Initial Commit

packages/media/image/colours/src/utils/utils.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    clamp,
+    isFiniteNumber,
+    roundAlpha,
+    roundChannel,
+    roundPercent,
+} from "./utils.js";
+
+describe("utils", () => {
+    it("clamp restricts to range", { timeout: 5000 }, () => {
+        expect(clamp(5, 0, 10)).toBe(5);
+        expect(clamp(-5, 0, 10)).toBe(0);
+        expect(clamp(15, 0, 10)).toBe(10);
+    });
+
+    it("isFiniteNumber rejects non-finite", { timeout: 5000 }, () => {
+        expect(isFiniteNumber(5)).toBe(true);
+        expect(isFiniteNumber(Number.NaN)).toBe(false);
+        expect(isFiniteNumber(Number.POSITIVE_INFINITY)).toBe(false);
+        expect(isFiniteNumber("5")).toBe(false);
+    });
+
+    it("roundChannel clamps to 0-255", { timeout: 5000 }, () => {
+        expect(roundChannel(128.6)).toBe(129);
+        expect(roundChannel(-10)).toBe(0);
+        expect(roundChannel(300)).toBe(255);
+    });
+
+    it("roundPercent clamps to 0-100", { timeout: 5000 }, () => {
+        expect(roundPercent(50.4)).toBe(50);
+        expect(roundPercent(-5)).toBe(0);
+        expect(roundPercent(105)).toBe(100);
+    });
+
+    it("roundAlpha clamps to 0-1", { timeout: 5000 }, () => {
+        expect(roundAlpha(0.5)).toBe(0.5);
+        expect(roundAlpha(-0.1)).toBe(0);
+        expect(roundAlpha(1.1)).toBe(1);
+    });
+});