Create inverse-lerp.test.ts

Author: madsrasmussen

src/packages/core/utils/math/inverse-lerp.test.ts

@@ -0,0 +1,16 @@
+import { expect } from '@open-wc/testing';
+import { inverseLerp, lerp } from './math.js';
+
+describe('inverse lerp', () => {
+	it('Calculate the inverse lerp factor for a value between two points.', () => {
+		expect(inverseLerp(10, 20, 15)).to.equal(0.5);
+		expect(inverseLerp(10, 20, 10)).to.equal(0);
+		expect(inverseLerp(10, 20, 20)).to.equal(1);
+		expect(inverseLerp(10, 20, 5)).to.equal(-0.5);
+		expect(inverseLerp(10, 20, 25)).to.equal(1.5);
+	});
+
+	it('Handle the case where start and end are equal.', () => {
+		expect(inverseLerp(5, 5, 5)).to.equal(0);
+	});
+});