diff --git a/src/dbus/client.rs b/src/dbus/client.rs
index 8de0ba8..fbd3c73 100644
--- a/src/dbus/client.rs
+++ b/src/dbus/client.rs
@@ -75,6 +75,7 @@ impl Client {
     }
 
     /// The underlying connection.
+    #[must_use]
     pub const fn connection(&self) -> &Connection {
         &self.connection
     }
diff --git a/src/lib.rs b/src/lib.rs
index ea2eb70..95337a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,6 +24,6 @@ mod tests {
 
     #[test]
     fn version_is_not_empty() {
-        assert!(!VERSION.is_empty());
+        assert_ne!(VERSION, "");
     }
 }
diff --git a/tests/dbus.rs b/tests/dbus.rs
index 35a4a4f..99bc493 100644
--- a/tests/dbus.rs
+++ b/tests/dbus.rs
@@ -111,7 +111,7 @@ async fn invalid_rules_never_reach_the_daemon() {
         .await
         .unwrap_err();
     assert!(matches!(err, AppError::Parse(_)));
-    assert!(mock.calls().is_empty());
+    assert_eq!(mock.calls(), Vec::<String>::new(), "nothing may be sent");
 }
 
 #[tokio::test]