Fix xcmp message processing condition. (#510)

* Fix xcmp message processing condition.

* add a very simple test

* Update Cargo.lock

* remove comment

* remove comment

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Alexander Popiak <alexander.popiak@gmail.com>

cumulus/pallets/xcmp-queue/src/lib.rs

@@ -25,6 +25,12 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
+#[cfg(test)]
+mod mock;
+
+#[cfg(test)]
+mod tests;
+
 use codec::{Decode, Encode};
 use cumulus_primitives_core::{
 	relay_chain::BlockNumber as RelayBlockNumber, ChannelStatus, GetChannelInfo, MessageSendError,
@@ -203,7 +209,7 @@ pub enum ChannelSignal {
 }
 
 /// The aggregate XCMP message format.
-#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode, RuntimeDebug)]
 pub enum XcmpMessageFormat {
 	/// Encoded `VersionedXcm` messages, all concatenated.
 	ConcatenatedVersionedXcm,
@@ -552,7 +558,7 @@ impl<T: Config> Pallet<T> {
 			// If there are more and we're making progress, we process them after we've given the
 			// other channels a look in. If we've still not unlocked all weight, then we set them
 			// up for processing a second time anyway.
-			if !status[index].2.is_empty() && weight_processed > 0 || weight_available != max_weight
+			if !status[index].2.is_empty() && (weight_processed > 0 || weight_available != max_weight)
 			{
 				if shuffle_index + 1 == shuffled.len() {
 					// Only this queue left. Just run around this loop once more.