language: python
python:
  - "2.6"
  - "2.7"
  - "3.3"
  - "3.4"
install:
  - pip install tox
script:
  - tox -e $(echo py$TRAVIS_PYTHON_VERSION | tr -d . | sed -e 's/pypypy/pypy/')

language: python
python:
  - "2.6"
  - "2.7"
  - "3.3"
  - "3.4"
  - "pypy"
  - "pypy3"
install:
  - pip install tox
script:
  - tox -e $(echo py$TRAVIS_PYTHON_VERSION | tr -d . | sed -e 's/pypypy/pypy/')

Test with pypy and pypy3
Test with pypy and pypy3

To check if it actually works