failing unit test for issue #3869

spacy/tests/regression/test_issue3869.py

@@ -0,0 +1,29 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+import pytest
+
+from spacy.attrs import IS_ALPHA
+from spacy.lang.en import English
+
+
+@pytest.mark.parametrize(
+    "sentence",
+    [
+        'The story was to the effect that a young American student recently called on Professor Christlieb with a letter of introduction.',
+        'The next month Barry Siddall joined Stoke City on a free transfer, after Chris Pearce had established himself as the Vale\'s #1.'
+    ],
+)
+def test_issue3869(sentence):
+    """Test that the Doc's count_by function works consistently"""
+    nlp = English()
+
+    doc = nlp(sentence)
+
+    count = 0
+    for token in doc:
+        count += token.is_alpha
+
+    assert count == doc.count_by(IS_ALPHA).get(1, 0)
+
+