Add test for presence of copyrights and license terms
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84c837b..171fd29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -150,3 +150,7 @@
 
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/include/spirv-tools/libspirv.h
   DESTINATION include/spirv-tools/)
+
+add_test(NAME spirv-tools-copyrights
+         COMMAND ${PYTHON_EXECUTABLE} utils/check_copyright.py
+         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})