* Add test_io

tests/serialize/test_io.py

@@ -0,0 +1,23 @@
+import pytest
+
+from spacy.serialize.packer import Packer
+from spacy.attrs import ORTH, SPACY
+from spacy.tokens import Doc
+import math
+
+
+def test_read_write(EN):
+    doc1 = EN(u'This is a simple test. With a couple of sentences.')
+    doc2 = EN(u'This is another test document.')
+
+    with open('/tmp/spacy_docs.bin', 'wb') as file_:
+        file_.write(doc1.to_bytes())
+        file_.write(doc2.to_bytes())
+
+    with open('/tmp/spacy_docs.bin', 'rb') as file_:
+        bytes1, bytes2 = Doc.read_bytes(file_)
+        r1 = Doc(EN.vocab).from_bytes(bytes1)
+        r2 = Doc(EN.vocab).from_bytes(bytes2)
+
+    assert r1.string == doc1.string
+    assert r2.string == doc2.string