diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c2e2be7..d21c835 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -6,22 +6,13 @@
 # SPDX-License-Identifier: Apache-2.0
 # ~~~
 
-# Test add_subdirectory suppport for headers
-add_test(NAME integration.add_subdirectory_headers
+# Test add_subdirectory suppport
+add_test(NAME integration.add_subdirectory
     COMMAND ${CMAKE_CTEST_COMMAND}
         --build-and-test ${CMAKE_CURRENT_LIST_DIR}/integration
-                         ${CMAKE_CURRENT_BINARY_DIR}/add_subdirectory_headers
+                         ${CMAKE_CURRENT_BINARY_DIR}/add_subdirectory
         --build-generator ${CMAKE_GENERATOR}
-        --build-options -DFIND_PACKAGE_TESTING=OFF -DVULKAN_HEADERS_ENABLE_MODULE=OFF
-)
-
-# Test add_subdirectory suppport for C++20 modules
-add_test(NAME integration.add_subdirectory_modules
-    COMMAND ${CMAKE_CTEST_COMMAND}
-        --build-and-test ${CMAKE_CURRENT_LIST_DIR}/integration
-                         ${CMAKE_CURRENT_BINARY_DIR}/add_subdirectory_modules
-        --build-generator ${CMAKE_GENERATOR}
-        --build-options -DFIND_PACKAGE_TESTING=OFF -DVULKAN_HEADERS_ENABLE_MODULE=ON
+        --build-options -DFIND_PACKAGE_TESTING=OFF -DVULKAN_HEADERS_ENABLE_MODULE=${VULKAN_HEADERS_ENABLE_MODULE}
 )
 
 set(test_install_dir "${CMAKE_CURRENT_BINARY_DIR}/install")