Add regression test

spacy/tests/regression/test_issue852.py

@@ -0,0 +1,12 @@
+# encoding: utf8
+from __future__ import unicode_literals
+
+import pytest
+
+
+@pytest.mark.parametrize('text', ["au-delàs", "pair-programmâmes",
+                                  "terra-formées", "σ-compacts"])
+def test_issue852(fr_tokenizer, text):
+    """Test that French tokenizer exceptions are imported correctly."""
+    tokens = fr_tokenizer(text)
+    assert len(tokens) == 1