fix(core): Improve model sub-nodes error handling (#11418)

packages/@n8n/nodes-langchain/nodes/llms/n8nDefaultFailedAttemptHandler.test.ts

@@ -0,0 +1,66 @@
+import { n8nDefaultFailedAttemptHandler } from './n8nDefaultFailedAttemptHandler';
+
+class MockHttpError extends Error {
+	response: { status: number };
+
+	constructor(message: string, code: number) {
+		super(message);
+		this.response = { status: code };
+	}
+}
+
+describe('n8nDefaultFailedAttemptHandler', () => {
+	it('should throw error if message starts with "Cancel"', () => {
+		const error = new Error('Cancel operation');
+		expect(() => n8nDefaultFailedAttemptHandler(error)).toThrow(error);
+	});
+
+	it('should throw error if message starts with "AbortError"', () => {
+		const error = new Error('AbortError occurred');
+		expect(() => n8nDefaultFailedAttemptHandler(error)).toThrow(error);
+	});
+
+	it('should throw error if name is "AbortError"', () => {
+		class MockAbortError extends Error {
+			constructor() {
+				super('Some error');
+				this.name = 'AbortError';
+			}
+		}
+
+		const error = new MockAbortError();
+
+		expect(() => n8nDefaultFailedAttemptHandler(error)).toThrow(error);
+	});
+
+	it('should throw error if code is "ECONNABORTED"', () => {
+		class MockAbortError extends Error {
+			code: string;
+
+			constructor() {
+				super('Some error');
+				this.code = 'ECONNABORTED';
+			}
+		}
+
+		const error = new MockAbortError();
+		expect(() => n8nDefaultFailedAttemptHandler(error)).toThrow(error);
+	});
+
+	it('should throw error if status is in STATUS_NO_RETRY', () => {
+		const error = new MockHttpError('Some error', 400);
+		expect(() => n8nDefaultFailedAttemptHandler(error)).toThrow(error);
+	});
+
+	it('should not throw error if status is not in STATUS_NO_RETRY', () => {
+		const error = new MockHttpError('Some error', 500);
+		error.response = { status: 500 };
+
+		expect(() => n8nDefaultFailedAttemptHandler(error)).not.toThrow();
+	});
+
+	it('should not throw error if no conditions are met', () => {
+		const error = new Error('Some random error');
+		expect(() => n8nDefaultFailedAttemptHandler(error)).not.toThrow();
+	});
+});