test(logger): cover production info defaults

Co-authored-by: Theodore Li <TheodoreSpeaks@users.noreply.github.com>

Author: cursoragent

packages/logger/src/index.test.ts

@@ -99,6 +99,86 @@ describe('Logger', () => {
     })
   })
 
+  describe('environment-based log levels', () => {
+    const env = process.env
+    const globalRecord = globalThis as Record<string, unknown>
+    let originalNodeEnv: string | undefined
+    let originalLogLevel: string | undefined
+    let hadWindow: boolean
+    let originalWindow: unknown
+
+    beforeEach(() => {
+      originalNodeEnv = env.NODE_ENV
+      originalLogLevel = env.LOG_LEVEL
+      hadWindow = Object.prototype.hasOwnProperty.call(globalRecord, 'window')
+      originalWindow = globalRecord.window
+    })
+
+    afterEach(() => {
+      if (originalNodeEnv === undefined) {
+        delete env.NODE_ENV
+      } else {
+        env.NODE_ENV = originalNodeEnv
+      }
+
+      if (originalLogLevel === undefined) {
+        delete env.LOG_LEVEL
+      } else {
+        env.LOG_LEVEL = originalLogLevel
+      }
+
+      if (hadWindow) {
+        globalRecord.window = originalWindow
+      } else {
+        delete globalRecord.window
+      }
+    })
+
+    test('logs info by default in production on server', () => {
+      env.NODE_ENV = 'production'
+      delete env.LOG_LEVEL
+
+      const logger = createLogger('ProdServer')
+      logger.debug('debug message')
+      logger.info('info message')
+
+      expect(consoleLogSpy).toHaveBeenCalledTimes(1)
+      expect(consoleLogSpy).toHaveBeenCalledWith(
+        expect.stringContaining('[INFO] [ProdServer]'),
+        'info message'
+      )
+    })
+
+    test('respects LOG_LEVEL override in production', () => {
+      env.NODE_ENV = 'production'
+      env.LOG_LEVEL = LogLevel.ERROR
+
+      const logger = createLogger('ProdOverride')
+      logger.info('suppressed info')
+      logger.error('error message')
+
+      expect(consoleLogSpy).not.toHaveBeenCalled()
+      expect(consoleErrorSpy).toHaveBeenCalledTimes(1)
+      expect(consoleErrorSpy).toHaveBeenCalledWith(
+        expect.stringContaining('[ERROR] [ProdOverride]'),
+        'error message'
+      )
+    })
+
+    test('does not log in production browser runtime', () => {
+      env.NODE_ENV = 'production'
+      delete env.LOG_LEVEL
+      globalRecord.window = {}
+
+      const logger = createLogger('ProdBrowser')
+      logger.info('hidden info')
+      logger.error('hidden error')
+
+      expect(consoleLogSpy).not.toHaveBeenCalled()
+      expect(consoleErrorSpy).not.toHaveBeenCalled()
+    })
+  })
+
   describe('object formatting', () => {
     test('should handle null and undefined arguments', () => {
       const logger = createLogger('TestModule')