Write a couple of tests, using monkey-patch of socket and selection. …

…See #13 and #17.

api/python/test_mcpi/test_minecraft.py

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+'''Tests for the legacy minecraft module.
+'''
+
+from mcpi.minecraft import Minecraft
+import mcpi.connection
+
+# We monkey-patch socket and select in connection.py.  This allows us
+# to 'listen to the wire' without the trouble of setting up a real
+# socket server.
+
+class DummySocket:
+    '''Dummy socket.socket class.
+    '''
+    def __init__(self, address, port):
+        self._sent = []
+
+    def connect(self, address_port):
+        pass
+
+    def sendall(self, s):
+        self._sent.append(s)
+
+
+class DummySocketModule:
+    '''Dummy socket module.
+    '''
+    AF_INET = SOCK_STREAM = None
+    socket = DummySocket
+
+
+class DummySelectModule:
+    '''Dummy select module.
+    '''
+    def select(self, *args):
+        return False, None, None
+
+
+# Do the monkey patch.  Affects only connection.py.
+mcpi.connection.socket = DummySocketModule()
+mcpi.connection.select = DummySelectModule()
+
+# Create the 'test fixture'.
+mc = Minecraft.create()
+sent = mc.conn.socket._sent
+
+
+def test_postToChat():
+
+    # This succeeds.  Good.
+    mc.postToChat('hi')
+    assert sent[-1] == 'chat.post(hi)\n'
+
+    # This should fail but does not.  Bad.
+    mc.postToChat('lookout)\ngotcha(')
+    assert sent[-1] == 'chat.post(lookout)\ngotcha()\n'
+
+
+def test_setPos():
+
+    # Here we get what we expect.
+    mc.player.setPos(3, 4, 5, 6)
+    assert sent[-1] == 'player.setPos(3,4,5,6)\n'