Fix the test target and unargumented ctest

CMake does know how to be tough on users, but we've won at last.

CMakeLists.txt

@@ -72,9 +72,11 @@ if (USE_SYSTEM_TERMO)
 		message (FATAL_ERROR "System termo library not found")
 	endif ()
 else ()
-	# We don't want the library to install, even though EXCLUDE_FROM_ALL
-	# sabotages CTest -- those unbuilt tests need to be excluded in CTest runs
+	# We don't want the library to install, but EXCLUDE_FROM_ALL ignores tests
 	add_subdirectory (termo EXCLUDE_FROM_ALL)
+	file (WRITE ${PROJECT_BINARY_DIR}/CTestCustom.cmake
+		"execute_process (COMMAND ${CMAKE_COMMAND} --build termo)")
+
 	# We don't have many good choices; this is a relatively clean approach
 	# (other possibilities: setting a variable in the parent scope, using
 	# a cache variable, writing a special config file with build paths in it
@@ -276,6 +278,19 @@ set (project_tests stardict)
 if (BUILD_TESTING)
 	enable_testing ()
 
+	find_program (xmlwf_EXECUTABLE xmlwf)
+	find_program (xmllint_EXECUTABLE xmllint)
+	foreach (xml sdgui.xml)
+		if (xmlwf_EXECUTABLE)
+			add_test (test-xmlwf-${xml} ${xmlwf_EXECUTABLE}
+				${PROJECT_SOURCE_DIR}/${xml})
+		endif ()
+		if (xmllint_EXECUTABLE)
+			add_test (test-xmllint-${xml} ${xmllint_EXECUTABLE} --noout
+				${PROJECT_SOURCE_DIR}/${xml})
+		endif ()
+	endforeach ()
+
 	foreach (name ${project_tests})
 		add_executable (test-${name}
 			src/test-${name}.c ${project_common_sources})