first commit

tests/unit/time.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from "vitest";
+
+import { addMinutes, clampRange, minutesBetween } from "@/lib/time";
+
+describe("time helpers", () => {
+  it("adds minutes correctly", () => {
+    const base = new Date("2026-04-06T10:00:00.000Z");
+    const result = addMinutes(base, 35);
+    expect(result.toISOString()).toBe("2026-04-06T10:35:00.000Z");
+  });
+
+  it("returns overlap range", () => {
+    const overlap = clampRange(
+      new Date("2026-04-06T10:00:00.000Z"),
+      new Date("2026-04-06T11:00:00.000Z"),
+      new Date("2026-04-06T10:30:00.000Z"),
+      new Date("2026-04-06T12:00:00.000Z")
+    );
+    expect(overlap?.start.toISOString()).toBe("2026-04-06T10:30:00.000Z");
+    expect(overlap?.end.toISOString()).toBe("2026-04-06T11:00:00.000Z");
+    expect(minutesBetween(overlap!.start, overlap!.end)).toBe(30);
+  });
+});