Fix: How to run CTest with coverage by Visual Studio 2019 from the command line?

 To run CTest with coverage by Visual Studio 2019 from the command line, you can use the `ctest` command and specify code coverage options. Here are the steps to achieve this:


1. **Generate Code Coverage Data**:

   Before running CTest with coverage, you need to ensure that your CMake configuration generates code coverage data. You can do this by adding the following lines to your `CMakeLists.txt`:


   ```cmake

   set(CMAKE_CXX_FLAGS "--coverage")

   set(CMAKE_C_FLAGS "--coverage")

   set(CMAKE_EXE_LINKER_FLAGS "--coverage")

   ```


   These flags will enable code coverage instrumentation.


2. **Build Your Project**:

   Make sure you build your project with these new CMake settings. You can use `cmake` to configure and `cmmake --build` to build your project:


   ```bash

   cmake --build . --config Release

   ```


3. **Run Tests with CTest**:

   After building, you can use CTest to run your tests:


   ```bash

   ctest

   ```


   Ensure that your tests include both unit tests and any additional tests you want to measure for code coverage.


4. **Collect Code Coverage Data**:

   After running your tests with CTest, code coverage data will be collected. You can find the coverage data files in the `Testing/Temporary` directory.


5. **Generate Code Coverage Report**:

   To generate a code coverage report, you can use the `lcov` tool. If it's not installed, you may need to install it on your system.


   ```bash

   lcov --capture --directory . --output-file coverage.info

   genhtml coverage.info --output-directory coverage-report

   ```


   This will generate a code coverage report in the `coverage-report` directory.


6. **View the Code Coverage Report**:

   You can now open the generated HTML report in a web browser to view the code coverage details:


   ```bash

   open coverage-report/index.html

   ```


This process assumes that you have configured your project for CMake and Visual Studio, and you are using a compatible compiler with code coverage support. Note that Visual Studio 2019 does not have built-in support for code coverage reports, so you'll need to use external tools like `lcov` to generate and view the reports.

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