Add unit tests for mimir::Region

tests/CMakeLists.txt

@@ -0,0 +1,28 @@
+# ----====---- GoogleTest ----====---
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+# ----====---- End: GoogleTest ----====---
+
+enable_testing()
+
+add_executable(
+  mimir_test
+  "region_test.cpp"
+)
+target_link_libraries(
+  mimir_test
+  GTest::gtest_main
+  mimir
+)
+
+target_include_directories(mimir_test PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../include)
+
+include(GoogleTest)
+gtest_discover_tests(mimir_test)