Use context manager for assertRaises

[pferate]

Using context manager for assertRaises calls. Also needed to update files using unittest to unittest2 to be able to use context managers in Python 2.6 (was added to unittest in 2.7). Keeping the same import and usage syntax as the other files using unittest2.

[theacodes]

@pferate this is almost ready, only one outstanding comment (about the if __name__ stuff)

[pferate]

@jonparrott Is there something I missed? I took care of the if __name__ stuff in 06e7032.

I only left those checks in the /scripts/* files.

Edit: nevermind, I see that the one you referenced was the one in the /scripts/ directory.

[theacodes]

Oh, I see, my apologies.

@nathanielmanistaatgoogle I'm merging this tests-only change. Let me know if you have any post-merge concerns.

@pferate thanks for doing this! Much appreciated!

[pferate]

No problem @jonparrott!