Add missing encoding declaration to file with unicode in it.

IPython/core/tests/test_logger.py

@@ -1,31 +1,32 b''
+# -*- coding: utf-8 -*-
 """Test IPython.core.logger"""
 
 import os.path
 
 import nose.tools as nt
 from IPython.utils.tempdir import TemporaryDirectory
 
 _ip = get_ipython()
 
 def test_logstart_inaccessible_file():
     try:
         _ip.logger.logstart(logfname="/")   # Opening that filename will fail.
     except IOError:
         pass
     else:
         nt.assert_true(False)           # The try block should never pass.
     
     try:
         _ip.run_cell("a=1")                 # Check it doesn't try to log this
     finally:
         _ip.logger.log_active = False  # If this fails, don't let later tests fail
 
 def test_logstart_unicode():
     with TemporaryDirectory() as tdir:
         logfname = os.path.join(tdir, "test_unicode.log")
         _ip.run_cell("'abc€'")
         try:
             _ip.magic("logstart -to %s" % logfname)
             _ip.run_cell("'abc€'")
         finally:
             _ip.logger.logstop()