Tell CMake to look in individual test directories for tests if they exist

CMakeLists.txt

@@ -92,8 +92,22 @@ ENDIF(TREAT_WARNINGS_AS_ERRORS)
 SET(CMAKE_MODULE_PATH "${FasTC_SOURCE_DIR}/CMakeModules" ${CMAKE_MODULE_PATH})
 FIND_PACKAGE(PVRTexLib)
 
-ADD_SUBDIRECTORY(BPTCEncoder)
-ADD_SUBDIRECTORY(IO)
-ADD_SUBDIRECTORY(Core)
+SET(FASTC_DIRECTORIES
+  BPTCEncoder IO Core
+)
+
+FOREACH(DIR ${FASTC_DIRECTORIES})
+  ADD_SUBDIRECTORY(${DIR})
+ENDFOREACH()
+
+ENABLE_TESTING()
+
+ADD_SUBDIRECTORY(GTest)
+FOREACH(DIR ${FASTC_DIRECTORIES})
+  SET(TESTDIR ${FasTC_SOURCE_DIR}/${DIR}/test)
+  IF(IS_DIRECTORY ${TESTDIR})
+    ADD_SUBDIRECTORY(${TESTDIR})
+  ENDIF()
+ENDFOREACH()
 
 ADD_SUBDIRECTORY(CLTool)