test(YouTube Node): Add tests for YouTube Node (#14459)

Co-authored-by: Roman Davydchuk <roman.davydchuk@n8n.io>

packages/nodes-base/nodes/Google/YouTube/__test__/GenericFunctions.test.ts

@@ -0,0 +1,38 @@
+import { DateTime } from 'luxon';
+import { NodeOperationError, type IExecuteFunctions } from 'n8n-workflow';
+
+import { validateAndSetDate } from '../../GenericFunctions';
+
+const mockContext = {
+	getNode: jest.fn().mockReturnValue('Youtube'),
+} as unknown as IExecuteFunctions;
+
+describe('validateAndSetDate', () => {
+	const timezone = 'America/New_York';
+	let filter: { [key: string]: string };
+
+	beforeEach(() => {
+		filter = {};
+	});
+
+	it('should convert a valid ISO date and set it with the specified timezone', () => {
+		filter.publishedAfter = '2023-10-05T10:00:00.000Z';
+		validateAndSetDate(filter, 'publishedAfter', timezone, mockContext);
+
+		expect(filter.publishedAfter).toBe(
+			DateTime.fromISO('2023-10-05T10:00:00.000Z').setZone(timezone).toISO(),
+		);
+	});
+
+	it('should throw NodeOperationError for an invalid date', () => {
+		filter.publishedAfter = 'invalid-date';
+
+		expect(() => validateAndSetDate(filter, 'publishedAfter', timezone, mockContext)).toThrow(
+			NodeOperationError,
+		);
+
+		expect(() => validateAndSetDate(filter, 'publishedAfter', timezone, mockContext)).toThrow(
+			`The value "${filter.publishedAfter}" is not a valid DateTime.`,
+		);
+	});
+});