diff --git a/irctest/client_mock.py b/irctest/client_mock.py
index e781929..da82379 100644
--- a/irctest/client_mock.py
+++ b/irctest/client_mock.py
@@ -30,7 +30,7 @@ class ClientMock:
             self.sendLine('PING {}'.format(token))
         got_pong = False
         data = b''
-        messages = []
+        (self.inbuffer, messages) = ([], self.inbuffer)
         conn = self.conn
         while not got_pong:
             try:
diff --git a/irctest/specifications.py b/irctest/specifications.py
new file mode 100644
index 0000000..01c9f39
--- /dev/null
+++ b/irctest/specifications.py
@@ -0,0 +1,16 @@
+import enum
+
+@enum.unique
+class Specifications(enum.Enum):
+    RFC1459 = 'RFC1459'
+    RFC2812 = 'RFC2812'
+    IRC301 = 'IRCv3.1'
+    IRC302 = 'IRCv3.2'
+
+    @classmethod
+    def of_name(cls, name):
+        name = name.upper()
+        for spec in cls:
+            if spec.value.upper() == name:
+                return spec
+        raise ValueError(name)