Test #570: Initial test case, but not working yet

tests/resources/preserve_module_path/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.24)
+project(MyApp CXX)
+
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/modules)
+
+find_program(CCACHE ccache)
+find_package(OpenSSL)
+find_package(ZLIB)
+find_package(prometheus-cpp)
+
+include(CustomModule)
+hello_world()
+
+add_executable(app main.cpp)
+target_link_libraries(app hello::hello bye::bye)

tests/resources/preserve_module_path/modules/CustomModule.cmake

@@ -0,0 +1,6 @@
+
+message(STATUS "Loaded custom module")
+
+macro(hello_world)
+    message(WARNING "We should be seeing this warning, if we do the test works")
+endmacro()

tests/test_smoke.py

@@ -235,6 +235,20 @@ def test_msvc_runtime_singleconfig(self, capfd, config, msvc_runtime):
         expected_runtime_outputs = [f.format(expected_runtime=runtime) for f in expected_app_msvc_runtime]
         assert all(expected in out for expected in expected_runtime_outputs)
 
+class TestPreserveModulePath:
+    @pytest.fixture(scope="class", autouse=True)
+    def preserve_module_path_setup(self):
+        src_dir = Path(__file__).parent.parent
+        shutil.copytree(src_dir / 'tests' / 'resources' / 'preserve_module_path', ".", dirs_exist_ok=True)
+        yield
+
+    def test_preserve_module_path(self, capfd, chdir_build):
+        "Ensure that existing CMAKE_MODULE_PATH values remain in place after find_package(XXX) call"
+        run("cmake .. -DCMAKE_PROJECT_TOP_LEVEL_INCLUDES=conan_provider.cmake -DCMAKE_BUILD_TYPE=Release Module -DCMAKE_C_COMPILER=/usr/bin/cc", check=False)
+        out, _ = capfd.readouterr()
+        assert "We should be seeing this warning, if we do the test works" in out
+        run("cmake --build .")
+
 
 class TestFindModules:
     def test_find_module(self, capfd, basic_cmake_project):