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The tests have effectively been disabled in the CI as Catch2 was not installed on Ubuntu and Windows and macOS installed a newer version that CMake would ignore to use. This PR installs Catch2 on Ubuntu 22.04 via the package manager and activates the test for Ubuntu on the CI. For Windows and macOS, Catch2 v3 has to be used and for this, the tests have to be upgraded.
Fixes #847.