类：MockTracker

¥Class: MockTracker

MockTracker 类用于管理模拟功能。测试运行器模块提供了一个顶层 mock 导出，它是一个 MockTracker 实例。每个测试还通过测试上下文的 mock 属性提供自己的 MockTracker 实例。

¥The MockTracker class is used to manage mocking functionality. The test runner module provides a top level mock export which is a MockTracker instance. Each test also provides its own MockTracker instance via the test context's mock property.