From 72b9bd57ec8b7cf6fb4045da32e99704b27d0ba1 Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Thu, 3 Nov 2016 00:09:35 +0100
Subject: [PATCH] Test Issue #588: Matcher accepts invalid, empty patterns.

---
 spacy/tests/regression/test_issue588.py | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 spacy/tests/regression/test_issue588.py

diff --git a/spacy/tests/regression/test_issue588.py b/spacy/tests/regression/test_issue588.py
new file mode 100644
index 000000000..0b7defe75
--- /dev/null
+++ b/spacy/tests/regression/test_issue588.py
@@ -0,0 +1,10 @@
+import pytest
+from ...vocab import Vocab
+from ...tokens import Doc
+from ...matcher import Matcher
+
+
+def test_issue588():
+    matcher = Matcher(Vocab())
+    with pytest.raises(ValueError):
+        matcher.add(entity_key='1', label='TEST', attrs={}, specs=[[]])