Revert "Add regression test for #859"

This reverts commit c4f16c66d1.

spacy/tests/regression/test_issue859.py

@@ -1,13 +0,0 @@
-# encoding: utf8
-from __future__ import unicode_literals
-
-import pytest
-
-
-@pytest.mark.xfail
-@pytest.mark.parametrize('text', ["aaabbb@ccc.com\nThank you!"])
-def test_issue859(en_tokenizer, text):
-    """Test that no extra space is added in doc.text method."""
-    doc = en_tokenizer(text)
-    assert ' ' not in doc.text
-    assert doc.text == text