GoogleTest 使用指南 ｜ 测试私有静态方法

GoogleTest 使用指南 ｜ 测试私有静态方法

新建一个测试访问类，使用测试访问类作为友元。

即可将测试对象的私有静态方法，通过测试访问类的公共方法间接调用。

utility.h：

class Utility {
private:
    static int PrivateStaticMethod(int x) {
        return x * 2;
    }
    
    // 使用测试类作为友元
    friend class UtilityTestAccess;
};

// 测试访问类
class UtilityTestAccess {
public:
    static int CallPrivateMethod(int x) {
        return Utility::PrivateStaticMethod(x);
    }
};

test_utility.cpp：

#include "gtest/gtest.h"
#include "utility.h"

TEST(UtilityTest, PrivateStaticMethod) {
    EXPECT_EQ(UtilityTestAccess::CallPrivateMethod(5), 10);
    EXPECT_EQ(UtilityTestAccess::CallPrivateMethod(0), 0);
    EXPECT_EQ(UtilityTestAccess::CallPrivateMethod(-1), -2);
}

测试输出：

"/Users/xiye/CppProjects/unit-test-example/out/build/Clang 17.0.0 arm64-apple-darwin24.6.0/test_utility"
➜  Clang 17.0.0 arm64-apple-darwin24.6.0 "/Users/xiye/CppProjects/unit-test-example/out/build/Clang 17.0.0 arm64-apple-darwin24.6.0/test_utility"
Running main() from /Users/xiye/CppProjects/unit-test-example/out/build/Clang 17.0.0 arm64-apple-darwin24.6.0/_deps/googletest-src/googletest/src/gtest_main.cc
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from UtilityTest
[ RUN      ] UtilityTest.PrivateStaticMethod
[       OK ] UtilityTest.PrivateStaticMethod (0 ms)
[----------] 1 test from UtilityTest (0 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[  PASSED  ] 1 test.