[issue1706039] Added clearerr() to clear EOF state

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

The tests need to be cleaned up a little.  The setup code should go to setUp() method and instead of calling different methods in a loop with a switch over method names, it should just have a separate test_ method for each method tested.  A "with" statement can also reduce some boilerplate.

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nosy:  -BreamoreBoy

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<http://bugs.python.org/issue1706039>
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