c++ - GTest，仅参数化测试用例

Question

我想应用参数化测试并具有以下夹具:

class MyTest: public ::testing::TestWithParam<float> {...};

我想设置两个参数化测试用例，其中一个小参数失败，但大参数成功。

TEST_P(MyTest, smallParamsFail)
{
    auto param = GetParam();
    EXPECT_EQ(true, param<1);
}


TEST_P(MyTest, largeParamsSucceed)
{
    auto param = GetParam();
    EXPECT_EQ(true, param>1);
}

我现在想开始测试用例 smallParamsFail，其中一个值较小，另一个值较大。不幸的是，我只能像这样参数化整个测试:

INSTANTIATE_TEST_CASE_P(
    testLargeParams,
    MyTest,
    ::testing::Values(2.0f, 3.14f));

这将执行两个测试用例，并且显然会在 smallParamsFail 情况下崩溃。我需要的是仅在测试用例 largeParamsSucceed 上使用参数 2.0f、3.14f 实例化 MyTest。然后使用适当的参数以相同的方式启动另一个案例。

Answer 1

这在 GTest 中是不可能的，正如 yksisarvinen 的评论中已经提到的那样.

我将使用以下解决方法

class MyTestBase: public ::testing::TestWithParam<float> {
protected:
    MyTestBase() {
        // whatever
    }
    // whatever
    int someParam_;
};

class MyTestForSmall: public MyTestBase {
};

class MyTestForBig: public MyTestBase {
};

TEST_P(MyTestForSmall, smallParamsFail) {
    auto param = GetParam();
    EXPECT_EQ(true, param<1);
}

TEST_P(MyTestForBig, largeParamsSucceed) {
    auto param = GetParam();
    EXPECT_EQ(true, param>1);
}

TEST_P(MyTestBase, someGeneralTest) {
    auto param = GetParam();
    EXPECT_TRUE(true);
}

INSTANTIATE_TEST_CASE_P(
    testSmallParams,
    MyTestForSmall,
    ::testing::Values(0.1, 0.2));

INSTANTIATE_TEST_CASE_P(
    testLargeParams,
    MyTestForBig,
    ::testing::Values(2.0f, 3.14f));

INSTANTIATE_TEST_CASE_P(
    allKindsOfParams,
    MyTestBase,
    ::testing::Values(0.1, 0.2, 2.0f, 3.14f));

在基类中，您可以设置所有必要的环境，并仅使用子类进行测试参数分离。

可能的输出:

[----------] 2 tests from testSmallParams/MyTestForSmall
[ RUN      ] testSmallParams/MyTestForSmall.smallParamsFail/0
[       OK ] testSmallParams/MyTestForSmall.smallParamsFail/0 (0 ms)
[ RUN      ] testSmallParams/MyTestForSmall.smallParamsFail/1
[       OK ] testSmallParams/MyTestForSmall.smallParamsFail/1 (0 ms)
[----------] 2 tests from testSmallParams/MyTestForSmall (0 ms total)

[----------] 2 tests from testLargeParams/MyTestForBig
[ RUN      ] testLargeParams/MyTestForBig.largeParamsSucceed/0
[       OK ] testLargeParams/MyTestForBig.largeParamsSucceed/0 (0 ms)
[ RUN      ] testLargeParams/MyTestForBig.largeParamsSucceed/1
[       OK ] testLargeParams/MyTestForBig.largeParamsSucceed/1 (0 ms)
[----------] 2 tests from testLargeParams/MyTestForBig (0 ms total)

[----------] 4 tests from allKindsOfParams/MyTestBase
[ RUN      ] allKindsOfParams/MyTestBase.someGeneralTest/0
[       OK ] allKindsOfParams/MyTestBase.someGeneralTest/0 (0 ms)
[ RUN      ] allKindsOfParams/MyTestBase.someGeneralTest/1
[       OK ] allKindsOfParams/MyTestBase.someGeneralTest/1 (0 ms)
[ RUN      ] allKindsOfParams/MyTestBase.someGeneralTest/2
[       OK ] allKindsOfParams/MyTestBase.someGeneralTest/2 (0 ms)
[ RUN      ] allKindsOfParams/MyTestBase.someGeneralTest/3
[       OK ] allKindsOfParams/MyTestBase.someGeneralTest/3 (0 ms)
[----------] 4 tests from allKindsOfParams/MyTestBase (0 ms total)