Working on travis file

.travis.yml

@@ -256,6 +256,11 @@ script:
     - if [ "${VALGRIND}" == "True" ]; then
         valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes --verbose --error-exitcode=1 test/tests;
       fi
+    - mkdir build_helloworld
+    - cd build_helloworld
+    - cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} ../helloworld/
+    - make -j2
+
 
 after_success: