Add simple tests & remove !

src/utils/hsl.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from 'vitest';
+
+import { hsl } from './hsl';
+
+describe('hsl', () => {
+  it('produces pure red at hue 0', () => {
+    const [r, g, b] = hsl(0, 100, 50);
+    expect(r).toBeCloseTo(1);
+    expect(g).toBeCloseTo(0);
+    expect(b).toBeCloseTo(0);
+  });
+  it('produces pure green at hue 120', () => {
+    const [r, g, b] = hsl(120, 100, 50);
+    expect(r).toBeCloseTo(0);
+    expect(g).toBeCloseTo(1);
+    expect(b).toBeCloseTo(0);
+  });
+  it('produces pure blue at hue 240', () => {
+    const [r, g, b] = hsl(240, 100, 50);
+    expect(r).toBeCloseTo(0);
+    expect(g).toBeCloseTo(0);
+    expect(b).toBeCloseTo(1);
+  });
+  it('produces gray at saturation 0', () => {
+    const [r, g, b] = hsl(180, 0, 50);
+    expect(r).toBeCloseTo(0.5);
+    expect(g).toBeCloseTo(0.5);
+    expect(b).toBeCloseTo(0.5);
+  });
+  it('produces black at lightness 0', () => {
+    const [r, g, b] = hsl(0, 100, 0);
+    expect(r).toBe(0);
+    expect(g).toBe(0);
+    expect(b).toBe(0);
+  });
+  it('produces white at lightness 100', () => {
+    const [r, g, b] = hsl(0, 100, 100);
+    expect(r).toBeCloseTo(1);
+    expect(g).toBeCloseTo(1);
+    expect(b).toBeCloseTo(1);
+  });
+});