automaker/apps/server/tests/unit/lib/logger.test.ts

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { LogLevel, createLogger, getLogLevel, setLogLevel } from '@automaker/utils';

describe('logger.ts', () => {
  let consoleSpy: {
    log: ReturnType<typeof vi.spyOn>;
    warn: ReturnType<typeof vi.spyOn>;
    error: ReturnType<typeof vi.spyOn>;
  };
  let originalLogLevel: LogLevel;

  beforeEach(() => {
    originalLogLevel = getLogLevel();
    consoleSpy = {
      log: vi.spyOn(console, 'log').mockImplementation(() => {}),
      warn: vi.spyOn(console, 'warn').mockImplementation(() => {}),
      error: vi.spyOn(console, 'error').mockImplementation(() => {}),
    };
  });

  afterEach(() => {
    setLogLevel(originalLogLevel);
    consoleSpy.log.mockRestore();
    consoleSpy.warn.mockRestore();
    consoleSpy.error.mockRestore();
  });

  describe('LogLevel enum', () => {
    it('should have correct numeric values', () => {
      expect(LogLevel.ERROR).toBe(0);
      expect(LogLevel.WARN).toBe(1);
      expect(LogLevel.INFO).toBe(2);
      expect(LogLevel.DEBUG).toBe(3);
    });
  });

  describe('setLogLevel and getLogLevel', () => {
    it('should set and get log level', () => {
      setLogLevel(LogLevel.DEBUG);
      expect(getLogLevel()).toBe(LogLevel.DEBUG);

      setLogLevel(LogLevel.ERROR);
      expect(getLogLevel()).toBe(LogLevel.ERROR);
    });
  });

  describe('createLogger', () => {
    it('should create a logger with context prefix', () => {
      setLogLevel(LogLevel.INFO);
      const logger = createLogger('TestContext');

      logger.info('test message');

      expect(consoleSpy.log).toHaveBeenCalledWith('[TestContext]', 'test message');
    });

    it('should log error at all log levels', () => {
      const logger = createLogger('Test');

      setLogLevel(LogLevel.ERROR);
      logger.error('error message');
      expect(consoleSpy.error).toHaveBeenCalledWith('[Test]', 'error message');
    });

    it('should log warn when level is WARN or higher', () => {
      const logger = createLogger('Test');

      setLogLevel(LogLevel.ERROR);
      logger.warn('warn message 1');
      expect(consoleSpy.warn).not.toHaveBeenCalled();

      setLogLevel(LogLevel.WARN);
      logger.warn('warn message 2');
      expect(consoleSpy.warn).toHaveBeenCalledWith('[Test]', 'warn message 2');
    });

    it('should log info when level is INFO or higher', () => {
      const logger = createLogger('Test');

      setLogLevel(LogLevel.WARN);
      logger.info('info message 1');
      expect(consoleSpy.log).not.toHaveBeenCalled();

      setLogLevel(LogLevel.INFO);
      logger.info('info message 2');
      expect(consoleSpy.log).toHaveBeenCalledWith('[Test]', 'info message 2');
    });

    it('should log debug only when level is DEBUG', () => {
      const logger = createLogger('Test');

      setLogLevel(LogLevel.INFO);
      logger.debug('debug message 1');
      expect(consoleSpy.log).not.toHaveBeenCalled();

      setLogLevel(LogLevel.DEBUG);
      logger.debug('debug message 2');
      expect(consoleSpy.log).toHaveBeenCalledWith('[Test]', '[DEBUG]', 'debug message 2');
    });

    it('should pass multiple arguments to log functions', () => {
      setLogLevel(LogLevel.DEBUG);
      const logger = createLogger('Multi');

      logger.info('message', { data: 'value' }, 123);
      expect(consoleSpy.log).toHaveBeenCalledWith('[Multi]', 'message', { data: 'value' }, 123);
    });
  });
});