Add a serialization test

MANIFEST.in

@@ -4,6 +4,7 @@ include requirements.txt
 include tox.ini
 include start.py
 recursive-include tests *.py
+recursive-include tests *.bin
 recursive-include minecraft *.py
 recursive-include docs *.rst
 include docs/Makefile

minecraft/networking/types.py

@@ -104,7 +104,7 @@ class VarInt(Type):
 
     @staticmethod
     def send(value, socket):
-        out = ""
+        out = bytes()
         while True:
             byte = value & 0x7F
             value >>= 7

tests/test_serialization.py

@@ -0,0 +1,42 @@
+import unittest
+from minecraft.networking.types import (
+    Type, Boolean, UnsignedByte, Byte, Short, UnsignedShort,
+    Integer, VarInt, Long, Float, Double, ShortPrefixedByteArray,
+    VarIntPrefixedByteArray, String
+)
+from minecraft.networking.packets import PacketBuffer
+
+TEST_DATA = {
+    Boolean: [True, False],
+    UnsignedByte: [0, 125],
+    Byte: [-22, 22],
+    Short: [-340, 22, 350],
+    UnsignedShort: [0, 400],
+    Integer: [-1000, 1000],
+    VarInt: [1, 250, 50000, 10000000],
+    Long: [50000000],
+    Float: [21.000301],
+    Double: [36.004002],
+    ShortPrefixedByteArray: [bytes(245)],
+    VarIntPrefixedByteArray: [bytes(1234)],
+    String: ["hello world"]
+}
+
+
+class SerializationTest(unittest.TestCase):
+
+    def test_serialization(self):
+        for data_type in Type.__subclasses__():
+            if data_type in TEST_DATA:
+                test_cases = TEST_DATA[data_type]
+
+                for test_data in test_cases:
+                    packet_buffer = PacketBuffer()
+                    data_type.send(test_data, packet_buffer)
+                    packet_buffer.reset_cursor()
+
+                    deserialized = data_type.read(packet_buffer)
+                    if data_type is Float or data_type is Double:
+                        self.assertAlmostEquals(test_data, deserialized, 3)
+                    else:
+                        self.assertEqual(test_data, deserialized)