add tests

Author: madsrasmussen

src/packages/core/utils/math/get-interpolated-index-of-position-in-weight-map.test.ts

@@ -0,0 +1,18 @@
+import { expect } from '@open-wc/testing';
+import { getInterpolatedIndexOfPositionInWeightMap } from './math.js';
+
+describe('getInterpolatedIndexOfPositionInWeightMap', () => {
+	it('should return the interpolated index of a value in a weight map', () => {
+		const weights = [10, 20, 30, 40, 50];
+		expect(getInterpolatedIndexOfPositionInWeightMap(-10, weights)).to.equal(0);
+		expect(getInterpolatedIndexOfPositionInWeightMap(0, weights)).to.equal(0);
+		expect(getInterpolatedIndexOfPositionInWeightMap(5, weights)).to.equal(0.5);
+		expect(getInterpolatedIndexOfPositionInWeightMap(15, weights)).to.equal(1.25);
+		expect(getInterpolatedIndexOfPositionInWeightMap(35, weights)).to.equal(2.1666666666666665);
+		expect(getInterpolatedIndexOfPositionInWeightMap(45, weights)).to.equal(2.5);
+		expect(getInterpolatedIndexOfPositionInWeightMap(50, weights)).to.equal(2.6666666666666665);
+		expect(getInterpolatedIndexOfPositionInWeightMap(60, weights)).to.equal(3);
+		expect(getInterpolatedIndexOfPositionInWeightMap(100, weights)).to.equal(4);
+		expect(getInterpolatedIndexOfPositionInWeightMap(5000, weights)).to.equal(5);
+	});
+});