Fix lints after rebase

src/backends/googlepubsub/mod.rs

@@ -70,7 +70,6 @@ macro_rules! match_fields {
                     }) => {},
                     None => {}
                 };
-                ()
             };
         }
     }

src/backends/googlepubsub/publisher.rs

@@ -79,7 +79,7 @@ where
     ///
     /// See the GCP documentation on topics [here](https://cloud.google.com/pubsub/docs/admin)
     pub async fn create_topic(&mut self, topic: TopicConfig<'_>) -> Result<(), PubSubError> {
-        let topic = topic.into_topic(&self);
+        let topic = topic.into_topic(self);
         self.client.create_topic(topic).await?;
 
         Ok(())

src/backends/mock.rs

@@ -75,6 +75,12 @@ impl MockPublisher {
     }
 }
 
+impl Default for MockPublisher {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<M> crate::Publisher<M> for MockPublisher
 where
     M: crate::EncodableMessage,
@@ -87,10 +93,12 @@ where
     }
 }
 
+type Subscriptions = BTreeMap<MockSubscription, Channel<ValidatedMessage>>;
+
 /// The sink used by the `MockPublisher`
 #[derive(Debug, Clone)]
 pub struct MockSink {
-    topics: Arc<Mutex<BTreeMap<Topic, BTreeMap<MockSubscription, Channel<ValidatedMessage>>>>>,
+    topics: Arc<Mutex<BTreeMap<Topic, Subscriptions>>>,
 }
 
 #[derive(Debug, Clone)]
@@ -115,7 +123,7 @@ impl sink::Sink<(Topic, ValidatedMessage)> for MockSink {
         // send the message to every subscription listening on the given topic
 
         // find the subscriptions for this topic
-        let subscriptions = topics.entry(topic).or_insert(BTreeMap::new());
+        let subscriptions = topics.entry(topic).or_insert_with(Subscriptions::new);
 
         // Send to every subscription that still has consumers. If a subscription's consumers are
         // all dropped, the channel will have been closed and should be removed from the list

src/topic.rs

@@ -16,6 +16,6 @@ impl From<&'static str> for Topic {
 
 impl AsRef<str> for Topic {
     fn as_ref(&self) -> &str {
-        &self.0
+        self.0
     }
 }