为Google测试装置指定构造函数参数 [英] Specify constructor arguments for a Google test Fixture

问题描述

对于Google测试，我想指定一个测试夹具，以用于不同的测试案例。
固定装置应分配和取消分配 TheClass 类及其数据管理类 TheClassData 的对象，其中数据管理类需要一个数据文件的名称。

对于不同的测试，文件名应该有所不同。

With Google test I want to specify a Test fixture for use in different test cases. The fixture shall allocate and deallocate objects of the class TheClass and its data management class TheClassData, where the data management class requires the name of a datafile.
For the different tests, the file name should vary.

我定义了以下夹具： / p>

I defined the following Fixture:

class TheClassTest : public ::testing::Test {
 protected:
  TheClassTest(std::string filename) : datafile(filename) {}
  virtual ~TheClassTest() {}
  virtual void SetUp() {
    data = new TheClassData(datafile);
    tc = new TheClass(data);
  }
  virtual void TearDown() {
    delete tc;
    delete data;
  }

  std::string datafile;
  TheClassData* data;
  TheClass* tc;
};

现在，不同的测试应使用具有不同文件名的灯具。
想象一下，这是建立测试环境。

Now, different tests should use the fixture with different file names. Imagine this as setting up a test environment.

问题：如何从测试中指定文件名，即如何调用夹具的非默认构造函数？

The question: How can I specify the filename from a test, i.e. how to call a non-default constructor of a fixture?

我发现类似 :: testing :: TestWithParam< T> 和 TEST_P 都无济于事，因为我不想使用不同的值运行一项测试，而是使用一种夹具来运行不同的测试。

I found things like ::testing::TestWithParam<T> and TEST_P, which doesn't help, as I don't want to run one test with different values, but different tests with one fixture.

推荐答案

如另一个用户所建议，您无法通过使用非默认构造函数实例化夹具来实现所需的
。但是，
还有其他方法。只需重载 SetUp 函数，然后
在测试中显式调用该版本：

As suggested by another user, you cannot achieve what you want by instantiating a fixture using a non-default constructor. However, there are other ways. Simply overload the SetUp function and call that version explicitly in the tests:

class TheClassTest : public ::testing::Test {
protected:
    TheClassTest() {}
    virtual ~TheClassTest() {}
    void SetUp(const std::string &filename) {
        data = new TheClassData(filename);
        tc = new TheClass(data);
    }
    virtual void TearDown() {
        delete tc;
        delete data;
    }

    TheClassData* data;
    TheClass* tc;
};

现在在测试中只需使用此重载来设置文件名：

Now in the test simply use this overload to set up filename:

TEST_F(TheClassTest, MyTestCaseName)
{
    SetUp("my_filename_for_this_test_case");

    ...
}

无参数将在
测试完成时自动清理。

The parameterless TearDown will automatically clean up when the test is complete.

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