python: Add test for python3 and fix found problems.

test3/test_sequnpack.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+
+
+from msgpack import Unpacker
+
+def test_foobar():
+    unpacker = Unpacker(read_size=3)
+    unpacker.feed(b'foobar')
+    assert unpacker.unpack() == ord(b'f')
+    assert unpacker.unpack() == ord(b'o')
+    assert unpacker.unpack() == ord(b'o')
+    assert unpacker.unpack() == ord(b'b')
+    assert unpacker.unpack() == ord(b'a')
+    assert unpacker.unpack() == ord(b'r')
+    try:
+        o = unpacker.unpack()
+        print(("Oops!", o))
+        assert 0
+    except StopIteration:
+        assert 1
+    else:
+        assert 0
+    unpacker.feed(b'foo')
+    unpacker.feed(b'bar')
+
+    k = 0
+    for o, e in zip(unpacker, b'foobarbaz'):
+        assert o == e
+        k += 1
+    assert k == len(b'foobar')
+
+if __name__ == '__main__':
+    test_foobar()
+