C++ 如何在具有多个TEST.cpp的头文件中使用实例化_TEST_CASE_P？

假设我在头文件fixtures.h中定义了一个GTest fixture：

 class baseFixture : public ::testing::Test{
   // some shared functionality among tests
 }

以及允许某些参数化的衍生夹具：

class derivedFixture: public baseFixture, 
  public ::testing::WithParamInterface<std::tuple<bool, int>>{};

---

为了运行{true，false}和{1}的叉积的测试集。当我只编译一个cpp文件，将其命名为N1.cpp并运行可执行文件时，我通过

TEST\P获得了正确的行为（derivedFixture*

测试-每个测试运行两次。但是，当我构建整个项目并执行测试时，每个测试都会运行2*N次。我在头文件中使用了include-guard来防止实例化宏被调用两次，我确信我不会在其他任何地方调用它。

您所做的基本上是这样的：

fixture.hpp（1）

当您期望4个测试时，您会看到8个测试，每个

实例化一个/fixture.test\u a/N

在{0,1}中运行两次

错误在于：我们做：

INSTANTIATE_TEST_CASE_P(instantiation_one, fixture,
  ::testing::Combine(::testing::Bool(), ::testing::Values(1)));

在

fixture.hpp

，即

#包括
-ed，因此在每个
翻译单元
tN.cpp
，导致注册的2个参数化测试
通过此代码，可以在运行时注册
N次
，从而运行N次

我们应该编译一个值参数化装置的每个实例
对于给定的一组值，只需执行一次，因此只需在一个源文件中执行该操作，例如

fixture.hpp（2）

也许我对翻译单位有误解。我认为fixture.hpp中的#ifndef卫士会导致宏只运行一次。既然不是这样，为什么它会运行多次？@PhilipDakin Hi。头卫士会阻止
foo.h
的内容被预处理和编译多次，不管它被预处理和编译多少次
#include
s
foo.h
。如果您编译了N个翻译单元，每个
#包含foo.h
，并成功地将N个目标文件链接到一个程序中，则编译
foo.h
内容后在目标文件中生成的任何代码都将链接到该程序中N次。
#ifndef FIXTURE_HPP
#define FIXTURE_HPP

#include <gtest/gtest.h>

struct fixture: ::testing::TestWithParam<std::tuple<bool, int>>
{};

INSTANTIATE_TEST_CASE_P(instantiation_one, fixture,
  ::testing::Combine(::testing::Bool(), ::testing::Values(1)));

#endif

#include "fixture.hpp"
#include <tuple>

TEST_P(fixture, test_a)
{
    auto const & param = GetParam();
    std::cout << "param 0 = " << std::get<0>(param) << std::endl;
    std::cout << "param 1 = " << std::get<1>(param) << std::endl;
    SUCCEED();
}

#include "fixture.hpp"
#include <tuple>

TEST_P(fixture, test_b)
{
    auto const & param = GetParam();
    std::cout << "param 0 = " << std::get<0>(param) << std::endl;
    std::cout << "param 1 = " << std::get<1>(param) << std::endl;
    SUCCEED();
}

#include <gtest/gtest.h>

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

$ ./gtester
[==========] Running 8 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 8 tests from instantiation_one/fixture
[ RUN      ] instantiation_one/fixture.test_a/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/0 (0 ms)
[ RUN      ] instantiation_one/fixture.test_a/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/1 (0 ms)
[ RUN      ] instantiation_one/fixture.test_a/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/0 (0 ms)
[ RUN      ] instantiation_one/fixture.test_a/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/1 (0 ms)
[ RUN      ] instantiation_one/fixture.test_b/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/0 (0 ms)
[ RUN      ] instantiation_one/fixture.test_b/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/1 (0 ms)
[ RUN      ] instantiation_one/fixture.test_b/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/0 (0 ms)
[ RUN      ] instantiation_one/fixture.test_b/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/1 (0 ms)
[----------] 8 tests from instantiation_one/fixture (0 ms total)

[----------] Global test environment tear-down
[==========] 8 tests from 1 test case ran. (1 ms total)
[  PASSED  ] 8 tests.

INSTANTIATE_TEST_CASE_P(instantiation_one, fixture,
  ::testing::Combine(::testing::Bool(), ::testing::Values(1)));

#ifndef FIXTURE_HPP
#define FIXTURE_HPP

#include <gtest/gtest.h>

struct fixture: ::testing::TestWithParam<std::tuple<bool, int>>
{};


#endif

#include <gtest/gtest.h>
#include "fixture.hpp"

INSTANTIATE_TEST_CASE_P(instantiation_one, fixture,
  ::testing::Combine(::testing::Bool(), ::testing::Values(1)));

int main(int argc, char **argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}

$ g++ -Wall -Wextra -c main.cpp t1.cpp t2.cpp
$ g++ -o gtester main.o t1.o t2.o -lgtest -pthread
$ ./gtester
[==========] Running 4 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 4 tests from instantiation_one/fixture
[ RUN      ] instantiation_one/fixture.test_a/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/0 (0 ms)
[ RUN      ] instantiation_one/fixture.test_a/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_a/1 (0 ms)
[ RUN      ] instantiation_one/fixture.test_b/0
param 0 = 0
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/0 (1 ms)
[ RUN      ] instantiation_one/fixture.test_b/1
param 0 = 1
param 1 = 1
[       OK ] instantiation_one/fixture.test_b/1 (0 ms)
[----------] 4 tests from instantiation_one/fixture (1 ms total)

[----------] Global test environment tear-down
[==========] 4 tests from 1 test case ran. (1 ms total)
[  PASSED  ] 4 tests.