perf(test): optimize test suite speed and stability

packages/cli/src/test-utils/AppRig.tsx

@@ -751,7 +751,7 @@ export class AppRig {
     }
 
     await act(async () => {
-      await new Promise((resolve) => setTimeout(resolve, 500));
+      await new Promise((resolve) => setTimeout(resolve, 20));
     });
 
     vi.unstubAllEnvs();

packages/cli/src/test-utils/async.ts

@@ -14,7 +14,7 @@ import { vi } from 'vitest';
 // for React state updates.
 export async function waitFor(
   assertion: () => void | Promise<void>,
-  { timeout = 2000, interval = 50 } = {},
+  { timeout = 2000, interval = 10 } = {},
 ): Promise<void> {
   const startTime = Date.now();
 

packages/cli/src/test-utils/render.tsx

@@ -42,7 +42,7 @@ import {
   type OverflowState,
 } from '../ui/contexts/OverflowContext.js';
 
-import { makeFakeConfig } from '@google/gemini-cli-core';
+import { makeFakeConfig } from '../../../../packages/core/src/test-utils/config.js';
 import { type Config } from '@google/gemini-cli-core';
 import { FakePersistentState } from './persistentStateFake.js';
 import { AppContext, type AppState } from '../ui/contexts/AppContext.js';
@@ -223,7 +223,7 @@ class XtermStdout extends EventEmitter {
             this.once('render', resolve),
           );
           const timeoutPromise = new Promise((resolve) =>
-            setTimeout(resolve, 20),
+            setTimeout(resolve, 5),
           );
           await Promise.race([renderPromise, timeoutPromise]);
         }
@@ -290,9 +290,9 @@ class XtermStdout extends EventEmitter {
       attempts++;
       await act(async () => {
         if (vi.isFakeTimers()) {
-          await vi.advanceTimersByTimeAsync(10);
+          await vi.advanceTimersByTimeAsync(5);
         } else {
-          await new Promise((resolve) => setTimeout(resolve, 10));
+          await new Promise((resolve) => setTimeout(resolve, 5));
         }
       });
     }