test(Cron): Add test to Cron node

packages/nodes-base/nodes/Cron/test/Cron.node.test.ts

@@ -0,0 +1,48 @@
+import { mock } from 'jest-mock-extended';
+import { get } from 'lodash';
+import {
+	type ITriggerFunctions,
+	type INodeExecutionData,
+	type IDataObject,
+	type IGetNodeParameterOptions,
+} from 'n8n-workflow';
+
+import { Cron } from '../Cron.node';
+
+describe('Cron Node', () => {
+	const node = new Cron();
+
+	const createMockExecuteFunction = (nodeParameters: IDataObject) => {
+		const fakeExecuteFunction = {
+			getNodeParameter(
+				parameterName: string,
+				fallbackValue?: IDataObject | undefined,
+				options?: IGetNodeParameterOptions | undefined,
+			) {
+				const parameter = options?.extractValue ? `${parameterName}.value` : parameterName;
+
+				const parameterValue = get(nodeParameters, parameter, fallbackValue);
+
+				return parameterValue;
+			},
+		} as unknown as ITriggerFunctions;
+		return fakeExecuteFunction;
+	};
+
+	const triggerFunctions = createMockExecuteFunction({
+		triggerTimes: {
+			item: [],
+		},
+	});
+
+	afterAll(() => {
+		jest.resetAllMocks();
+	});
+
+	it('should return a function to trigger', async () => {
+		expect(await node.trigger.call(triggerFunctions)).toEqual({
+			// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+			manualTriggerFunction: expect.any(Function),
+		});
+	});
+});