Define some filler initial rooms for testing.

src/modules/room/slice.ts

@@ -21,8 +21,8 @@ export interface Room {
   operated: boolean;
   userCount: number;
   owner: string;
-  operators: Set<string>;
-  members: Set<string>;
+  operators: string[];
+  members: string[];
   messages: RoomMessage[];
   tickers: string[];
   // showUsers: boolean;
@@ -37,7 +37,34 @@ export interface RoomSliceState {
 }
 
 const initialState: RoomSliceState = {
-  rooms: {},
+  // TODO: Set to {} once RoomListResponse actually comes. Until then, it helps
+  // to have some state that we can observe in the UI.
+  rooms: {
+    bleep: {
+      name: "bleep",
+      membership: RoomMembership.Joined,
+      visibility: "public",
+      operated: false,
+      userCount: 2,
+      owner: "",
+      operators: [],
+      members: [],
+      messages: [],
+      tickers: [],
+    },
+    bloop: {
+      name: "bloop",
+      membership: RoomMembership.Left,
+      visibility: "public",
+      operated: false,
+      userCount: 2,
+      owner: "",
+      operators: [],
+      members: [],
+      messages: [],
+      tickers: [],
+    },
+  },
 };
 
 export interface RoomMessagePayload {