Add failing (on Py 2) test for passwd_check with unicode arguments

IPython/lib/tests/test_security.py

@@ -1,3 +1,4 b''
+# coding: utf-8
 from IPython.lib import passwd
 from IPython.lib.security import passwd_check, salt_len
 import nose.tools as nt
@@ -19,3 +20,7 b' def test_bad():'
     nt.assert_equal(passwd_check(p, 'a:b:c:d'), False)
     nt.assert_equal(passwd_check(p, 'a:b'), False)
 
+def test_passwd_check_unicode():
+    # GH issue #4524
+    phash = u'sha1:9dc18846ca26:6bb62badc41fde529c258a8a7fbe259a91313df8'
+    assert passwd_check(phash, u'mypassword³')
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