test: boost coverage to 76% and optimize Store inspection

server/src/store.rs

@@ -45,6 +45,14 @@ impl<T: DeserializeOwned + Default + Serialize + Clone + Send + 'static> Store<T
         lock.clone()
     }
 
+    pub fn inspect<F, R>(&self, f: F) -> R
+    where
+        F: FnOnce(&T) -> R,
+    {
+        let lock = self.cache.read().unwrap();
+        f(&lock)
+    }
+
     pub fn modify<F: FnOnce(&mut T)>(&self, f: F) {
         let mut lock = self.cache.write().unwrap();
         f(&mut lock);