tests: Don't assert connection key equality

The format of the connection key is not public, and we reserve the right
to change it server-side as we please, the only functionality the client
expects is that providing the connection key of a previous connection
results in the new connection having the same id, so that's all we need
to test.

Signed-off-by: Lewis Marshall <[email protected]>

ably/realtime_conn_spec_integration_test.go

@@ -1947,9 +1947,8 @@ func TestRealtimeConn_RTN16(t *testing.T) {
 	assert.NoError(t, err)
 
 	{ // RTN16f, RTN16j, RTN16d
-		assert.True(t, sameConnection(client.Connection.Key(), c.Connection.Key()),
+		assert.Equal(t, prevConnId, c.Connection.ID(),
 			"expected the same connection")
-		assert.Equal(t, prevConnId, c.Connection.ID())
 		assert.Nil(t, client.Connection.ErrorReason())
 		assert.Equal(t, prevMsgSerial, client.Connection.MsgSerial(),
 			"expected %d got %d", prevMsgSerial, client.Connection.MsgSerial())
@@ -2006,10 +2005,6 @@ func TestRealtimeConn_RTN16(t *testing.T) {
 	}
 }
 
-func sameConnection(a, b string) bool {
-	return strings.Split(a, "-")[0] == strings.Split(b, "-")[0]
-}
-
 func TestRealtimeConn_RTN23(t *testing.T) {
 	connDetails := ably.ConnectionDetails{
 		ConnectionKey:      "foo",