Integrating coveralls with travis in a python project

This post is about setting up coveralls and travis in a Python project.

Greb is a dictionary cli, written in Python which uses Travis to check whether the test cases are running fine or not. Travis as the wiki says is a continuous integration service which is used to build and test software projects hosted on Github.

Config for travis lives in a file called .travis.yml which should be present at the root directory of the project. When any commit is pushed or a pull request is created, a webhook is triggered, which initiates the travis and it then checks the build process.

Initially, greb had only a travis integration, which looked something like

language: python
python:
    - "3.4"
    - "3.3"
    - "2.7"
install:
    - "pip install ."
    - "pip install flake8"
    - "pip install ."
script:
    - "python -m test.test_greb"
    - "flake8 greb"
    - "flake8 test"

The file is self-explanatory, except the script part. Here I am using unit testing hence the line python -m test.test_greb

Now I wanted to integrate coveralls.io in greb. The integration is very simple. Here are the steps

• Set environment variable COVERALLS_REPO_TOKEN in settings on Travis for the project. The value for this variable can be found from Coveralls website at the bottom right corner.

• Update your .travis.yml per section as follows:

  • Add pip install coveralls in install section
  • Update python -m test.test_greb to coverage run --source=greb -m test.test_greb in script
  • Add a new section namely after_script and add coveralls in it.

  coverage run can be considered as python executable, hence passing -m test.test_greb. It generates a .coverage file which gets pushed to coveralls.io, where it is presented in a nicely formatted way.

The updated .travis.yml will look something like

language: python
python:
    - "3.4"
    - "3.3"
    - "2.7"
install:
    - "pip install ."
    - "pip install flake8"
    - "pip install coveralls"
script:
    - "flake8 greb"
    - "flake8 test"
    - "coverage run --source=greb -m test.test_greb"
after_script:
    - coveralls

References

• http://www.tivix.com/blog/how-to-test-open-source-django-app/

Taranjeet Singh

Full Stack Developer, Entrepreneur

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