From 68ee0384fd4fb771f5ac32391b61d9442130d53d Mon Sep 17 00:00:00 2001
From: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
Date: Tue, 20 Aug 2019 16:40:25 +0200
Subject: [PATCH] Unit test for Issue 3879 (#4153)

* failing unit test for Issue #3879

* mark test as failing
---
 spacy/tests/regression/test_issue3879.py | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 spacy/tests/regression/test_issue3879.py

diff --git a/spacy/tests/regression/test_issue3879.py b/spacy/tests/regression/test_issue3879.py
new file mode 100644
index 000000000..0eed8bb81
--- /dev/null
+++ b/spacy/tests/regression/test_issue3879.py
@@ -0,0 +1,21 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+import pytest
+from spacy.lang.en import English
+from spacy.matcher import Matcher
+
+
+@pytest.mark.xfail
+def test_issue3879(en_vocab):
+    nlp = English()
+    text = "This is a test."
+    doc = nlp(text)
+    assert len(doc) == 5
+
+    pattern = [{"ORTH": "This", "OP": "?"}, {"OP": "?"}, {"ORTH": "test"}]
+    matcher = Matcher(nlp.vocab)
+    matcher.add("rule", None, pattern)
+    matches = matcher(doc)
+
+    assert len(matches) == 2  # fails because of a FP match 'is a test'