MCP Time Server Node

/** * Edge case tests for MCP SDK Adapter error mapping * * These tests verify we handle unusual error conditions safely */ import { McpError, ErrorCode } from '@modelcontextprotocol/sdk/types.js'; import { mapToMcpError } from '../../../src/adapters/mcp-sdk/mapper'; describe('MCP SDK Adapter - Edge Cases', () => { describe('mapToMcpError edge cases', () => { it('should handle null error', () => { const mcpError = mapToMcpError(null, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.code).toBe(ErrorCode.InternalError); expect(mcpError.message).toContain('[testTool]'); }); it('should handle undefined error', () => { const mcpError = mapToMcpError(undefined, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.code).toBe(ErrorCode.InternalError); expect(mcpError.message).toContain('[testTool]'); }); it('should handle circular reference in error object', () => { const circularError: any = { message: 'circular' }; circularError.self = circularError; // Create circular reference const mcpError = mapToMcpError(circularError, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.code).toBe(ErrorCode.InternalError); // Should not crash when trying to stringify }); it('should handle error with throwing getter', () => { const error = { get message() { throw new Error('Getter throws!'); }, }; const mcpError = mapToMcpError(error, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.code).toBe(ErrorCode.InternalError); // Should not crash }); it('should handle nested errors with cause', () => { const rootCause = new Error('Root cause'); const middleError = new Error('Middle error'); middleError.cause = rootCause; const topError = new Error('Top error'); topError.cause = middleError; const mcpError = mapToMcpError(topError, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.message).toContain('Top error'); // Should include cause chain information expect(mcpError.data).toHaveProperty('cause'); }); it('should truncate extremely large error details', () => { const hugeDetails = { data: 'x'.repeat(100000), // 100KB of data nested: { more: 'y'.repeat(100000), }, }; const error = new Error('Large error'); (error as any).details = hugeDetails; const mcpError = mapToMcpError(error, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); // Details should be truncated or omitted if (mcpError.data) { const serialized = JSON.stringify(mcpError.data); expect(serialized.length).toBeLessThan(10000); // Max 10KB } }); it('should handle symbol properties in error', () => { const error = new Error('Symbol error'); const sym = Symbol('test'); (error as any)[sym] = 'hidden value'; const mcpError = mapToMcpError(error, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.message).toContain('Symbol error'); // Should not crash on symbols }); it('should handle frozen error objects', () => { const error = new Error('Frozen error'); Object.freeze(error); const mcpError = mapToMcpError(error, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.message).toContain('Frozen error'); }); it('should handle Promise rejection values', async () => { // Create a rejected promise without triggering unhandled rejection const promiseRejection = Promise.reject('Rejected!'); promiseRejection.catch(() => {}); // Handle the rejection const mcpError = mapToMcpError(promiseRejection, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); // Should handle Promise as an object }); it('should handle error with numeric code property', () => { const error = new Error('Numeric code'); (error as any).code = 404; const mcpError = mapToMcpError(error, 'testTool'); expect(mcpError).toBeInstanceOf(McpError); expect(mcpError.data).toHaveProperty('originalCode', 404); }); }); });