Add xfailing test for #3288

spacy/tests/regression/test_issue3288.py

@@ -0,0 +1,20 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+import pytest
+import numpy
+from spacy import displacy
+
+from ..util import get_doc
+
+
+@pytest.mark.xfail
+def test_issue3288(en_vocab):
+    """Test that retokenization works correctly via displaCy when punctuation
+    is merged onto the preceeding token and tensor is resized."""
+    words = ["Hello", "World", "!", "When", "is", "this", "breaking", "?"]
+    heads = [1, 0, -1, 1, 0, 1, -2, -3]
+    deps = ["intj", "ROOT", "punct", "advmod", "ROOT", "det", "nsubj", "punct"]
+    doc = get_doc(en_vocab, words=words, heads=heads, deps=deps)
+    doc.tensor = numpy.zeros(96, dtype="float32")
+    displacy.render(doc)