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packages/nodes-base/nodes/Code/test/utils.test.ts

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+import { mock } from 'jest-mock-extended';
+import type { IExecuteFunctions, INodeExecutionData } from 'n8n-workflow';
+
+import { addPostExecutionWarning } from '../utils';
+
+describe('addPostExecutionWarning', () => {
+	const context = mock<IExecuteFunctions>();
+	const inputItemsLength = 2;
+
+	beforeEach(() => jest.resetAllMocks());
+
+	it('should add execution hints when returnData length differs from inputItemsLength', () => {
+		const returnData: INodeExecutionData[] = [{ json: {}, pairedItem: 0 }];
+
+		addPostExecutionWarning(context, returnData, inputItemsLength);
+
+		expect(context.addExecutionHints).toHaveBeenCalledWith({
+			message:
+				'To make sure expressions after this node work, return the input items that produced each output item. <a target="_blank" href="https://docs.n8n.io/data/data-mapping/data-item-linking/item-linking-code-node/">More info</a>',
+			location: 'outputPane',
+		});
+	});
+
+	it('should add execution hints when any item has undefined pairedItem', () => {
+		const returnData: INodeExecutionData[] = [{ json: {}, pairedItem: 0 }, { json: {} }];
+
+		addPostExecutionWarning(context, returnData, inputItemsLength);
+
+		expect(context.addExecutionHints).toHaveBeenCalledWith({
+			message:
+				'To make sure expressions after this node work, return the input items that produced each output item. <a target="_blank" href="https://docs.n8n.io/data/data-mapping/data-item-linking/item-linking-code-node/">More info</a>',
+			location: 'outputPane',
+		});
+	});
+
+	it('should not add execution hints when all items match inputItemsLength and have defined pairedItem', () => {
+		const returnData: INodeExecutionData[] = [
+			{ json: {}, pairedItem: 0 },
+			{ json: {}, pairedItem: 1 },
+		];
+
+		addPostExecutionWarning(context, returnData, inputItemsLength);
+
+		expect(context.addExecutionHints).not.toHaveBeenCalled();
+	});
+});