CMake: Add test for usage with find_package.

CMakeLists.txt

@@ -242,4 +242,6 @@ if(ZLIB_BUILD_TESTING)
         target_compile_definitions(minigzip64 PRIVATE LARGEFILE64_SOURCE=1)
         target_link_libraries(minigzip64 ZLIB::ZLIB)
     endif(HAVE_OFF64_T)
+
+    add_subdirectory(test)
 endif(ZLIB_BUILD_TESTING)

test/CMakeLists.txt

@@ -0,0 +1,44 @@
+add_test(NAME zlib_test_install
+    COMMAND ${CMAKE_COMMAND} --install ${zlib_BINARY_DIR}
+        --prefix ${CMAKE_CURRENT_BINARY_DIR}/test_install
+        --config $<CONFIG>
+    WORKING_DIRECTORY ${zlib_BINARY_DIR})
+
+file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/findpackage_test)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/find_package_test.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/findpackage_test/CMakeLists.txt)
+
+add_test(NAME zlib_test_configure_find_package
+   COMMAND ${CMAKE_COMMAND}
+       -B${CMAKE_CURRENT_BINARY_DIR}/findpackage_test_build
+       -DCMAKE_BUILD_TYPE=$<CONFIG>
+       -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}/test_install
+       -DZDIR=${CMAKE_CURRENT_BINARY_DIR}/test_install/${CMAKE_INSTALL_LIBDIR}
+       --fresh
+       -G "${CMAKE_GENERATOR}"
+       -S${CMAKE_CURRENT_BINARY_DIR}/findpackage_test)
+
+
+add_test(NAME zlib_test_build_find_package
+    COMMAND ${CMAKE_COMMAND} --build
+            ${CMAKE_CURRENT_BINARY_DIR}/findpackage_test_build
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/findpackage_test_build)
+
+add_test(NAME zlib_test_test_find_package
+    COMMAND ${CMAKE_CTEST_COMMAND} -C $<CONFIG>
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/findpackage_test_build)
+
+set_tests_properties(zlib_test_install PROPERTIES
+    FIXTURES_SETUP install)
+
+set_tests_properties(zlib_test_configure_find_package PROPERTIES
+    FIXTURES_REQUIRED install
+    FIXTURES_SETUP config)
+
+set_tests_properties(zlib_test_build_find_package PROPERTIES
+    FIXTURES_REQUIRED config
+    FIXTURES_SETUP build)
+
+set_tests_properties(zlib_test_test_find_package PROPERTIES
+    FIXTURES_REQUIRED build)

test/find_package_test.cmake.in

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.5)
+
+project(zlib_find_package_test
+    LANGUAGES C
+    VERSION 1.3.1.1)
+
+enable_testing()
+find_package(zlib CONFIG REQUIRED)
+
+if(${ZLIB_BUILD_SHARED})
+    add_executable(test_example ${zlib_SOURCE_DIR}/test/example.c)
+    target_link_libraries(test_example ZLIB::ZLIB)
+
+    if(NOT ${CMAKE_SHARED_LIBRARY_SUFFIX} STREQUAL ".dll")
+        add_test(NAME zlib_test_example_shared COMMAND test_example)
+    endif(NOT ${CMAKE_SHARED_LIBRARY_SUFFIX} STREQUAL ".dll")
+endif(${ZLIB_BUILD_SHARED})
+
+if(${ZLIB_BUILD_STATIC})
+    add_executable(test_example_static ${zlib_SOURCE_DIR}/test/example.c)
+    target_link_libraries(test_example_static ZLIB::ZLIBSTATIC)
+    add_test(NAME zlib_test_example_static
+        COMMAND test_example_static)
+endif(${ZLIB_BUILD_STATIC})