Fix a few Windows tests (#19773)

crates/editor/src/test/editor_lsp_test_context.rs

@@ -1,6 +1,7 @@
 use std::{
     borrow::Cow,
     ops::{Deref, DerefMut, Range},
+    path::Path,
     sync::Arc,
 };
 
@@ -66,10 +67,12 @@ impl EditorLspTestContext {
         );
         language_registry.add(Arc::new(language));
 
+        let root = Self::root_path();
+
         app_state
             .fs
             .as_fake()
-            .insert_tree("/root", json!({ "dir": { file_name.clone(): "" }}))
+            .insert_tree(root, json!({ "dir": { file_name.clone(): "" }}))
             .await;
 
         let window = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
@@ -79,7 +82,7 @@ impl EditorLspTestContext {
         let mut cx = VisualTestContext::from_window(*window.deref(), cx);
         project
             .update(&mut cx, |project, cx| {
-                project.find_or_create_worktree("/root", true, cx)
+                project.find_or_create_worktree(root, true, cx)
             })
             .await
             .unwrap();
@@ -108,7 +111,7 @@ impl EditorLspTestContext {
             },
             lsp,
             workspace,
-            buffer_lsp_url: lsp::Url::from_file_path(format!("/root/dir/{file_name}")).unwrap(),
+            buffer_lsp_url: lsp::Url::from_file_path(root.join("dir").join(file_name)).unwrap(),
         }
     }
 
@@ -310,6 +313,16 @@ impl EditorLspTestContext {
     pub fn notify<T: notification::Notification>(&self, params: T::Params) {
         self.lsp.notify::<T>(params);
     }
+
+    #[cfg(target_os = "windows")]
+    fn root_path() -> &'static Path {
+        Path::new("C:\\root")
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    fn root_path() -> &'static Path {
+        Path::new("/root")
+    }
 }
 
 impl Deref for EditorLspTestContext {

crates/fs/src/fs.rs

@@ -865,14 +865,20 @@ impl FakeFsState {
         let mut entry_stack = Vec::new();
         'outer: loop {
             let mut path_components = path.components().peekable();
+            let mut prefix = None;
             while let Some(component) = path_components.next() {
                 match component {
-                    Component::Prefix(_) => panic!("prefix paths aren't supported"),
+                    Component::Prefix(prefix_component) => prefix = Some(prefix_component),
                     Component::RootDir => {
                         entry_stack.clear();
                         entry_stack.push(self.root.clone());
                         canonical_path.clear();
-                        canonical_path.push("/");
+                        match prefix {
+                            Some(prefix_component) => {
+                                canonical_path.push(prefix_component.as_os_str());
+                            }
+                            None => canonical_path.push("/"),
+                        }
                     }
                     Component::CurDir => {}
                     Component::ParentDir => {
@@ -1384,11 +1390,12 @@ impl Fs for FakeFs {
         let mut created_dirs = Vec::new();
         let mut cur_path = PathBuf::new();
         for component in path.components() {
-            let mut state = self.state.lock();
+            let should_skip = matches!(component, Component::Prefix(..) | Component::RootDir);
             cur_path.push(component);
-            if cur_path == Path::new("/") {
+            if should_skip {
                 continue;
             }
+            let mut state = self.state.lock();
 
             let inode = state.next_inode;
             let mtime = state.next_mtime;

crates/lsp/src/lsp.rs

@@ -1177,6 +1177,8 @@ impl FakeLanguageServer {
         let (stdout_writer, stdout_reader) = async_pipe::pipe();
         let (notifications_tx, notifications_rx) = channel::unbounded();
 
+        let root = Self::root_path();
+
         let mut server = LanguageServer::new_internal(
             server_id,
             stdin_writer,
@@ -1184,8 +1186,8 @@ impl FakeLanguageServer {
             None::<async_pipe::PipeReader>,
             Arc::new(Mutex::new(None)),
             None,
-            Path::new("/"),
-            Path::new("/"),
+            root,
+            root,
             None,
             cx.clone(),
             |_| {},
@@ -1201,8 +1203,8 @@ impl FakeLanguageServer {
                     None::<async_pipe::PipeReader>,
                     Arc::new(Mutex::new(None)),
                     None,
-                    Path::new("/"),
-                    Path::new("/"),
+                    root,
+                    root,
                     None,
                     cx,
                     move |msg| {
@@ -1238,6 +1240,16 @@ impl FakeLanguageServer {
 
         (server, fake)
     }
+
+    #[cfg(target_os = "windows")]
+    fn root_path() -> &'static Path {
+        Path::new("C:\\")
+    }
+
+    #[cfg(not(target_os = "windows"))]
+    fn root_path() -> &'static Path {
+        Path::new("/")
+    }
 }
 
 #[cfg(any(test, feature = "test-support"))]