Add test for unicode in logging.

IPython/core/tests/test_logger.py

@@ -1,6 +1,9 b''
 """Test IPython.core.logger"""
 
+import os.path
+
 import nose.tools as nt
+from IPython.utils.tempdir import TemporaryDirectory
 
 _ip = get_ipython()
 
@@ -17,3 +20,12 b' def test_logstart_inaccessible_file():'
     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()