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packages/nodes-base/nodes/Transform/RemoveDuplicates/v2/test/RemoveDuplicates.test.ts

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+import { mock } from 'jest-mock-extended';
+import type { IExecuteFunctions, INodeExecutionData, INodeTypeBaseDescription } from 'n8n-workflow';
+
+import { RemoveDuplicatesV2 } from '../RemoveDuplicatesV2.node';
+
+describe('RemoveDuplicatesV2', () => {
+	let node: RemoveDuplicatesV2;
+	let executeFunctions: IExecuteFunctions;
+
+	beforeEach(() => {
+		const baseDescription: INodeTypeBaseDescription = {
+			displayName: 'Remove Duplicates',
+			name: 'removeDuplicates',
+			icon: 'file:removeDuplicates.svg',
+			group: ['transform'],
+			description: 'Delete items with matching field values',
+		};
+		node = new RemoveDuplicatesV2(baseDescription);
+		executeFunctions = mock<IExecuteFunctions>();
+		executeFunctions.helpers = {
+			checkProcessedAndRecord: jest.fn(),
+			clearAllProcessedItems: jest.fn(),
+		} as any;
+		executeFunctions.getInputData = jest.fn();
+		executeFunctions.getNodeParameter = jest.fn();
+	});
+
+	it('should Remove items repeated within current input based on all fields', async () => {
+		const items: INodeExecutionData[] = [
+			{ json: { id: 1, name: 'John' } },
+			{ json: { id: 2, name: 'Jane' } },
+			{ json: { id: 1, name: 'John' } },
+		];
+
+		(executeFunctions.getInputData as jest.Mock<any>).mockReturnValue(items);
+		(executeFunctions.getNodeParameter as jest.Mock<any, any>).mockImplementation(
+			(paramName: string) => {
+				if (paramName === 'operation') return 'removeDuplicateInputItems';
+				if (paramName === 'compare') return 'allFields';
+				return undefined;
+			},
+		);
+
+		const result = await node.execute.call(executeFunctions);
+		expect(result).toHaveLength(1);
+		expect(result[0]).toHaveLength(2);
+		expect(result[0][0].json).toEqual({ id: 1, name: 'John' });
+		expect(result[0][1].json).toEqual({ id: 2, name: 'Jane' });
+	});
+
+	it('should Remove items repeated within current input based on selected fields', async () => {
+		const items: INodeExecutionData[] = [
+			{ json: { id: 1, name: 'John' } },
+			{ json: { id: 2, name: 'Jane' } },
+			{ json: { id: 1, name: 'Doe' } },
+		];
+
+		(executeFunctions.getInputData as jest.Mock<any, any>).mockReturnValue(items);
+		(executeFunctions.getNodeParameter as jest.Mock<any, any>).mockImplementation(
+			(paramName: string) => {
+				if (paramName === 'operation') return 'removeDuplicateInputItems';
+				if (paramName === 'compare') return 'selectedFields';
+				if (paramName === 'fieldsToCompare') return 'id';
+				return undefined;
+			},
+		);
+
+		const result = await node.execute.call(executeFunctions);
+		expect(result).toHaveLength(1);
+		expect(result[0]).toHaveLength(2);
+		expect(result[0][0].json).toEqual({ id: 1, name: 'John' });
+		expect(result[0][1].json).toEqual({ id: 2, name: 'Jane' });
+	});
+
+	it('should remove items seen in previous executions', async () => {
+		const items: INodeExecutionData[] = [
+			{ json: { id: 1, name: 'John' } },
+			{ json: { id: 2, name: 'Jane' } },
+			{ json: { id: 3, name: 'Doe' } },
+		];
+
+		(executeFunctions.getInputData as jest.Mock<any, any>).mockReturnValue(items);
+		(executeFunctions.getNodeParameter as jest.Mock<any, any>).mockImplementation(
+			(paramName: string, itemIndex: number) => {
+				if (paramName === 'operation') return 'removeItemsSeenInPreviousExecutions';
+				if (paramName === 'logic') return 'removeItemsWithAlreadySeenKeyValues';
+				if (paramName === 'dedupeValue' && itemIndex === 0) return 1;
+				if (paramName === 'dedupeValue' && itemIndex === 1) return 2;
+				if (paramName === 'dedupeValue' && itemIndex === 2) return 3;
+				if (paramName === 'options.scope') return 'node';
+				if (paramName === 'options.historySize') return 10;
+			},
+		);
+		executeFunctions.helpers.getProcessedDataCount = jest.fn().mockReturnValue(3);
+		(executeFunctions.helpers.checkProcessedAndRecord as jest.Mock).mockReturnValue({
+			new: [1, 3],
+			processed: [2],
+		});
+
+		const result = await node.execute.call(executeFunctions);
+		expect(result).toHaveLength(2);
+		expect(result[0]).toHaveLength(2);
+		expect(result[1]).toHaveLength(1);
+		expect(result[0][0].json).toEqual({ id: 1, name: 'John' });
+		expect(result[0][1].json).toEqual({ id: 3, name: 'Doe' });
+	});
+
+	it('should clean database when managing key values', async () => {
+		const items: INodeExecutionData[] = [
+			{ json: { id: 1, name: 'John' } },
+			{ json: { id: 2, name: 'Jane' } },
+		];
+
+		(executeFunctions.getInputData as jest.Mock<any, any>).mockReturnValue(items);
+		(executeFunctions.getNodeParameter as jest.Mock<any, any>).mockImplementation(
+			(paramName: string) => {
+				if (paramName === 'operation') return 'clearDeduplicationHistory';
+				if (paramName === 'mode') return 'cleanDatabase';
+				if (paramName === 'options.scope') return 'node';
+				return undefined;
+			},
+		);
+
+		const result = await node.execute.call(executeFunctions);
+		expect(result).toHaveLength(1);
+		expect(result[0]).toHaveLength(2);
+		expect(result[0][0].json).toEqual({ id: 1, name: 'John' });
+		expect(result[0][1].json).toEqual({ id: 2, name: 'Jane' });
+	});
+});