4 files changed, 100 insertions, 96 deletions
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8af9447..93e8078 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -6,41 +6,32 @@
 # SPDX-License-Identifier: Apache-2.0
 # ~~~
 
-# Test the non-API headers provided by this repo
-# NOTE: For us testing just means that these header files compile
-# with reasonable warnings.
-
-message(STATUS "${PROJECT_NAME} = ${PROJECT_VERSION}")
-
-set(CMAKE_C_STANDARD 99)
-set(CMAKE_C_STANDARD_REQUIRED ON)
-set(CMAKE_C_EXTENSIONS OFF)
-
-if(${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
-    add_compile_options(
-        -Wpedantic
-        -Wall
-        -Wextra
-        -Werror
-    )
-endif()
-
-if (MSVC)
-    add_compile_options(
-        /W4
-        /permissive-
-        /WX
-    )
+if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24")
+    set(fresh "--fresh")
 endif()
 
-# vk_icd.h
-add_library(vk_icd MODULE vk_icd.c)
-target_link_libraries(vk_icd PRIVATE Vulkan::Headers)
-
-# vk_layer.h
-add_library(vk_layer MODULE vk_layer.c)
-target_link_libraries(vk_layer PRIVATE Vulkan::Headers)
-
-if (NOT TARGET Vulkan-Headers)
-    message(FATAL_ERROR "Backcompat for Vulkan-Headers target broken!")
-endif()
+# 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
+        --build-generator ${CMAKE_GENERATOR}
+        --build-options -DFIND_PACKAGE_TESTING=OFF "${fresh}"
+)
+
+set(test_install_dir "${CMAKE_CURRENT_BINARY_DIR}/install")
+add_test(NAME integration.install
+    COMMAND ${CMAKE_COMMAND} --install ${VULKAN_HEADERS_BINARY_DIR} --prefix ${test_install_dir}
+)
+
+# Test find_package suppport
+add_test(NAME integration.find_package
+    COMMAND ${CMAKE_CTEST_COMMAND}
+        --build-and-test ${CMAKE_CURRENT_LIST_DIR}/integration
+                         ${CMAKE_CURRENT_BINARY_DIR}/find_package
+        --build-generator ${CMAKE_GENERATOR}
+        --build-options -DFIND_PACKAGE_TESTING=ON -DCMAKE_PREFIX_PATH=${test_install_dir} "${fresh}"
+)
+
+# Installing comes before testing
+set_tests_properties(integration.find_package PROPERTIES DEPENDS integration.install)
diff --git a/tests/add_subdirectory/CMakeLists.txt b/tests/add_subdirectory/CMakeLists.txt
deleted file mode 100644
index 286c36e..0000000
--- a/tests/add_subdirectory/CMakeLists.txt
+++ /dev/null
@@ -1,30 +0,0 @@
-# ~~~
-# Copyright 2022-2023 The Khronos Group Inc.
-# Copyright 2022-2023 Valve Corporation
-# Copyright 2022-2023 LunarG, Inc.
-#
-# SPDX-License-Identifier: Apache-2.0
-# ~~~
-cmake_minimum_required(VERSION 3.14.2)
-
-project(TEST_VULKAN_HEADERS_ADD_SUBDIRECTORY_SUPPORT LANGUAGES C)
-
-add_subdirectory(../../ ${CMAKE_CURRENT_BINARY_DIR}/headers)
-
-if (NOT TARGET Vulkan::Headers)
-    message(FATAL_ERROR "Vulkan::Headers target not defined")
-endif()
-
-# Consuming vulkan-headers via add_subdirectory should NOT add installation code to the parent CMake project.
-if (DEFINED CMAKE_INSTALL_INCLUDEDIR)
-    message(FATAL_ERROR "CMAKE_INSTALL_INCLUDEDIR was defined!")
-endif()
-
-add_library(foobar STATIC)
-
-target_link_libraries(foobar PRIVATE Vulkan::Headers)
-
-target_sources(foobar PRIVATE
-    ../vk_icd.c
-    ../vk_layer.c
-)
diff --git a/tests/find_package/CMakeLists.txt b/tests/find_package/CMakeLists.txt
deleted file mode 100644
index c1a9900..0000000
--- a/tests/find_package/CMakeLists.txt
+++ /dev/null
@@ -1,30 +0,0 @@
-# ~~~
-# Copyright 2022-2023 The Khronos Group Inc.
-# Copyright 2022-2023 Valve Corporation
-# Copyright 2022-2023 LunarG, Inc.
-#
-# SPDX-License-Identifier: Apache-2.0
-# ~~~
-cmake_minimum_required(VERSION 3.14.2)
-
-project(TEST_VULKAN_HEADERS_FIND_PACKAGE_SUPPORT LANGUAGES C)
-
-find_package(VulkanHeaders REQUIRED CONFIG)
-
-if (NOT TARGET Vulkan::Headers)
-    message(FATAL_ERROR "Vulkan::Headers target not defined")
-endif()
-
-if (NOT DEFINED VulkanHeaders_VERSION)
-    message(FATAL_ERROR "VulkanHeaders_VERSION not defined!")
-endif()
-message(STATUS "VulkanHeaders_VERSION = ${VulkanHeaders_VERSION}")
-
-add_library(foobar STATIC)
-
-target_link_libraries(foobar PRIVATE Vulkan::Headers)
-
-target_sources(foobar PRIVATE
-    ../vk_icd.c
-    ../vk_layer.c
-)
diff --git a/tests/integration/CMakeLists.txt b/tests/integration/CMakeLists.txt
new file mode 100644
index 0000000..6a3388e
--- /dev/null
+++ b/tests/integration/CMakeLists.txt
@@ -0,0 +1,73 @@
+# ~~~
+# Copyright 2022-2023 The Khronos Group Inc.
+# Copyright 2022-2023 Valve Corporation
+# Copyright 2022-2023 LunarG, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+# ~~~
+cmake_minimum_required(VERSION 3.14.2)
+
+project(API LANGUAGES C)
+
+if (FIND_PACKAGE_TESTING)
+    find_package(VulkanHeaders REQUIRED CONFIG)
+else()
+    add_subdirectory(../../ ${CMAKE_CURRENT_BINARY_DIR}/headers)
+endif()
+
+if (NOT TARGET Vulkan::Headers)
+    message(FATAL_ERROR "Vulkan::Headers target not defined")
+endif()
+
+if (FIND_PACKAGE_TESTING)
+    if (NOT DEFINED VulkanHeaders_VERSION)
+        message(FATAL_ERROR "VulkanHeaders_VERSION not defined!")
+    endif()
+    message(STATUS "VulkanHeaders_VERSION = ${VulkanHeaders_VERSION}")
+endif()
+
+if (NOT FIND_PACKAGE_TESTING)
+    # Consuming vulkan-headers via add_subdirectory should NOT add installation code to the parent CMake project.
+    if (DEFINED CMAKE_INSTALL_INCLUDEDIR)
+        message(FATAL_ERROR "CMAKE_INSTALL_INCLUDEDIR was defined!")
+    endif()
+
+    # NOTE: Some users may not be using the namespace target.
+    # Don't accidentally break them unless we have to.
+    if (NOT TARGET Vulkan-Headers)
+        message(FATAL_ERROR "Backcompat for Vulkan-Headers target broken!")
+    endif()
+endif()
+
+set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_C_EXTENSIONS OFF)
+
+if(${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
+    add_compile_options(
+        -Wpedantic
+        -Wall
+        -Wextra
+        -Werror
+    )
+endif()
+
+if (MSVC)
+    add_compile_options(
+        /W4
+        /permissive-
+        /WX
+    )
+endif()
+
+# Test the non-API headers provided by this repo
+# NOTE: For us testing just means that these header files compile
+# with reasonable warnings.
+
+# vk_icd.h
+add_library(vk_icd MODULE ../vk_icd.c)
+target_link_libraries(vk_icd PRIVATE Vulkan::Headers)
+
+# vk_layer.h
+add_library(vk_layer MODULE ../vk_layer.c)
+target_link_libraries(vk_layer PRIVATE Vulkan::Headers)