refactor(Basic LLM Chain Node): Refactor Basic LLM Chain & add tests (#13850)

packages/@n8n/nodes-langchain/nodes/chains/ChainLLM/test/responseFormatter.test.ts

@@ -0,0 +1,45 @@
+import { formatResponse } from '../methods/responseFormatter';
+
+describe('responseFormatter', () => {
+	describe('formatResponse', () => {
+		it('should format string responses', () => {
+			const result = formatResponse('Test response');
+			expect(result).toEqual({
+				response: {
+					text: 'Test response',
+				},
+			});
+		});
+
+		it('should trim string responses', () => {
+			const result = formatResponse('  Test response with whitespace   ');
+			expect(result).toEqual({
+				response: {
+					text: 'Test response with whitespace',
+				},
+			});
+		});
+
+		it('should handle array responses', () => {
+			const testArray = [{ item: 1 }, { item: 2 }];
+			const result = formatResponse(testArray);
+			expect(result).toEqual({ data: testArray });
+		});
+
+		it('should handle object responses', () => {
+			const testObject = { key: 'value', nested: { key: 'value' } };
+			const result = formatResponse(testObject);
+			expect(result).toEqual(testObject);
+		});
+
+		it('should handle primitive non-string responses', () => {
+			const testNumber = 42;
+			const result = formatResponse(testNumber);
+			expect(result).toEqual({
+				response: {
+					text: 42,
+				},
+			});
+		});
+	});
+});