more unique filename for test

I actually had a filename named /tmp/foo and this test failed, because
it was owned by a different user, hence writing to it (and deleting it)
failed. Using /tmp/foo_iptest makes it a bit more unique, and a lot less
likely to be on a given system.

IPython/testing/plugin/dtexample.py

@@ -1,164 +1,164 b''
 """Simple example using doctests.
 
 This file just contains doctests both using plain python and IPython prompts.
 All tests should be loaded by nose.
 """
 from IPython.utils.py3compat import doctest_refactor_print
 
 def pyfunc():
     """Some pure python tests...
 
     >>> pyfunc()
     'pyfunc'
 
     >>> import os
 
     >>> 2+3
     5
 
     >>> for i in range(3):
     ...     print i,
     ...     print i+1,
     ...
     0 1 1 2 2 3
     """
     return 'pyfunc'
 
 @doctest_refactor_print
 def ipfunc():
     """Some ipython tests...
 
     In [1]: import os
 
     In [3]: 2+3
     Out[3]: 5
 
     In [26]: for i in range(3):
        ....:     print i,
        ....:     print i+1,
        ....:
     0 1 1 2 2 3
 
 
     Examples that access the operating system work:
 
     In [1]: !echo hello
     hello
 
-    In [2]: !echo hello > /tmp/foo
+    In [2]: !echo hello > /tmp/foo_iptest
 
-    In [3]: !cat /tmp/foo
+    In [3]: !cat /tmp/foo_iptest
     hello
 
-    In [4]: rm -f /tmp/foo
+    In [4]: rm -f /tmp/foo_iptest
 
     It's OK to use '_' for the last result, but do NOT try to use IPython's
     numbered history of _NN outputs, since those won't exist under the
     doctest environment:
 
     In [7]: 'hi'
     Out[7]: 'hi'
 
     In [8]: print repr(_)
     'hi'
     
     In [7]: 3+4
     Out[7]: 7
 
     In [8]: _+3
     Out[8]: 10
 
     In [9]: ipfunc()
     Out[9]: 'ipfunc'
     """
     return 'ipfunc'
 
 
 def ranfunc():
     """A function with some random output.
 
        Normal examples are verified as usual:
        >>> 1+3
        4
 
        But if you put '# random' in the output, it is ignored:
        >>> 1+3
        junk goes here...  # random
 
        >>> 1+2
        again,  anything goes #random
        if multiline, the random mark is only needed once.
 
        >>> 1+2
        You can also put the random marker at the end:
        # random
 
        >>> 1+2
        # random
        .. or at the beginning.
 
        More correct input is properly verified:
        >>> ranfunc()
        'ranfunc'
     """
     return 'ranfunc'
 
 
 def random_all():
     """A function where we ignore the output of ALL examples.
 
     Examples:
 
       # all-random
 
       This mark tells the testing machinery that all subsequent examples should
       be treated as random (ignoring their output).  They are still executed,
       so if a they raise an error, it will be detected as such, but their
       output is completely ignored.
 
       >>> 1+3
       junk goes here...
 
       >>> 1+3
       klasdfj;
 
       >>> 1+2
       again,  anything goes
       blah...
     """
     pass
 
 @doctest_refactor_print
 def iprand():
     """Some ipython tests with random output.
 
     In [7]: 3+4
     Out[7]: 7
 
     In [8]: print 'hello'
     world  # random
 
     In [9]: iprand()
     Out[9]: 'iprand'
     """
     return 'iprand'
 
 @doctest_refactor_print
 def iprand_all():
     """Some ipython tests with fully random output.
 
     # all-random
     
     In [7]: 1
     Out[7]: 99
 
     In [8]: print 'hello'
     world
 
     In [9]: iprand_all()
     Out[9]: 'junk'
     """
     return 'iprand_all'