Fix Test_votesTracker_getMessagesForBlockHash

lib/grandpa/tracker_votes.go

@@ -146,7 +146,7 @@ func (vt *votesTracker) delete(blockHash common.Hash) {
 
 // getMessagesForBlockHash returns all the vote messages
 // for a particular block hash from the tracker as a slice
-// of networkVoteMessage.
+// of networkVoteMessage. There is no order in the slice.
 // It returns nil if the block hash does not exist.
 func (vt *votesTracker) getMessagesForBlockHash(
 	blockHash common.Hash) (messages []networkVoteMessage) {

lib/grandpa/tracker_votes_test.go

@@ -308,6 +308,13 @@ func Test_votesTracker_getMessagesForBlockHash(t *testing.T) {
 			vt := testCase.votesTracker
 			messages := vt.getMessagesForBlockHash(testCase.blockHash)
 
+			sort.Slice(messages, func(i, j int) bool {
+				if messages[i].from == messages[j].from {
+					return messages[i].msg.Round < messages[j].msg.Round
+				}
+				return messages[i].from < messages[j].from
+			})
+
 			assert.Equal(t, testCase.messages, messages)
 		})
 	}