GoogleTest 使用指南 ｜ 测试模板函数

GoogleTest 使用指南 ｜ 测试模板函数

min.h：

// min.h
#ifndef MIN_H
#define MIN_H

// 模板函数的声明和定义都放在头文件中
template <typename T>
T min(T a, T b) {
    return (a < b) ? a : b;
}

#endif // MIN_H

test_min.cpp：

#include "gtest/gtest.h"
#include "min.h"

// 使用类型化测试
template <typename T>
class MinFunctionTest : public ::testing::Test {};

typedef ::testing::Types<int, double, char> TestTypes;
TYPED_TEST_SUITE(MinFunctionTest, TestTypes);

TYPED_TEST(MinFunctionTest, ReturnSmaller) {
    TypeParam a = static_cast<TypeParam>(5);
    TypeParam b = static_cast<TypeParam>(3);
    EXPECT_EQ(min(a, b), b);
    EXPECT_EQ(min(b, a), b);
}

测试的执行结果：

"/Users/xiye/CppProjects/unit-test-example/out/build/Clang 17.0.0 arm64-apple-darwin24.6.0/test_min"
➜  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_min"
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 3 tests from 3 test suites.
[----------] Global test environment set-up.
[----------] 1 test from MinFunctionTest/0, where TypeParam = int
[ RUN      ] MinFunctionTest/0.ReturnSmaller
[       OK ] MinFunctionTest/0.ReturnSmaller (0 ms)
[----------] 1 test from MinFunctionTest/0 (0 ms total)

[----------] 1 test from MinFunctionTest/1, where TypeParam = double
[ RUN      ] MinFunctionTest/1.ReturnSmaller
[       OK ] MinFunctionTest/1.ReturnSmaller (0 ms)
[----------] 1 test from MinFunctionTest/1 (0 ms total)

[----------] 1 test from MinFunctionTest/2, where TypeParam = char
[ RUN      ] MinFunctionTest/2.ReturnSmaller
[       OK ] MinFunctionTest/2.ReturnSmaller (0 ms)
[----------] 1 test from MinFunctionTest/2 (0 ms total)

[----------] Global test environment tear-down
[==========] 3 tests from 3 test suites ran. (0 ms total)
[  PASSED  ] 3 tests.