mirtest is not packaged and only used for end to end tests.
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -10,7 +10,6 @@ include_directories(
 find_package(PkgConfig)
 pkg_check_modules(MIRAL miral REQUIRED)
 pkg_check_modules(MIRSERVER mirserver REQUIRED)
-pkg_check_modules(MIRTEST mirtest REQUIRED)
 pkg_check_modules(YAML REQUIRED IMPORTED_TARGET yaml-cpp)
 find_package(GTest REQUIRED)
 find_package(nlohmann_json 3.2.0 REQUIRED)