Add tests

[urbandove]

Added a few tests

[coveralls]

Coverage decreased (-0.3%) to 92.835% when pulling 65e6302 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.3%) to 92.835% when pulling 65e6302 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.3%) to 92.835% when pulling 65e6302 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.2%) to 92.938% when pulling de59d26 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.2%) to 92.938% when pulling de59d26 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.1%) to 93.04% when pulling 29935c2 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage decreased (-0.1%) to 93.04% when pulling 29935c2 on urbandove:tests into 24706f5 on graphql-python:master.

[coveralls]

Coverage increased (+0.6%) to 93.756% when pulling 51f794e on urbandove:tests into 24706f5 on graphql-python:master.

[spockNinja]

@urbandove Thanks for the test additions! We're waiting on another test fix to get the build passing again. Once that is merged, we can re-run this through Travis.

[spockNinja]

@urbandove
Tests are all passing. Coverage is up a bit. Thanks for the contribution!

@syrusakbary
Here are some test additions with one minor fix found in the test_should_error_if_last_is_greater_than_max test that appears to remedy some copy-pasta. It's ready for your stamp of approval.

[patrick91]

@graphql-python/django can we merge this? :)