Fix shell output display (#24490)

packages/cli/src/ui/hooks/useExecutionLifecycle.test.tsx

@@ -101,6 +101,7 @@ import {
   type GeminiClient,
   type ShellExecutionResult,
   type ShellOutputEvent,
+  type AnsiOutput,
   CoreToolCallStatus,
 } from '@google/gemini-cli-core';
 import * as fs from 'node:fs';
@@ -521,6 +522,52 @@ describe('useExecutionLifecycle', () => {
     );
   });
 
+  it('should prepend warnings to AnsiOutput array', async () => {
+    const { result } = await renderProcessorHook();
+
+    act(() => {
+      result.current.handleShellCommand('ls', new AbortController().signal);
+    });
+    const execPromise = onExecMock.mock.calls[0][0];
+
+    const ansiOutput: AnsiOutput = [
+      [
+        {
+          text: 'ansi line 1',
+          fg: '',
+          bg: '',
+          bold: false,
+          dim: false,
+          italic: false,
+          underline: false,
+          inverse: false,
+        },
+      ],
+    ];
+
+    act(() => {
+      resolveExecutionPromise(
+        createMockServiceResult({
+          exitCode: 1,
+          output: 'ansi line 1',
+          ansiOutput,
+        }),
+      );
+    });
+    await act(async () => await execPromise);
+
+    expect(setPendingHistoryItemMock).toHaveBeenCalledWith(null);
+    expect(addItemToHistoryMock).toHaveBeenCalledTimes(2);
+
+    const historyCall = addItemToHistoryMock.mock.calls[1][0];
+    const display = historyCall.tools[0].resultDisplay;
+
+    expect(Array.isArray(display)).toBe(true);
+    expect(display.length).toBe(3); // Error line, empty line, original output
+    expect(display[0][0].text).toBe('Command exited with code 1.');
+    expect(display[2][0].text).toBe('ansi line 1');
+  });
+
   it('should handle promise rejection and show an error', async () => {
     const { result } = await renderProcessorHook();
     const testError = new Error('Unexpected failure');