Travis: Test node does not exist or is not executable

edit

when i try to

rostest tests integration.launch

locally i got no errors. while on travis i got this

FAILURE: Test node [tests/test_integration.py] does not exist or is not executable

i check the permisions of the file i got this

-rwxrwxrwx 1 mohamed mohamed 442 نوف 15 19:45 test_integration.py

the structure of the repo is as follow my repo

the travis build
my system: ubuntu: 16.04 Ros: kinetic
any help will be apperciated