Create lerp.test.ts

src/Umbraco.Web.UI.Client/src/packages/core/utils/math/lerp.test.ts

@@ -0,0 +1,15 @@
+import { expect } from '@open-wc/testing';
+import { lerp } from './math.js';
+
+describe('lerp', () => {
+	it('Interpolate between two values.', () => {
+		expect(lerp(1, 20, 0.5)).to.equal(10.5);
+		expect(lerp(1, 100, 0.2)).to.equal(20.8);
+		expect(lerp(2, 23, 0.4)).to.equal(10.4);
+		expect(lerp(50, 250, 0.8)).to.equal(210);
+	});
+
+	it('Ensure alpha is clamped to the range [0, 1].', () => {
+		expect(lerp(10, 20, 1.5)).to.equal(20);
+	});
+});