add tests for getAccumulatedValueOfIndex

Author: madsrasmussen

src/packages/core/utils/math/get-accumulated-value-of-index.test.ts

@@ -0,0 +1,13 @@
+import { expect } from '@open-wc/testing';
+import { getAccumulatedValueOfIndex } from './math.js';
+
+describe('getAccumulatedValueOfIndex', () => {
+	it('should return the accumulated value of an array up to a certain index', () => {
+		expect(getAccumulatedValueOfIndex(0, [1, 2, 3, 4, 5])).to.equal(0);
+		expect(getAccumulatedValueOfIndex(1, [1, 2, 3, 4, 5])).to.equal(1);
+		expect(getAccumulatedValueOfIndex(2, [1, 2, 3, 4, 5])).to.equal(3);
+		expect(getAccumulatedValueOfIndex(3, [1, 2, 3, 4, 5])).to.equal(6);
+		expect(getAccumulatedValueOfIndex(4, [1, 2, 3, 4, 5])).to.equal(10);
+		expect(getAccumulatedValueOfIndex(5, [1, 2, 3, 4, 5])).to.equal(15);
+	});
+});