Write tests for OAuth1 Client class

[idan]

No description provided.

[ib-lundgren]

There are many things that would be useful to add as tests. On top of my head ...

• Tests serve as great documentation, show off the different signature methods with tests, i.e. rsa and plaintext.
• Requests with application/x-www-form-urlencoded, ensure it affects the signature
• Requests with non application/x-www-form-urlencoded, ensure it does not affect the signature. For examples see http://en.wikipedia.org/wiki/MIME_type
• Possible run over a set of sample "real" requests with more complex combinations of query params, headers and body than the usual basic test.
• Similar to the above would be to generate possible combinations of combinations with nonsensical but valid data and see if there are odd edge cases.