文章目录 1.简介 2.用法 1.简介 示例#2显示了一个具有多个成员的类的更复杂的单元测试功能 2.用法 CMakeLists.txt cmake_minimum_required(VERSION 3.0.0)project(hello_gtest VERSION 0.1.0)
文章目录
- 1.简介
- 2.用法
1.简介
示例#2显示了一个具有多个成员的类的更复杂的单元测试功能
2.用法
CMakeLists.txt
cmake_minimum_required(VERSION 3.0.0)project(hello_gtest VERSION 0.1.0)add_executable(${PROJECT_NAME} main.cc sample.cc sample_unitest.cc)target_link_libraries(${PROJECT_NAME} gtest pthread)main.cc
#include <gtest/gtest.h>int main(int argc, char *argv[]){ testing::InitGoogleTest(&argc, argv); return RUN_ALL_TESTS();}sample.h
#ifndef GOOGLETEST_SAMPLES_SAMPLE2_H_#define GOOGLETEST_SAMPLES_SAMPLE2_H_#include <string.h>// A simple string class.class MyString{private: const char *c_string_; const MyString &operator=(const MyString &rhs);public: // Clones a 0-terminated C string, allocating memory using new. static const char *CloneCString(const char *a_c_string); // // C'tors // The default c'tor constructs a NULL string. MyString() : c_string_(nullptr) {} // Constructs a MyString by cloning a 0-terminated C string. explicit MyString(const char *a_c_string) : c_string_(nullptr) { Set(a_c_string); } // Copy c'tor MyString(const MyString &string) : c_string_(nullptr) { Set(string.c_string_); } // // D'tor. MyString is intended to be a final class, so the d'tor // doesn't need to be virtual. ~MyString() { delete[] c_string_; } // Gets the 0-terminated C string this MyString object represents. const char *c_string() const { return c_string_; } size_t Length() const { return c_string_ == nullptr ? 0 : strlen(c_string_); } // Sets the 0-terminated C string this MyString object represents. void Set(const char *c_string);};#endif // GOOGLETEST_SAMPLES_SAMPLE2_H_sample.cc
#include "sample.h"#include <string.h>// Clones a 0-terminated C string, allocating memory using new.const char *MyString::CloneCString(const char *a_c_string){ if (a_c_string == nullptr) return nullptr; const size_t len = strlen(a_c_string); char *const clone = new char[len + 1]; memcpy(clone, a_c_string, len + 1); return clone;}// Sets the 0-terminated C string this MyString object// represents.void MyString::Set(const char *a_c_string){ // Makes sure this works when c_string == c_string_ const char *const temp = MyString::CloneCString(a_c_string); delete[] c_string_; c_string_ = temp;}sample_unitest.cc
// A sample program demonstrating using Google C++ testing framework.// This sample shows how to write a more complex unit test for a class// that has multiple member functions.//// Usually, it's a good idea to have one test for each method in your// class. You don't have to do that exactly, but it helps to keep// your tests organized. You may also throw in additional tests as// needed.#include "sample.h"#include "gtest/gtest.h"namespace{ // In this example, we test the MyString class (a simple string). // Tests the default c'tor. TEST(MyString, DefaultConstructor) { const MyString s; // Asserts that s.c_string() returns NULL. // // <TechnicalDetails> // // If we write NULL instead of // // static_cast<const char *>(NULL) // // in this assertion, it will generate a warning on gcc 3.4. The // reason is that EXPECT_EQ needs to know the types of its // arguments in order to print them when it fails. Since NULL is // #defined as 0, the compiler will use the formatter function for // int to print it. However, gcc thinks that NULL should be used as // a pointer, not an int, and therefore complains. // // The root of the problem is C++'s lack of distinction between the // integer number 0 and the null pointer constant. Unfortunately, // we have to live with this fact. // // </TechnicalDetails> EXPECT_STREQ(nullptr, s.c_string()); EXPECT_EQ(0u, s.Length()); } const char kHelloString[] = "Hello, world!"; // Tests the c'tor that accepts a C string. TEST(MyString, ConstructorFromCString) { const MyString s(kHelloString); EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); EXPECT_EQ(sizeof(kHelloString) / sizeof(kHelloString[0]) - 1, s.Length()); } // Tests the copy c'tor. TEST(MyString, CopyConstructor) { const MyString s1(kHelloString); const MyString s2 = s1; EXPECT_EQ(0, strcmp(s2.c_string(), kHelloString)); } // Tests the Set method. TEST(MyString, Set) { MyString s; s.Set(kHelloString); EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); // Set should work when the input pointer is the same as the one // already in the MyString object. s.Set(s.c_string()); EXPECT_EQ(0, strcmp(s.c_string(), kHelloString)); // Can we set the MyString to NULL? s.Set(nullptr); EXPECT_STREQ(nullptr, s.c_string()); }} // namespace- ref：gtest sample