MCP Xcode

import { DefaultErrorStrategy } from '../../formatters/strategies/DefaultErrorStrategy.js'; describe('DefaultErrorStrategy', () => { function createSUT(): DefaultErrorStrategy { return new DefaultErrorStrategy(); } describe('canFormat', () => { it('should always return true as the fallback strategy', () => { const sut = createSUT(); expect(sut.canFormat(new Error('Any error'))).toBe(true); expect(sut.canFormat({ message: 'Plain object' })).toBe(true); expect(sut.canFormat('String error')).toBe(true); expect(sut.canFormat(123)).toBe(true); expect(sut.canFormat(null)).toBe(true); expect(sut.canFormat(undefined)).toBe(true); expect(sut.canFormat({})).toBe(true); expect(sut.canFormat([])).toBe(true); }); }); describe('format', () => { describe('when formatting errors with messages', () => { it('should return plain message without modification', () => { const sut = createSUT(); const error = new Error('Simple error message'); const result = sut.format(error); expect(result).toBe('Simple error message'); }); it('should preserve message with special characters', () => { const sut = createSUT(); const error = { message: 'Error: with @#$% special chars!' }; const result = sut.format(error); expect(result).toBe('with @#$% special chars!'); }); it('should handle multiline messages', () => { const sut = createSUT(); const error = new Error('First line\nSecond line\nThird line'); const result = sut.format(error); expect(result).toBe('First line\nSecond line\nThird line'); }); }); describe('when cleaning common prefixes', () => { it('should remove "Error:" prefix (case insensitive)', () => { const sut = createSUT(); expect(sut.format(new Error('Error: Something went wrong'))).toBe('Something went wrong'); expect(sut.format(new Error('error: lowercase prefix'))).toBe('lowercase prefix'); expect(sut.format(new Error('ERROR: uppercase prefix'))).toBe('uppercase prefix'); expect(sut.format(new Error('ErRoR: mixed case'))).toBe('mixed case'); }); it('should remove "Invalid arguments:" prefix (case insensitive)', () => { const sut = createSUT(); expect(sut.format(new Error('Invalid arguments: Missing required field'))).toBe('Missing required field'); expect(sut.format(new Error('invalid arguments: lowercase'))).toBe('lowercase'); expect(sut.format(new Error('INVALID ARGUMENTS: uppercase'))).toBe('uppercase'); }); it('should remove "Validation failed:" prefix (case insensitive)', () => { const sut = createSUT(); expect(sut.format(new Error('Validation failed: Bad input'))).toBe('Bad input'); expect(sut.format(new Error('validation failed: lowercase'))).toBe('lowercase'); expect(sut.format(new Error('VALIDATION FAILED: uppercase'))).toBe('uppercase'); }); it('should handle multiple spaces after prefix', () => { const sut = createSUT(); expect(sut.format(new Error('Error: Multiple spaces'))).toBe('Multiple spaces'); expect(sut.format(new Error('Invalid arguments: Extra spaces'))).toBe('Extra spaces'); }); it('should only remove prefix at start of message', () => { const sut = createSUT(); const error = new Error('Something Error: in the middle'); const result = sut.format(error); expect(result).toBe('Something Error: in the middle'); }); it('should handle messages that are only the prefix', () => { const sut = createSUT(); expect(sut.format(new Error('Error:'))).toBe(''); expect(sut.format(new Error('Error: '))).toBe(''); expect(sut.format(new Error('Invalid arguments:'))).toBe(''); expect(sut.format(new Error('Validation failed:'))).toBe(''); }); it('should clean all matching prefixes', () => { const sut = createSUT(); const error = new Error('Error: Invalid arguments: Something'); const result = sut.format(error); // Both "Error:" and "Invalid arguments:" are cleaned expect(result).toBe('Something'); }); }); describe('when handling errors without messages', () => { it('should return default message for error without message property', () => { const sut = createSUT(); const error = {}; const result = sut.format(error); expect(result).toBe('An error occurred'); }); it('should return default message for null error', () => { const sut = createSUT(); const result = sut.format(null); expect(result).toBe('An error occurred'); }); it('should return default message for undefined error', () => { const sut = createSUT(); const result = sut.format(undefined); expect(result).toBe('An error occurred'); }); it('should return default message for non-object errors', () => { const sut = createSUT(); expect(sut.format('string error')).toBe('An error occurred'); expect(sut.format(123)).toBe('An error occurred'); expect(sut.format(true)).toBe('An error occurred'); expect(sut.format([])).toBe('An error occurred'); }); it('should handle error with null message', () => { const sut = createSUT(); const error = { message: null }; const result = sut.format(error); expect(result).toBe('An error occurred'); }); it('should handle error with undefined message', () => { const sut = createSUT(); const error = { message: undefined }; const result = sut.format(error); expect(result).toBe('An error occurred'); }); it('should handle error with empty string message', () => { const sut = createSUT(); const error = { message: '' }; const result = sut.format(error); expect(result).toBe('An error occurred'); }); it('should handle error with whitespace-only message', () => { const sut = createSUT(); const error = { message: ' ' }; const result = sut.format(error); expect(result).toBe(' '); // Preserves whitespace as it's truthy }); }); describe('when handling edge cases', () => { it('should handle very long messages', () => { const sut = createSUT(); const longMessage = 'A'.repeat(10000); const error = new Error(longMessage); const result = sut.format(error); expect(result).toBe(longMessage); }); it('should preserve unicode and emoji', () => { const sut = createSUT(); const error = new Error('Error: Failed to process 你好 🚫'); const result = sut.format(error); expect(result).toBe('Failed to process 你好 🚫'); }); it('should handle messages with only special characters', () => { const sut = createSUT(); const error = new Error('@#$%^&*()'); const result = sut.format(error); expect(result).toBe('@#$%^&*()'); }); it('should handle error-like objects with toString', () => { const sut = createSUT(); const error = { message: 'Custom error', toString: () => 'ToString output' }; const result = sut.format(error); expect(result).toBe('Custom error'); // Prefers message over toString }); it('should not modify messages without known prefixes', () => { const sut = createSUT(); const messages = [ 'Unknown prefix: Something', 'Warning: Something else', 'Notice: Important info', 'Failed: Operation incomplete' ]; messages.forEach(msg => { const error = new Error(msg); expect(sut.format(error)).toBe(msg); }); }); }); }); });