fix: Add missing tests directory and files

tests/integration/helpers.ts

@@ -0,0 +1,50 @@
+import * as path from 'path';
+import * as fs from 'fs-extra';
+import * as os from 'os';
+import simpleGit from 'simple-git';
+
+export async function setupTestRepo(): Promise<string> {
+  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'gas-test-'));
+  const repoDir = path.join(tempDir, 'test-repo');
+
+  fs.ensureDirSync(repoDir);
+
+  const git = simpleGit(repoDir);
+  await git.init();
+  await git.addConfig('user.email', 'test@example.com');
+  await git.addConfig('user.name', 'Test User');
+
+  fs.writeFileSync(path.join(repoDir, 'README.md'), '# Test Repository\n');
+  await git.add('.');
+  await git.commit('Initial commit');
+
+  return repoDir;
+}
+
+export async function cleanupTestRepo(repoDir: string): Promise<void> {
+  await fs.remove(path.dirname(repoDir));
+}
+
+export function createMockGit() {
+  return {
+    branch: jest.fn().mockResolvedValue({ current: 'main', all: ['main', 'develop'] }),
+    status: jest.fn().mockResolvedValue({
+      modified: [],
+      created: [],
+      deleted: [],
+      staged: [],
+      conflicted: []
+    }),
+    diff: jest.fn().mockResolvedValue(''),
+    raw: jest.fn().mockResolvedValue(''),
+    add: jest.fn().mockResolvedValue({}),
+    commit: jest.fn().mockResolvedValue({}),
+    checkout: jest.fn().mockResolvedValue({}),
+    pull: jest.fn().mockResolvedValue({}),
+    stash: jest.fn().mockResolvedValue({}),
+    log: jest.fn().mockResolvedValue({ latest: null }),
+    worktree: jest.fn().mockResolvedValue({}),
+    init: jest.fn().mockResolvedValue({}),
+    addConfig: jest.fn().mockResolvedValue({})
+  };
+}