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Hi,
Here is a patch to increase test coverage of test_glob.py. I added tests where the glob patterns are of type bytes. The coverage (according to coverage.py) is now complete, except for what are clearly artefacts probably caused by the fact that glob is loaded before coverage measurements start (global statements are reported not covered but local ones are).

I think it would be easier to subclass GlobTests and override norm and glob there (assuming that doesn't create problems with some of the tests).

Agreed, here is the patch where this is done.

Is test_bytes_glob_directory_with_trailing_slash unique to bytes, or should it be added to the base class instead?
What would be useful as bytes-only tests, I think, would be tests of non-ascii stuff.
Although that makes me wonder, do we test non-ascii unicode in the string tests? I presume that ought to be tested, too, though I suppose that could be tricky if the default encoding of the system the tests are running on can't handle the selected characters (such as, if it is ASCII).
Both of those are extras, though, the main question before committing this patch is the first one.

test_bytes_glob_directory_with_trailing_slash already has a counterpart in the main class, but it is not easily handled by overriding self.glob and self.norm. Since it is only a single test, I just decided to override test_glob_directory_with_trailing_slash from the main class. But looking at this now I realize that I actually created another method with a different name by mistake; so the attached patch changes that.

I've modified your patch slightly (cosmetic only).
When I run it on default I get the following:
/home/rdmurray/python/p33/Lib/os.py:263: BytesWarning: Comparison between bytes and string
 if tail == curdir: # xxx/newdir/. exists if xxx/newdir exists
/home/rdmurray/python/p33/Lib/glob.py:63: BytesWarning: Comparison between bytes and string
 if basename == '':
These presumably represent bugs. Care to investigate and file issues for them?

Im OK with the patch changes.
'''
/home/rdmurray/python/p33/Lib/os.py:263: BytesWarning: Comparison between bytes and string
 if tail == curdir: # xxx/newdir/. exists if xxx/newdir exists
/home/rdmurray/python/p33/Lib/glob.py:63: BytesWarning: Comparison between bytes and string
 if basename == '':
'''
Yes, I do see these warnings running with -b. I will look into them and try to fix them.

FTR this is addressed in #15845.

GlobTests.glob() tests that glob() for bytes returns the same (encoded) result as glob() for string. Therefore this patch is not needed, it doesn't increase test coverage.

OK, I'll close the issue then.
Alessandro, thanks anyway for the patch!