feat: Implement /setup-github command (#5069)

packages/cli/src/ui/commands/setupGithubCommand.test.ts

@@ -0,0 +1,66 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { vi, describe, expect, it, afterEach, beforeEach } from 'vitest';
+import * as child_process from 'child_process';
+import { setupGithubCommand } from './setupGithubCommand.js';
+import { CommandContext, ToolActionReturn } from './types.js';
+
+vi.mock('child_process');
+
+describe('setupGithubCommand', () => {
+  beforeEach(() => {
+    vi.resetAllMocks();
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('returns a tool action to download github workflows and handles paths', () => {
+    const fakeRepoRoot = '/github.com/fake/repo/root';
+    vi.mocked(child_process.execSync).mockReturnValue(fakeRepoRoot);
+
+    const result = setupGithubCommand.action?.(
+      {} as CommandContext,
+      '',
+    ) as ToolActionReturn;
+
+    expect(result.type).toBe('tool');
+    expect(result.toolName).toBe('run_shell_command');
+    expect(child_process.execSync).toHaveBeenCalledWith(
+      'git rev-parse --show-toplevel',
+      {
+        encoding: 'utf-8',
+      },
+    );
+    expect(child_process.execSync).toHaveBeenCalledWith('git remote -v', {
+      encoding: 'utf-8',
+    });
+
+    const { command } = result.toolArgs;
+
+    const expectedSubstrings = [
+      `mkdir -p "${fakeRepoRoot}/.github/workflows"`,
+      `curl -fsSL -o "${fakeRepoRoot}/.github/workflows/gemini-cli.yml"`,
+      `curl -fsSL -o "${fakeRepoRoot}/.github/workflows/gemini-issue-automated-triage.yml"`,
+      `curl -fsSL -o "${fakeRepoRoot}/.github/workflows/gemini-issue-scheduled-triage.yml"`,
+      `curl -fsSL -o "${fakeRepoRoot}/.github/workflows/gemini-pr-review.yml"`,
+      'https://raw.githubusercontent.com/google-github-actions/run-gemini-cli/refs/heads/main/workflows/',
+    ];
+
+    for (const substring of expectedSubstrings) {
+      expect(command).toContain(substring);
+    }
+  });
+
+  it('throws an error if git root cannot be determined', () => {
+    vi.mocked(child_process.execSync).mockReturnValue('');
+    expect(() => {
+      setupGithubCommand.action?.({} as CommandContext, '');
+    }).toThrow('Unable to determine the Git root directory.');
+  });
+});