test: more tests

packages/vite/src/node/server/ws.ts

@@ -66,6 +66,8 @@ export interface WebSocketServer {
   off: WebSocketTypes.Server['off'] & {
     (event: string, listener: Function): void
   }
+
+  emit(...args: any[]): void
 }
 
 export interface WebSocketClient {
@@ -280,6 +282,18 @@ export function createWebSocketServer(
       })
     },
 
+    // TODO: remove when multiple hmr cliens are merged
+    emit(event, payload) {
+      customListeners.get(event)?.forEach((fn) =>
+        fn(payload.data, {
+          socket: {} as any,
+          send: () => {
+            //
+          },
+        }),
+      )
+    },
+
     close() {
       // should remove listener if hmr.server is set
       // otherwise the old listener swallows all WebSocket connections

packages/vite/src/node/ssr/runtime/runtime.ts

@@ -91,6 +91,22 @@ export class ViteRuntime {
     this.hmrClient?.clear()
   }
 
+  // TODO - what if it's a virtual module(?)
+  public resolveIdToFilepath(id: string): string {
+    if (this.moduleCache.has(id)) {
+      return id
+    }
+    const file = this.idToFileMap.get(id)
+    if (file && this.moduleCache.has(file)) {
+      return file
+    }
+    const resolved = posixResolve(
+      this.options.root,
+      id[0] === '/' ? id.slice(1) : id,
+    )
+    return resolved
+  }
+
   private async cachedRequest(
     id: string,
     fetchedModule: FetchResult,