如何使用GNU Make项目设置Google Test？

Question

由于Google Test网页基本上没有文档 - 我该怎么做？我到目前为止做了什么:

• 我从项目页面下载了googletest 1.6并在./configure && make里面做了一个
• 我添加-Igtest/include -Lgtest/lib到我的编译器/链接器标志

• 我写了一个小样本测试:

  #include "gtest/gtest.h"
  
  int main(int argc, char **args)
  {
    return 0;
  }
  
  TEST(someTest,testOne)
  {
    ASSERT_EQ(5,5);
  }
  

  这编译很好,但链接器似乎根本没有被逗乐.我收到了大量的错误信息

  test/main.o:在函数test someTest_testOne_Test::TestBody()': main.cpp:(.text+0x96): undefined reference to:: internal :: AssertHelper :: AssertHelper(testing :: TestPartResult :: Type,char const*,int,char const*)'

现在我忘记了做什么？

Answer 1

作为参考，我有一个docker系统设置，g++并且gtest可以正常工作。我在这里提供所有文件以供将来参考：

Dockerfile

FROM gcc:9.2.0

WORKDIR /usr/src/app

RUN apt-get -qq update \
    && apt-get -qq install --no-install-recommends cmake \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

RUN git clone --depth=1 -b master https://github.com/google/googletest.git
RUN mkdir googletest/build

WORKDIR /usr/src/app/googletest/build

RUN cmake .. \
    && make \
    && make install \
    && rm -rf /usr/src/app/googletest

WORKDIR /usr/src/app

COPY . .
RUN mkdir obj

RUN make

CMD [ "./main" ]

生成文件

CXX = g++
CXXFLAGS = -std=c++17 -Wall -I h -I /usr/local/include/gtest/ -c
LXXFLAGS = -std=c++17 -I h -pthread
OBJECTS = ./obj/program.o ./obj/main.o ./obj/program_unittest.o
GTEST = /usr/local/lib/libgtest.a
TARGET = main


$(TARGET): $(OBJECTS)
    $(CXX) $(LXXFLAGS) -o $(TARGET) $(OBJECTS) $(GTEST)
./obj/program.o: ./cpp/program.cpp
    $(CXX) $(CXXFLAGS) ./cpp/program.cpp -o ./obj/program.o
./obj/program_unittest.o: ./cpp/program_unittest.cpp
    $(CXX) $(CXXFLAGS) ./cpp/program_unittest.cpp -o ./obj/program_unittest.o
./obj/main.o: ./cpp/main.cpp
    $(CXX) $(CXXFLAGS) ./cpp/main.cpp -o ./obj/main.o
clean:
    rm -fv $(TARGET) $(OBJECTS)

cpp/maincpp

#include <iostream>
#include "program.h"
#include "gtest/gtest.h"

int main(int argc, char **argv)
{
    ::testing::InitGoogleTest(&argc, argv);
    std::cout << "RUNNING TESTS ..." << std::endl;
    int ret{RUN_ALL_TESTS()};
    if (!ret)
        std::cout << "<<<SUCCESS>>>" << std::endl;
    else
        std::cout << "FAILED" << std::endl;
    return 0;
}

cpp/程序.cpp

#include "program.h"

// Returns n! (the factorial of n).  For negative n, n! is defined to be 1.
int Factorial(int n)
{
    int result = 1;
    for (int i = 1; i <= n; i++)
    {
        result *= i;
    }

    return result;
}

// Returns true if and only if n is a prime number.
bool IsPrime(int n)
{
    // Trivial case 1: small numbers
    if (n <= 1)
        return false;

    // Trivial case 2: even numbers
    if (n % 2 == 0)
        return n == 2;

    // Now, we have that n is odd and n >= 3.

    // Try to divide n by every odd number i, starting from 3
    for (int i = 3;; i += 2)
    {
        // We only have to try i up to the square root of n
        if (i > n / i)
            break;

        // Now, we have i <= n/i < n.
        // If n is divisible by i, n is not prime.
        if (n % i == 0)
            return false;
    }

    // n has no integer factor in the range (1, n), and thus is prime.
    return true;
}

cpp/program_unittest.cpp

#include <limits.h>
#include "program.h"
#include "gtest/gtest.h"
namespace
{

// Tests Factorial().

// Tests factorial of negative numbers.
TEST(FactorialTest, Negative)
{
    // This test is named "Negative", and belongs to the "FactorialTest"
    // test case.
    EXPECT_EQ(1, Factorial(-5));
    EXPECT_EQ(1, Factorial(-1));
    EXPECT_GT(Factorial(-10), 0);

}

// Tests factorial of 0.
TEST(FactorialTest, Zero)
{
    EXPECT_EQ(1, Factorial(0));
}

// Tests factorial of positive numbers.
TEST(FactorialTest, Positive)
{
    EXPECT_EQ(1, Factorial(1));
    EXPECT_EQ(2, Factorial(2));
    EXPECT_EQ(6, Factorial(3));
    EXPECT_EQ(40320, Factorial(8));
}

// Tests IsPrime()

// Tests negative input.
TEST(IsPrimeTest, Negative)
{
    // This test belongs to the IsPrimeTest test case.

    EXPECT_FALSE(IsPrime(-1));
    EXPECT_FALSE(IsPrime(-2));
    EXPECT_FALSE(IsPrime(INT_MIN));
}

// Tests some trivial cases.
TEST(IsPrimeTest, Trivial)
{
    EXPECT_FALSE(IsPrime(0));
    EXPECT_FALSE(IsPrime(1));
    EXPECT_TRUE(IsPrime(2));
    EXPECT_TRUE(IsPrime(3));
}

// Tests positive input.
TEST(IsPrimeTest, Positive)
{
    EXPECT_FALSE(IsPrime(4));
    EXPECT_TRUE(IsPrime(5));
    EXPECT_FALSE(IsPrime(6));
    EXPECT_TRUE(IsPrime(23));
}

h/程序.h

#ifndef GTEST_PROGRAM_H_
#define GTEST_PROGRAM_H_

// Returns n! (the factorial of n).  For negative n, n! is defined to be 1.
int Factorial(int n);

// Returns true if and only if n is a prime number.
bool IsPrime(int n);

#endif // GTEST_PROGRAM_H_

cpp/program.cpp文件h/program.h来自googletest存储库示例 1。Dockerfile改编自这里。

Answer 2

最好的示例 Makefile 是随 Google Test 一起发布的。它向您展示了如何根据您想要使用 Google 的功能还是您自己的功能来链接gtest_main.a或链接您的二进制文件。gtest.amain()