To enable the test suite, make sure to configure CMake with -DBUILD_TESTING=1 , since it is disabled by default. The catch2 dependency will be downloaded during configure time. Also add a new target "tests-common", which includes unit tests for the "common" project. To finally run the tests use the "test" target. CircleCI: Run unit tests (cherry picked from commit 6a28ee7b2a4269aa7e43265d1cd0067537e3e883)