Override expectations: can set default expectations in a fixture setup, and override as needed on tests.

重载期望：可以在全局设置时给Mock方法设置缺省的期望，在测试方法中可以根据需要对它进行重载。

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Based on the part surface errors and fixture setup errors, locating error model of three-dimensional part is built.

基于定位点处的尺寸偏差，建立了三维零件的定位误差模型。

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The setUp function provides the test author with his or her opportunity to optionally construct a test fixture.

setUp函数给测试者提供了一个机会， 可以选择在此构造测试夹具（test fixture）。

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