patch.diff

--- src/lib/__tests__/yearInReviewUtils.test.ts
+++ src/lib/__tests__/yearInReviewUtils.test.ts
@@ -83,6 +83,21 @@
         // Hour 5 is encountered first in the 0..23 loop
         expect(getMostActiveHour(heatmap)).toBe(5);
     });
+
+    it("returns 0 when all hours have the same number of commits", () => {
+        const heatmap = Array.from({ length: 7 }, () => Array.from({ length: 24 }, () => 1));
+        // All totals are 7 (1 per day for 7 days), the first hour (0) should be returned
+        expect(getMostActiveHour(heatmap)).toBe(0);
+    });
+
+    it("correctly identifies the most active hour even when commits are sparsely distributed", () => {
+        const heatmap = Array.from({ length: 7 }, () => Array.from({ length: 24 }, () => 0));
+        heatmap[6][23] = 1;
+        heatmap[5][23] = 1; // Hour 23 has 2 commits
+        heatmap[0][1] = 1;  // Hour 1 has 1 commit
+
+        expect(getMostActiveHour(heatmap)).toBe(23);
+    });
 });

 describe("getMostActiveDayFromCalendar", () => {