FindEXPAT: Add unit test of target and variables

Tests/CMakeLists.txt

@@ -1427,6 +1427,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindDoxygen)
   endif()
 
+  if(CMake_TEST_FindEXPAT)
+    add_subdirectory(FindEXPAT)
+  endif()
+
   if(CMake_TEST_FindGSL)
     add_subdirectory(FindGSL)
   endif()

Tests/FindEXPAT/CMakeLists.txt

@@ -0,0 +1,10 @@
+add_test(NAME FindEXPAT.Test COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/FindEXPAT/Test"
+  "${CMake_BINARY_DIR}/Tests/FindEXPAT/Test"
+  ${build_generator_args}
+  --build-project TestFindEXPAT
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )

Tests/FindEXPAT/Test/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.9)
+project(TestFindEXPAT C)
+include(CTest)
+
+find_package(EXPAT REQUIRED)
+
+add_definitions(-DCMAKE_EXPECTED_EXPAT_VERSION="${EXPAT_VERSION_STRING}")
+
+add_executable(testexpat_tgt main.c)
+target_link_libraries(testexpat_tgt EXPAT::EXPAT)
+add_test(NAME testexpat_tgt COMMAND testexpat_tgt)
+
+add_executable(testexpat_var main.c)
+target_include_directories(testexpat_var PRIVATE ${EXPAT_INCLUDE_DIRS})
+target_link_libraries(testexpat_var PRIVATE ${EXPAT_LIBRARIES})
+add_test(NAME testexpat_var COMMAND testexpat_var)

Tests/FindEXPAT/Test/main.c

@@ -0,0 +1,21 @@
+#include <expat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main()
+{
+  XML_Expat_Version expat_version;
+  char expat_version_string[16];
+
+  expat_version = XML_ExpatVersionInfo();
+
+  snprintf(expat_version_string, 16, "%i.%i.%i", expat_version.major,
+           expat_version.minor, expat_version.micro);
+
+  if (strcmp(expat_version_string, CMAKE_EXPECTED_EXPAT_VERSION) != 0) {
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}