Tests/FindPostgreSQL: add a test for FindPostgreSQL

Tests/CMakeLists.txt

@@ -1461,6 +1461,10 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
     add_subdirectory(FindPatch)
   endif()
 
+  if(CMake_TEST_FindPostgreSQL)
+    add_subdirectory(FindPostgreSQL)
+  endif()
+
   if(CMake_TEST_FindProtobuf)
     add_subdirectory(FindProtobuf)
   endif()

Tests/FindPostgreSQL/CMakeLists.txt

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

Tests/FindPostgreSQL/Test/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.10)
+project(TestFindPostgreSQL C)
+include(CTest)
+
+find_package(PostgreSQL REQUIRED)
+
+add_definitions(-DCMAKE_EXPECTED_POSTGRESQL_VERSION="${PostgreSQL_VERSION_STRING}")
+
+add_executable(test_tgt main.c)
+target_link_libraries(test_tgt PostgreSQL::PostgreSQL)
+add_test(NAME test_tgt COMMAND test_tgt)
+
+add_executable(test_var main.c)
+target_include_directories(test_var PRIVATE ${PostgreSQL_INCLUDE_DIRS})
+target_link_libraries(test_var PRIVATE ${PostgreSQL_LIBRARIES})
+add_test(NAME test_var COMMAND test_var)

Tests/FindPostgreSQL/Test/main.c

@@ -0,0 +1,15 @@
+#include <libpq-fe.h>
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+  int version = PQlibVersion();
+  int major = version / 10000;
+  int minor = version % 10000;
+  char version_string[100];
+  snprintf(version_string, sizeof(version_string), "%d.%d", major, minor);
+  printf("Found PostgreSQL version %s, expected version %s\n", version_string,
+         CMAKE_EXPECTED_POSTGRESQL_VERSION);
+  return strcmp(version_string, CMAKE_EXPECTED_POSTGRESQL_VERSION);
+}