Python library/code for testing pseudorandom number generators (PRNGs)?

For one of my subjects, I am required to create a pseudorandom number generator (PRNG) and test it using python code. At the moment, there is not a specific test required. Any tests will do if they test the stochasticity (randomness) of the output stream from the pseudorandom number generator. Does anyone have any suggestions for libraries/code/testsuites in python? I would prefer if there was a library that I add to my existing code. Thank you for your time.