Meson provides introspection data to integrate your project into your IDE, for tasks such as building and running your project. To run all tests from all subprojects at once, search Meson: Run tests in the Terminal → Run Task... menu, or Ctrl+Shift+P → Meson: Run Unit Tests → all . The Meson VSCode extension exports that environment into a file that can be used by VSCode's launch.json file's envFile attribute.