Add test for #1883: Unpickling Matcher

spacy/tests/regression/test_issue1883.py

@@ -0,0 +1,18 @@
+'''Check Matcher can be unpickled correctly.'''
+from __future__ import unicode_literals
+
+import copy
+
+from ... vocab import Vocab
+from ... matcher import Matcher
+from ... tokens import Doc
+
+
+def test_issue1883():
+    m = Matcher(Vocab())
+    m.add('pat1', None, [{'orth': 'hello'}])
+    doc = Doc(m.vocab, words=['hello'])
+    assert len(m(doc)) == 1
+    m2 = copy.deepcopy(m)
+    doc2 = Doc(m2.vocab, words=['hello'])
+    assert len(m2(doc2)) == 1