[issue1812] doctest _load_testfile function -- newline handling seems incorrect

[Peter Donis]

Peter Donis added the comment:

I've uploaded a revised diff with two small improvements:

(1) Removed a redundant os.isfile check in 
PackageLoaderTestImporter.get_data() in doctest_testfile.py. (The 
open() builtin already raises IOError if the file can't be opened.)

(2) Added doctest.master = None in three places in doctest_testfile.py 
so the expected output is now nothing instead of three lines of

*** DocTestRunner.merge: 'doctest_testfile.txt' in both testers; 
summing outcomes.

Changed the expected output in test_doctest.py to correspond.

Added file: http://bugs.python.org/file9142/doctest-fixes1.diff

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