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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import {
describe,
it,
expect,
vi,
beforeEach,
afterEach,
type Mocked,
} from 'vitest';
import { AcpFileSystemService } from './acpFileSystemService.js';
import type { AgentSideConnection } from '@agentclientprotocol/sdk';
import type { FileSystemService } from '@google/gemini-cli-core';
import os from 'node:os';
vi.mock('node:os', () => ({
default: {
homedir: vi.fn(),
},
}));
describe('AcpFileSystemService', () => {
let mockConnection: Mocked<AgentSideConnection>;
let mockFallback: Mocked<FileSystemService>;
let service: AcpFileSystemService;
beforeEach(() => {
mockConnection = {
requestPermission: vi.fn(),
sessionUpdate: vi.fn(),
writeTextFile: vi.fn(),
readTextFile: vi.fn(),
} as unknown as Mocked<AgentSideConnection>;
mockFallback = {
readTextFile: vi.fn(),
writeTextFile: vi.fn(),
};
vi.mocked(os.homedir).mockReturnValue('/home/user');
});
afterEach(() => {
vi.restoreAllMocks();
});
describe('readTextFile', () => {
it.each([
{
capability: true,
path: '/path/to/file',
desc: 'connection if capability exists and file is inside root',
setup: () => {
mockConnection.readTextFile.mockResolvedValue({ content: 'content' });
},
verify: () => {
expect(mockConnection.readTextFile).toHaveBeenCalledWith({
path: '/path/to/file',
sessionId: 'session-1',
});
expect(mockFallback.readTextFile).not.toHaveBeenCalled();
},
},
{
capability: false,
path: '/path/to/file',
desc: 'fallback if capability missing',
setup: () => {
mockFallback.readTextFile.mockResolvedValue('content');
},
verify: () => {
expect(mockFallback.readTextFile).toHaveBeenCalledWith(
'/path/to/file',
);
expect(mockConnection.readTextFile).not.toHaveBeenCalled();
},
},
{
capability: true,
path: '/outside/file',
desc: 'fallback if capability exists but file is outside root',
setup: () => {
mockFallback.readTextFile.mockResolvedValue('content');
},
verify: () => {
expect(mockFallback.readTextFile).toHaveBeenCalledWith(
'/outside/file',
);
expect(mockConnection.readTextFile).not.toHaveBeenCalled();
},
},
{
capability: true,
path: '/home/user/.gemini/tmp/file.md',
root: '/home/user',
desc: 'fallback if file is inside global gemini dir, even if root overlaps',
setup: () => {
mockFallback.readTextFile.mockResolvedValue('content');
},
verify: () => {
expect(mockFallback.readTextFile).toHaveBeenCalledWith(
'/home/user/.gemini/tmp/file.md',
);
expect(mockConnection.readTextFile).not.toHaveBeenCalled();
},
},
])(
'should use $desc',
async ({ capability, path, root, setup, verify }) => {
service = new AcpFileSystemService(
mockConnection,
'session-1',
{ readTextFile: capability, writeTextFile: true },
mockFallback,
root || '/path/to',
);
setup();
const result = await service.readTextFile(path);
expect(result).toBe('content');
verify();
},
);
it('should throw normalized ENOENT error when readTextFile encounters "Resource not found"', async () => {
service = new AcpFileSystemService(
mockConnection,
'session-1',
{ readTextFile: true, writeTextFile: true },
mockFallback,
'/path/to',
);
mockConnection.readTextFile.mockRejectedValue(
new Error('Resource not found for document'),
);
await expect(
service.readTextFile('/path/to/missing'),
).rejects.toMatchObject({
code: 'ENOENT',
message: 'Resource not found for document',
});
});
});
describe('writeTextFile', () => {
it.each([
{
capability: true,
path: '/path/to/file',
desc: 'connection if capability exists and file is inside root',
verify: () => {
expect(mockConnection.writeTextFile).toHaveBeenCalledWith({
path: '/path/to/file',
content: 'content',
sessionId: 'session-1',
});
expect(mockFallback.writeTextFile).not.toHaveBeenCalled();
},
},
{
capability: false,
path: '/path/to/file',
desc: 'fallback if capability missing',
verify: () => {
expect(mockFallback.writeTextFile).toHaveBeenCalledWith(
'/path/to/file',
'content',
);
expect(mockConnection.writeTextFile).not.toHaveBeenCalled();
},
},
{
capability: true,
path: '/outside/file',
desc: 'fallback if capability exists but file is outside root',
verify: () => {
expect(mockFallback.writeTextFile).toHaveBeenCalledWith(
'/outside/file',
'content',
);
expect(mockConnection.writeTextFile).not.toHaveBeenCalled();
},
},
{
capability: true,
path: '/home/user/.gemini/tmp/file.md',
root: '/home/user',
desc: 'fallback if file is inside global gemini dir, even if root overlaps',
verify: () => {
expect(mockFallback.writeTextFile).toHaveBeenCalledWith(
'/home/user/.gemini/tmp/file.md',
'content',
);
expect(mockConnection.writeTextFile).not.toHaveBeenCalled();
},
},
])('should use $desc', async ({ capability, path, root, verify }) => {
service = new AcpFileSystemService(
mockConnection,
'session-1',
{ writeTextFile: capability, readTextFile: true },
mockFallback,
root || '/path/to',
);
await service.writeTextFile(path, 'content');
verify();
});
it('should throw normalized ENOENT error when writeTextFile encounters "Resource not found"', async () => {
service = new AcpFileSystemService(
mockConnection,
'session-1',
{ readTextFile: true, writeTextFile: true },
mockFallback,
'/path/to',
);
mockConnection.writeTextFile.mockRejectedValue(
new Error('Resource not found for directory'),
);
await expect(
service.writeTextFile('/path/to/missing', 'content'),
).rejects.toMatchObject({
code: 'ENOENT',
message: 'Resource not found for directory',
});
});
});
});
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