michaelschiemer/tests/core/Logger.test.js

/**
 * @jest-environment jsdom
 */

import { Logger } from '../../resources/js/core/logger.js';

// Mock the frameloop dependency
jest.mock('../../resources/js/core/frameloop.js', () => ({
  monitor: {
    log: jest.fn()
  }
}));

import { monitor } from '../../resources/js/core/frameloop.js';

describe('Logger', () => {
  beforeEach(() => {
    Logger.enabled = true;
    jest.clearAllMocks();
  });

  describe('Basic logging functionality', () => {
    test('should log messages when enabled', () => {
      const consoleSpy = jest.spyOn(console, 'log').mockImplementation();
      
      Logger.log('test message');
      
      expect(consoleSpy).toHaveBeenCalledWith(
        expect.stringContaining('[LOG]')
      );
      expect(consoleSpy).toHaveBeenCalledWith(
        expect.stringContaining('test message')
      );
      
      consoleSpy.mockRestore();
    });

    test('should not log messages when disabled', () => {
      Logger.enabled = false;
      const consoleSpy = jest.spyOn(console, 'info').mockImplementation();
      
      Logger.info('test message');
      
      expect(consoleSpy).not.toHaveBeenCalled();
      
      consoleSpy.mockRestore();
    });

    test('should handle different log levels', () => {
      const methods = ['log', 'warn', 'info', 'error'];
      
      methods.forEach(method => {
        const consoleSpy = jest.spyOn(console, method).mockImplementation();
        
        Logger[method]('test message');
        
        expect(consoleSpy).toHaveBeenCalledWith(
          expect.stringContaining(`[${method.toUpperCase()}]`)
        );
        
        consoleSpy.mockRestore();
      });
    });

    test('should format timestamps correctly', () => {
      const consoleSpy = jest.spyOn(console, 'info').mockImplementation();
      
      Logger.info('test message');
      
      const logCall = consoleSpy.mock.calls[0][0];
      expect(logCall).toMatch(/\[\d{2}:\d{2}:\d{2}\]/);
      
      consoleSpy.mockRestore();
    });

    test('should stringify objects', () => {
      const consoleSpy = jest.spyOn(console, 'info').mockImplementation();
      const testObj = { key: 'value', number: 42 };
      
      Logger.info('Object:', testObj);
      
      const logCall = consoleSpy.mock.calls[0][0];
      expect(logCall).toContain('{"key":"value","number":42}');
      
      consoleSpy.mockRestore();
    });

    test('should handle mixed argument types', () => {
      const consoleSpy = jest.spyOn(console, 'log').mockImplementation();
      
      Logger.log('Message:', 42, { key: 'value' }, true);
      
      const logCall = consoleSpy.mock.calls[0][0];
      expect(logCall).toContain('Message: 42 {"key":"value"} true');
      
      consoleSpy.mockRestore();
    });
  });

  describe('Monitor integration', () => {
    test('should call monitor.log when available', () => {
      const consoleSpy = jest.spyOn(console, 'info').mockImplementation();
      
      Logger.info('test message');
      
      expect(monitor.log).toHaveBeenCalledWith(
        expect.stringContaining('test message')
      );
      
      consoleSpy.mockRestore();
    });

    test('should handle missing monitor gracefully', () => {
      // Temporarily remove monitor
      const originalMonitor = monitor.log;
      monitor.log = undefined;
      
      const consoleSpy = jest.spyOn(console, 'info').mockImplementation();
      
      expect(() => {
        Logger.info('test message');
      }).not.toThrow();
      
      monitor.log = originalMonitor;
      consoleSpy.mockRestore();
    });
  });

  describe('Error handling', () => {
    test('should handle console method not available', () => {
      const originalConsole = console.debug;
      console.debug = undefined;
      
      expect(() => {
        Logger._write('debug', '[DEBUG]', ['test']);
      }).not.toThrow();
      
      console.debug = originalConsole;
    });

    test('should handle JSON.stringify errors', () => {
      const consoleSpy = jest.spyOn(console, 'error').mockImplementation();
      
      // Create circular reference
      const circular = {};
      circular.self = circular;
      
      expect(() => {
        Logger.error('Circular:', circular);
      }).not.toThrow();
      
      consoleSpy.mockRestore();
    });
  });

  describe('Performance', () => {
    test('should be performant with many log calls', () => {
      Logger.enabled = false; // Disable actual logging for performance test
      
      const start = performance.now();
      
      for (let i = 0; i < 1000; i++) {
        Logger.info(`Log message ${i}`);
      }
      
      const end = performance.now();
      const duration = end - start;
      
      // Should complete 1000 calls in under 100ms when disabled
      expect(duration).toBeLessThan(100);
    });
  });
});