Fix irunner tests when $PYTHONSTARTUP is set.

Closes gh-2655

IPython/lib/tests/test_irunner.py

@@ -1,180 +1,180
 """Test suite for the irunner module.
 
 Not the most elegant or fine-grained, but it does cover at least the bulk
 functionality."""
 from __future__ import print_function
 
 # Global to make tests extra verbose and help debugging
 VERBOSE = True
 
 # stdlib imports
 import StringIO
 import sys
 import unittest
 
 # IPython imports
 from IPython.lib import irunner
 from IPython.utils.py3compat import doctest_refactor_print
 
 # Testing code begins
 class RunnerTestCase(unittest.TestCase):
 
     def setUp(self):
         self.out = StringIO.StringIO()
         #self.out = sys.stdout
 
     def _test_runner(self,runner,source,output):
         """Test that a given runner's input/output match."""
         
         runner.run_source(source)
         out = self.out.getvalue()
         #out = ''
         # this output contains nasty \r\n lineends, and the initial ipython
         # banner.  clean it up for comparison, removing lines of whitespace
         output_l = [l for l in output.splitlines() if l and not l.isspace()]
         out_l = [l for l in out.splitlines() if l and not l.isspace()]
         mismatch  = 0
         if len(output_l) != len(out_l):
             message = ("Mismatch in number of lines\n\n"
                        "Expected:\n"
                        "~~~~~~~~~\n"
                        "%s\n\n"
                        "Got:\n"
                        "~~~~~~~~~\n"
                        "%s"
                        ) % ("\n".join(output_l), "\n".join(out_l))
             self.fail(message)
         for n in range(len(output_l)):
             # Do a line-by-line comparison
             ol1 = output_l[n].strip()
             ol2 = out_l[n].strip()
             if ol1 != ol2:
                 mismatch += 1
                 if VERBOSE:
                     print('<<< line %s does not match:' % n)
                     print(repr(ol1))
                     print(repr(ol2))
                     print('>>>')
         self.assertTrue(mismatch==0,'Number of mismatched lines: %s' %
                         mismatch)
 
     def testIPython(self):
         """Test the IPython runner."""
         source = doctest_refactor_print("""
 print 'hello, this is python'
 # some more code
 x=1;y=2
 x+y**2
 
 # An example of autocall functionality
 from math import *
 autocall 1
 cos pi
 autocall 0
 cos pi
 cos(pi)
 
 for i in range(5):
     print i
 
 print "that's all folks!"
 
 exit
 """)
         output = doctest_refactor_print("""\
 In [1]: print 'hello, this is python'
 hello, this is python
 
 
 # some more code
 In [2]: x=1;y=2
 
 In [3]: x+y**2
 Out[3]: 5
 
 
 # An example of autocall functionality
 In [4]: from math import *
 
 In [5]: autocall 1
 Automatic calling is: Smart
 
 In [6]: cos pi
 ------> cos(pi)
 Out[6]: -1.0
 
 In [7]: autocall 0
 Automatic calling is: OFF
 
 In [8]: cos pi
    File "<ipython-input-8-6bd7313dd9a9>", line 1
      cos pi
           ^
 SyntaxError: invalid syntax
 
 
 In [9]: cos(pi)
 Out[9]: -1.0
 
 
 In [10]: for i in range(5):
    ....:     print i
    ....:
 0
 1
 2
 3
 4
 
 In [11]: print "that's all folks!"
 that's all folks!
 
 
 In [12]: exit
 """)
         runner = irunner.IPythonRunner(out=self.out)
         self._test_runner(runner,source,output)
 
     def testPython(self):
         """Test the Python runner."""
-        runner = irunner.PythonRunner(out=self.out)
+        runner = irunner.PythonRunner(out=self.out, args=['-E'])
         source = doctest_refactor_print("""
 print 'hello, this is python'
 
 # some more code
 x=1;y=2
 x+y**2
 
 from math import *
 cos(pi)
 
 for i in range(5):
     print i
 
 print "that's all folks!"
         """)
         output = doctest_refactor_print("""\
 >>> print 'hello, this is python'
 hello, this is python
 
 # some more code
 >>> x=1;y=2
 >>> x+y**2
 5
 
 >>> from math import *
 >>> cos(pi)
 -1.0
 
 >>> for i in range(5):
 ...     print i
 ...
 0
 1
 2
 3
 4
 >>> print "that's all folks!"
 that's all folks!
 """)
         self._test_runner(runner,source,output)