fix: polish Google Chat plugin (#1635) (thanks @iHildy)

Co-authored-by: Ian Hildebrand <ian@jedi.net>

extensions/googlechat/src/api.test.ts

@@ -0,0 +1,62 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import type { ResolvedGoogleChatAccount } from "./accounts.js";
+import { downloadGoogleChatMedia } from "./api.js";
+
+vi.mock("./auth.js", () => ({
+  getGoogleChatAccessToken: vi.fn().mockResolvedValue("token"),
+}));
+
+const account = {
+  accountId: "default",
+  enabled: true,
+  credentialSource: "inline",
+  config: {},
+} as ResolvedGoogleChatAccount;
+
+describe("downloadGoogleChatMedia", () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("rejects when content-length exceeds max bytes", async () => {
+    const body = new ReadableStream({
+      start(controller) {
+        controller.enqueue(new Uint8Array([1, 2, 3]));
+        controller.close();
+      },
+    });
+    const response = new Response(body, {
+      status: 200,
+      headers: { "content-length": "50", "content-type": "application/octet-stream" },
+    });
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(response));
+
+    await expect(
+      downloadGoogleChatMedia({ account, resourceName: "media/123", maxBytes: 10 }),
+    ).rejects.toThrow(/max bytes/i);
+  });
+
+  it("rejects when streamed payload exceeds max bytes", async () => {
+    const chunks = [new Uint8Array(6), new Uint8Array(6)];
+    let index = 0;
+    const body = new ReadableStream({
+      pull(controller) {
+        if (index < chunks.length) {
+          controller.enqueue(chunks[index++]);
+        } else {
+          controller.close();
+        }
+      },
+    });
+    const response = new Response(body, {
+      status: 200,
+      headers: { "content-type": "application/octet-stream" },
+    });
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue(response));
+
+    await expect(
+      downloadGoogleChatMedia({ account, resourceName: "media/123", maxBytes: 10 }),
+    ).rejects.toThrow(/max bytes/i);
+  });
+});