🚸 new test macro with customizable working directory (cda-tum#622)

## Description

This tiny PR adds a new macro for explicitly setting the working
directory for a googletest test suite. This can be useful for ensuring
that files on the system are properly found in the tests.

## Checklist:

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- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
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- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

Signed-off-by: burgholzer <burgholzer@me.com>

Author: burgholzer

cmake/PackageAddTest.cmake

@@ -14,3 +14,19 @@ macro(PACKAGE_ADD_TEST testname linklibs)
     set_target_properties(${testname} PROPERTIES FOLDER tests)
   endif()
 endmacro()
+
+macro(PACKAGE_ADD_TEST_WITH_WORKING_DIR testname linklibs test_working_directory)
+  if(NOT TARGET ${testname})
+    # create an executable in which the tests will be stored
+    add_executable(${testname} ${ARGN})
+    # link the Google test infrastructure and a default main function to the test executable.
+    target_link_libraries(${testname} PRIVATE ${linklibs} gmock gtest_main MQT::ProjectOptions
+                                              MQT::ProjectWarnings)
+    # discover tests
+    gtest_discover_tests(
+      ${testname}
+      WORKING_DIRECTORY ${test_working_directory}
+      PROPERTIES VS_DEBUGGER_WORKING_DIRECTORY "${test_working_directory}" DISCOVERY_TIMEOUT 60)
+    set_target_properties(${testname} PROPERTIES FOLDER tests)
+  endif()
+endmacro()