[yt-svn] [yt_analysis/yt] Increase unit test coverage (issue #426)

[Matthew Turk]

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New issue 426: Increase unit test coverage
https://bitbucket.org/yt_analysis/yt/issue/426/increase-unit-test-coverage

Matthew Turk:

The unit testing coverage in yt is quite low at this time; while answer testing is relatively good, the number of isolated code units that are being tested is low.

This can be addressed by using Nose, and NumPy's plugins for Nose, to run numerous tests over some fundamental code pieces.  The structure for this will be:

{{{yt/something/}}}

will feature tests in the directory:

{{{yt/something/tests/}}}

This ticket will be closed when the following items have unit tests added to them:

 * kD-tree for nearest neighbor
 * Geometric selection routines
 * Profiles
 * Projections -- underlying quadtree
 * Data object selection of data containers
 * Data object selection of points
 * Orientation class
 * Pixelization
 * Color maps
 * PNG writing

Responsible: MatthewTurk
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