在GTest中，如何检查非常接近0的数字? EXPECT_FLOAT_EQ不起作用

问题描述

我有一些代码可以计算(a)sin/(a)cos值，这些值预计非常接近0，但是当我说

I have some code that computes (a)sin/(a)cos values which are expected to be very close to 0, but when I say

EXPECT_FLOAT_EQ(my_computed_var, 0);

我收到如下错误:

/path/to/my/test.cpp:148: Failure
      Expected: my_computed_var
      Which is: 9.9920072e-16
      To be equal to: 0

我应该怎么做?对于其他数字，我也遇到这种类型的错误":-4.3711388e-08

How should I do this? I get this type of "error" for other numbers as well: -4.3711388e-08

寻找有关处理此类浮点错误的具体建议和一般信息.

Looking for both specific suggestions and general information about dealing with floating point error like this.

推荐答案

使用 EXPECT_NEAR 或 FloatEq 匹配器.

Use EXPECT_NEAR or the FloatEq matcher instead.

浮点宏表示EXPECT_FLOAT_EQ EXPECT_DOUBLE_EQ ASSERT_FLOAT_EQ和ASSERT_DOUBLE_EQ将进行验证

Floating-Point Macros said that EXPECT_FLOAT_EQ EXPECT_DOUBLE_EQ ASSERT_FLOAT_EQ and ASSERT_DOUBLE_EQ will verify

和:

ULP代表最后一个单元

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