Create debounce.function.test.ts

src/packages/core/utils/debounce/debounce.function.test.ts

@@ -0,0 +1,38 @@
+import { expect } from '@open-wc/testing';
+import { debounce } from './debounce.function.js';
+
+describe('debounce', () => {
+	it('should call the function only once after the timeout', async () => {
+		let count = 0;
+		const debounced = debounce(() => count++, 100);
+
+		debounced();
+		debounced();
+		debounced();
+		debounced();
+		debounced();
+
+		expect(count).to.equal(0);
+
+		await new Promise((resolve) => setTimeout(resolve, 200));
+
+		expect(count).to.equal(1);
+	});
+
+	it('should call the function with the latest arguments', async () => {
+		let count = 0;
+		const debounced = debounce((value: number) => (count = value), 100);
+
+		debounced(1);
+		debounced(2);
+		debounced(3);
+		debounced(4);
+		debounced(5);
+
+		expect(count).to.equal(0);
+
+		await new Promise((resolve) => setTimeout(resolve, 200));
+
+		expect(count).to.equal(5);
+	});
+});