Question

我们如何使用ASSERT_NEAR或ASSERT_DOUBLE_EQ浮动比较而不使用googletest内部的谓词格式化函数？

template<typename A, typename B>
::testing::AssertionResult assertNearArrays(const char * a_expr,
                                              const char * b_expr,
                                              const A & a,
                                              const B & b,
                                              PREC absError = 1e-6){

      test each value of a with b
      using ASSERT_NEAR(a[i],b[i], 1e-6)
 }

我觉得这不会奏效，我需要写一个自己的比较来回复AssertionResult或AssertionFailure。但依靠googletest而不是我自己的浮点数比较会很好......？

Answer 1

您只能在几行C ++代码中编写此类测试：

template<typename T>    
bool is_near(T val1, T val2, T abs_error) {
  const T diff = std::abs(val1 - val2);
  return  diff <= abs_error:
}

你真的需要完全遵循gtest ASSERT_NEAR的作用吗？您可能希望在失败时提供有关ASSERT_NEAR将执行的添加信息，例如：

  if (!is_near(a[i], b[i], absError))
    return AssertionFailure()
      << "The difference between a[i] and b[i]"
      << " is " << (a[i] - b[i]) << ", which exceeds absError, where\n"
      << "a[i] evaluates to " << a[i] << ",\n"
      << "b[i] evaluates to " << b[i]<< ", and\n"
      << "absError evaluates to " << absError << ", and\n"
      << "i evaluates to " << i << ".";

并且返回AssertionSuccess（）;在assertNearArrays的末尾

是否可以在googletest中的Predicate Formatter中使用ASSERT_NEAR

1 个答案: