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Lib/test/test_tools.py becomes too large. It includes tests of unrelated command-lines tools and scripts. It would be good to convert it to directory containing separate test files for different tools.

How about this?

Here's the same patch in --git format, which should make the actual changes clearer (though probably not in Rietveld).

Here's a new version of the patch in response to review comments. Patch is in --git format, which means no Rietveld link for this one.
Changes from the first patch:
- Remove Tools/parser/test_unparse.py entirely (moved to Lib/test/test_tools/)
- Remove tearDownClass from the pdeps test
- Fix (remove) test_main from test_unparse
- Add test_md5sum (new since first patch)

About load_tests() -- look at Lib/test/test_email/__init__.py.
Otherwise LGTM.

New changeset e69f037332a6 by Zachary Ware in branch '3.4':
Issue #21918: Convert test_tools.py to a sub-package of test.
http://hg.python.org/cpython/rev/e69f037332a6
New changeset 1d0ca204c36f by Zachary Ware in branch 'default':
Issue #21918: Convert test_tools.py to a sub-package of test.
http://hg.python.org/cpython/rev/1d0ca204c36f 

Committed, thanks for the reviews!
I had modeled load_tests after test_json's load_tests. The idiom used in test_email causes a warning from regrtest about sys.path being modified, so I modified the idiom slightly and used that. I have declined to backport the patch to 2.7; it's more trouble than it's worth to me.

Thanks for your patch. Do you want to correct test_json's and others 
load_tests?

Sure, I'll work on that some time this week.