Add test coverage for FS events happening inside unloaded dirs

crates/fs/src/fs.rs

@@ -388,6 +388,7 @@ struct FakeFsState {
     event_txs: Vec<smol::channel::Sender<Vec<fsevent::Event>>>,
     events_paused: bool,
     buffered_events: Vec<fsevent::Event>,
+    metadata_call_count: usize,
     read_dir_call_count: usize,
 }
 
@@ -538,6 +539,7 @@ impl FakeFs {
                 buffered_events: Vec::new(),
                 events_paused: false,
                 read_dir_call_count: 0,
+                metadata_call_count: 0,
             }),
         })
     }
@@ -774,10 +776,16 @@ impl FakeFs {
         result
     }
 
+    /// How many `read_dir` calls have been issued.
     pub fn read_dir_call_count(&self) -> usize {
         self.state.lock().read_dir_call_count
     }
 
+    /// How many `metadata` calls have been issued.
+    pub fn metadata_call_count(&self) -> usize {
+        self.state.lock().metadata_call_count
+    }
+
     async fn simulate_random_delay(&self) {
         self.executor
             .upgrade()
@@ -1098,7 +1106,8 @@ impl Fs for FakeFs {
     async fn metadata(&self, path: &Path) -> Result<Option<Metadata>> {
         self.simulate_random_delay().await;
         let path = normalize_path(path);
-        let state = self.state.lock();
+        let mut state = self.state.lock();
+        state.metadata_call_count += 1;
         if let Some((mut entry, _)) = state.try_read_path(&path, false) {
             let is_symlink = entry.lock().is_symlink();
             if is_symlink {