I want to use C++ to do Qt unit testing on Ubuntu system. What open source unit testing libraries are available?
Under the Ubuntu system, you can use multiple C++ unit testing frameworks to write Qt unit tests. The following are some common open source unit testing libraries:
1. Google Test: A C++ unit testing framework developed by Google. It is powerful and supports various test cases, test suites and assertions.
2. Boost.Test: A unit testing framework developed by Boost Community that supports the Boost C++ library and is scalable and flexible.
3. Catch2: A lightweight C++11 unit testing framework with rich functions and easy to use and integrate.
4. QTestLib: Qt’s own testing tool, suitable for unit testing of the Qt framework.
5. CppUnit: A C++ unit testing framework with object-oriented design and good encapsulation. It provides a variety of test cases and test suites to easily test C++ applications.
No matter which unit testing framework you choose, you can use the corresponding libraries to implement test-driven development (TDD) and test automation to improve software quality and reliability.
I want to use C++ to do Qt unit testing on the ubuntu system. Please help me find a common unit testing framework and give detailed usage tutorial examples.
Well, there are many commonly used testing frameworks for C++ Qt unit testing, the most common of which is the Google Test framework. The following is a detailed tutorial on writing Qt C++ unit tests using the Google Test framework based on the Ubuntu system:
## 1. Install Google Test framework
To install the Google Test framework on Ubuntu, you can use the following command:
```
sudo apt-get install libgtest-dev
```
The above command will install the library files and header files of the Google Test framework in the `/usr/src/gtest` directory.
After the installation is completed, switch to the `/usr/src/gtest` directory and compile the library files.
```
sudo apt-get install cmake # Install cmake compilation tool
cd /usr/src/gtest
sudo cmake CMakeLists.txt
sudo make # Compile library file
```
After successful compilation, the corresponding library file will be generated in the `/usr/lib` directory.
## 2. Create Qt unit test project
Create a new console application project in Qt Creator, named `MyTest`, select `Relaese` as the target file type, fill in the relevant information and path of the project, and create a project named `test in the project root directory ` subdirectory, used to store test code and test data.
## 3. Write test code
Create a new C++ file `mytest.cpp` in the `test` directory and write the test code. Here is a sample code:
```cpp
#include <gtest/gtest.h>
TEST(MyTest, TestCase1)
{
EXPECT_EQ(2 + 2, 4);
}
TEST(MyTest, TestCase2)
{
EXPECT_TRUE("hello" != "world");
}
```
The test code creates two test cases, testing the results of 2+2 equal to 4 and string comparison respectively.
The `TEST` macro definition is used to define a test case, which has two parameters: test case name and test case name. The `EXPECT_EQ` macro definition is used to test whether two values are equal, and the `EXPECT_TRUE` macro definition is used to test whether the result of an expression is true.
## 4. Write CMakeLists.txt file
Create a CMakeLists.txt file in the project root directory to configure and compile the test code, and link the Google Test framework library file. The following is a sample code:
```cmake
cmake_minimum_required(VERSION 3.5)
project(MyTest)
set(CMAKE_CXX_STANDARD 11)
#Add Google Test framework library file directory
link_directories(/usr/lib)
#Add test code directory
add_executable(MyTest test/mytest.cpp)
# Link to Google Test framework library file
target_link_libraries(MyTest pthread gtest)
````
This file configures the project's minimum CMake version, sets the C++ standard version, and adds the Google Test framework library file path to the link path. Then, add the test code directory to the compilation target and link the Google Test library file (note: you need to add the `-pthread` parameter when linking the library file).
## 5. Compile and run unit tests
Use the following command to enter the project root directory in the terminal window to create a folder named `build`, and then generate the Makefile in the folder:
```
mkdir build
cd build
cmake ../
```
After generating the Makefile, use the make command to compile:
```
make
```
After compilation is completed, run the `MyTest` program and you can see the test results:
```
./MyTest
```
The test results will be output in the console. If all test cases pass, the following will be output:
> [==========] Running 2 tests from 1 test case.
> [----------] Global test environment set-up.
> [----------] 2 tests from MyTest
> [ RUN ] MyTest.TestCase1
> [ OK ] MyTest.TestCase1 (0 ms)
> [ RUN ] MyTest.TestCase2
> [ OK ] MyTest.TestCase2 (0 ms)
> [----------] 2 tests from MyTest (0 ms total)
>
> [----------] Global test environment tear-down
> [==========] 2 tests from 1 test case ran. (0 ms total)
> [ PASSED ] 2 tests.
This completes the detailed tutorial on writing Qt C++ unit tests based on the Ubuntu system using the Google Test framework. I hope it will be helpful to you.