test(chat-machine): add test for ignoring repeated user login during active session

src/stores/chat/__tests__/chat-machine.transitions.test.ts

@@ -164,6 +164,30 @@ describe("chatMachine transitions", () => {
     actor.stop();
   });
 
+  it("ignores repeated user login while an authenticated user session is active", async () => {
+    const actor = createActor(createTestChatMachine()).start();
+
+    actor.send({ type: "ChatUserLogin", token: "token" });
+    await waitFor(actor, (snapshot) =>
+      snapshot.matches({ userSession: "ready" }),
+    );
+
+    actor.send({ type: "ChatSendMessage", content: "keep this message" });
+    await waitFor(
+      actor,
+      (snapshot) => snapshot.context.messages.length === 1,
+    );
+
+    actor.send({ type: "ChatUserLogin", token: "another-token" });
+
+    expect(actor.getSnapshot().matches({ userSession: "ready" })).toBe(true);
+    expect(actor.getSnapshot().context.messages).toMatchObject([
+      { content: "keep this message", isFromAI: false },
+    ]);
+
+    actor.stop();
+  });
+
   it("allows multiple messages to be queued without leaving ready state", async () => {
     const actor = createActor(createTestChatMachine()).start();