How to add files to Travis CI?

Question

Python

writing web tests, using component approach selenium-python.readthedocs.org/page-objects.html , running tests in Travis CI, giving error - "ERROR: Failure: ImportError (No module named 'page')". Here is the yml file:
language: python
python:
- "3.5"
install:
- pip install --upgrade pip
- pip install selenium
# command to run tests script
: nosetests TestCases.py
but only a file with tests, a file with a calculator, he clings to it, but here he does not see page.py. What to do with it? In yml prescribe all files? And if you prescribe, then how?