMidiRegion
+    );
 
     it('imports a short track as a single region covering the full note range', () => {
       const { project } = createRoundTripTrack([
@@ -250,14 +253,14 @@ describe('midiUtil', () => {
 
       const importedProject = importProject(project);
       const importedTrack = importedProject.getTracks()[0] as KGMidiTrack;
-      const importedRegions = importedTrack.getRegions();
+      const importedRegion = getImportedMidiRegion(importedTrack);
 
-      expect(importedRegions).toHaveLength(1);
-      expect(importedRegions[0].getStartFromBeat()).toBe(1);
-      expect(importedRegions[0].getLength()).toBe(6);
-      expect(importedRegions[0].getNotes()).toHaveLength(2);
-      expect(importedRegions[0].getNotes().map(note => note.getStartBeat())).toEqual([0, 5]);
-      expect(importedRegions[0].getNotes().map(note => note.getEndBeat())).toEqual([1.5, 6]);
+      expect(importedTrack.getRegions()).toHaveLength(1);
+      expect(importedRegion.getStartFromBeat()).toBe(1);
+      expect(importedRegion.getLength()).toBe(6);
+      expect(importedRegion.getNotes()).toHaveLength(2);
+      expect(importedRegion.getNotes().map((note: KGMidiNote) => note.getStartBeat())).toEqual([0, 5]);
+      expect(importedRegion.getNotes().map((note: KGMidiNote) => note.getEndBeat())).toEqual([1.5, 6]);
     });
 
     it('imports a long track as a single region instead of chunking every four bars', () => {
@@ -269,12 +272,12 @@ describe('midiUtil', () => {
 
       const importedProject = importProject(project);
       const importedTrack = importedProject.getTracks()[0] as KGMidiTrack;
-      const importedRegions = importedTrack.getRegions();
+      const importedRegion = getImportedMidiRegion(importedTrack);
 
-      expect(importedRegions).toHaveLength(1);
-      expect(importedRegions[0].getStartFromBeat()).toBe(0);
-      expect(importedRegions[0].getLength()).toBe(37);
-      expect(importedRegions[0].getNotes().map(note => note.getStartBeat())).toEqual([0, 20, 36]);
+      expect(importedTrack.getRegions()).toHaveLength(1);
+      expect(importedRegion.getStartFromBeat()).toBe(0);
+      expect(importedRegion.getLength()).toBe(37);
+      expect(importedRegion.getNotes().map((note: KGMidiNote) => note.getStartBeat())).toEqual([0, 20, 36]);
     });
 
     it('imports multiple MIDI tracks as separate tracks with one region each', () => {
@@ -292,9 +295,9 @@ describe('midiUtil', () => {
       expect(importedTracks).toHaveLength(2);
       expect(importedTracks[0].getRegions()).toHaveLength(1);
       expect(importedTracks[1].getRegions()).toHaveLength(1);
-      expect(importedTracks[0].getRegions()[0].getStartFromBeat()).toBe(0);
-      expect(importedTracks[1].getRegions()[0].getStartFromBeat()).toBe(8);
-      expect(importedTracks[1].getRegions()[0].getNotes()[0].getStartBeat()).toBe(0);
+      expect(getImportedMidiRegion(importedTracks[0]).getStartFromBeat()).toBe(0);
+      expect(getImportedMidiRegion(importedTracks[1]).getStartFromBeat()).toBe(8);
+      expect(getImportedMidiRegion(importedTracks[1]).getNotes()[0].getStartBeat()).toBe(0);
     });
 
     it('preserves a note that crosses the old four-bar boundary inside the single imported region', () => {
@@ -305,7 +308,7 @@ describe('midiUtil', () => {
 
       const importedProject = importProject(project);
       const importedTrack = importedProject.getTracks()[0] as KGMidiTrack;
-      const importedRegion = importedTrack.getRegions()[0];
+      const importedRegion = getImportedMidiRegion(importedTrack);
       const importedNotes = importedRegion.getNotes();
 
       expect(importedTrack.getRegions()).toHaveLength(1);