Merge pull request #714 from CSchulz/patch-3

#701@trivial: Add CustomEvent test.

packages/happy-dom/test/event/CustomEvent.test.ts

@@ -0,0 +1,33 @@
+import CustomEvent from '../../src/event/events/CustomEvent';
+
+describe('CustomEvent', () => {
+	it('Create a CustomEvent', () => {
+		const eventType = 'click';
+		const event = new CustomEvent(eventType);
+		expect(event.type).toBe(eventType);
+		expect(event.detail).toBeNull();
+	});
+
+	it('Create a CustomEvent with detail', () => {
+		const eventType = 'click';
+		const eventDetail = { someInformation: true };
+		const event = new CustomEvent(eventType, { detail: eventDetail });
+		expect(event.type).toBe(eventType);
+		expect(event.detail).toEqual(eventDetail);
+	});
+
+	it('Create a CustomEvent with empty detail', () => {
+		const eventType = 'click';
+		let event = new CustomEvent(eventType, {});
+		expect(event.type).toBe(eventType);
+		expect(event.detail).toBeNull();
+
+		event = new CustomEvent(eventType, { detail: undefined });
+		expect(event.type).toBe(eventType);
+		expect(event.detail).toBeNull();
+
+		event = new CustomEvent(eventType, { detail: null });
+		expect(event.type).toBe(eventType);
+		expect(event.detail).toBeNull();
+	});
+});