Add regression test for #401

spacy/tests/regression/test_issue401.py

@@ -0,0 +1,14 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+import pytest
+
+
+@pytest.mark.xfail
+@pytest.mark.models
+@pytest.mark.parametrize('text,i', [("Jane's got a new car", 1),
+                                    ("Jane thinks that's a nice car", 3)])
+def test_issue401(EN, text, i):
+    """Text that 's in contractions is not lemmatized as '."""
+    tokens = EN(text)
+    assert tokens[i].lemma_ != "'"