具有Bazel和GTest的C ++项目 [英] C++ project with Bazel and GTest

问题描述

我想使用gtest创建一个用于单元测试的Bazel C ++项目.

I want to create a Bazel C++ project with gtest for unit tests.

最小设置是什么?

(我的计算机上仅安装了 Bazel ，并且我在Linux下运行)

(I only have Bazel installed on my computer and I am running under Linux)

推荐答案

项目结构为:

.
├── bin
│   ├── BUILD
│   ├── hello.cpp
├── MyLib
│   ├── BUILD
│   ├── message.hpp
│   ├── message.cpp
│   ├── ... 
├── test
│   ├── BUILD
│   ├── message_test.cpp
│   ├── ... 
├── gmock.BUILD
└── WORKSPACE

与Bazel + GTest相关的文件

• WORKSPACE

您从github下载了gtest:

There you download gtest from github:

new_git_repository(
    name = "googletest",
    build_file = "gmock.BUILD",
    remote = "https://github.com/google/googletest",
    tag = "release-1.8.0",
)

您定义了以下定义的gmock BUILD文件:

You define a gmock BUILD file defined below:

• gmock.BUILD

此BUILD文件负责编译gtest/gmock:

This BUILD file is in charge of compiling gtest/gmock:

cc_library(
      name = "gtest",
      srcs = [
            "googletest/src/gtest-all.cc",
            "googlemock/src/gmock-all.cc",
      ],
      hdrs = glob([
          "**/*.h",
          "googletest/src/*.cc",
          "googlemock/src/*.cc",
      ]),
      includes = [
          "googlemock",
          "googletest",
          "googletest/include",
          "googlemock/include",
      ],
      linkopts = ["-pthread"],
      visibility = ["//visibility:public"],
  )

  cc_library(
      name = "gtest_main",
      srcs = ["googlemock/src/gmock_main.cc"],
      linkopts = ["-pthread"],
      visibility = ["//visibility:public"],
      deps = [":gtest"],
  )

• 测试/构建
• test/BUILD

此构建文件生成测试:

cc_test(
    name = "MyTest",
    srcs = glob(["**/*.cpp"]),
    deps = ["//MyLib:MyLib",
           "@googletest//:gtest_main"],
)

test/message_test.cpp 文件的定义如下:

#include "gtest/gtest.h"

#include "MyLib/message.hpp"

TEST(message_test,content)
{
  EXPECT_EQ(get_message(),"Hello World!");
}

仅此而已！其他文件的定义与往常一样:

And that is all! The other files are defined as usual:

支持示例的文件

• MyLib/BUILD

创建 libMyLib.so 和 libMyLib.a 库.

cc_library(
    name="MyLib",
    hdrs=glob(["**/*.hpp"]),
    srcs=glob(["**/*.cpp"]),
    visibility = ["//visibility:public"],
)

带有基本的 message.hpp

#include <string>

std::string get_message();

和 message.cpp

#include "MyLib/message.hpp"

std::string get_message()
{
   return "Hello World!";
}

示例.

• bin/BUILD

创建 hello 可执行文件.

cc_binary(
    name = "hello",
    srcs = ["hello.cpp"],
    deps = ["//MyLib:MyLib"],
)

这是:

#include "MyLib/message.hpp"

#include <iostream>

int main()
{
  std::cout << "\n" << get_message() << std::endl;

  return EXIT_SUCCESS;
}

用法:

• 编译所有目标:

这还将从其github存储库中下载gtest并进行编译

This will also download gtest from its github repo and compile it

bazel build ...

• 检查问候目标:

您可以通过以下方式运行它:

You can run it with:

bazel run bin:hello

• 使用GTest运行测试

这是本笔记的重点:

bazel test ... --test_output=errors

您应该得到类似的东西:

You should get something like:

INFO: Analysed 3 targets (0 packages loaded).
INFO: Found 2 targets and 1 test target...
INFO: Elapsed time: 0.205s, Critical Path: 0.05s
INFO: Build completed successfully, 2 total actions
//test:MyTest   
PASSED in 0.0s
Executed 1 out of 1 test: 1 test passes.

再现结果

为了您的方便，我创建了一个包含此示例的 github存储库.我希望它能开箱即用.

For your ease I have created a github repo containing this example. I hope it works out of the box.

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