Code coverage tools give you one way to measure test completeness.
代码覆盖工具为您提供了一种度量测试完整性的方法。
If you don't measure your test coverage, you will keep running your tests and seeing them pass and never know your coverage level (and thus the value of the test runs) is deteriorating.
如果您不度量您测试的覆盖范围，您会继续运行您的测试并看到它们都通过测试，但是从来不会知道您的覆盖水平(因此这个测试运行的价值)正在恶化。
Many tools are available in the market to measure the test coverage.
市场上许多测试工具都可以度量测试覆盖率的。
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