Pre releases (#10752)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/cli/src/config/extensions/github.test.ts

@@ -10,6 +10,7 @@ import {
   cloneFromGit,
   extractFile,
   findReleaseAsset,
+  fetchReleaseFromGithub,
   parseGitHubRepoForReleases,
 } from './github.js';
 import { simpleGit, type SimpleGit } from 'simple-git';
@@ -35,6 +36,15 @@ vi.mock('node:os', async (importOriginal) => {
 
 vi.mock('simple-git');
 
+const fetchJsonMock = vi.hoisted(() => vi.fn());
+vi.mock('./github_fetch.js', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('./github_fetch.js')>();
+  return {
+    ...actual,
+    fetchJson: fetchJsonMock,
+  };
+});
+
 describe('git extension helpers', () => {
   afterEach(() => {
     vi.restoreAllMocks();
@@ -223,6 +233,66 @@ describe('git extension helpers', () => {
     });
   });
 
+  describe('fetchReleaseFromGithub', () => {
+    it('should fetch the latest release if allowPreRelease is true', async () => {
+      const releases = [{ tag_name: 'v1.0.0-alpha' }, { tag_name: 'v0.9.0' }];
+      fetchJsonMock.mockResolvedValueOnce(releases);
+
+      const result = await fetchReleaseFromGithub(
+        'owner',
+        'repo',
+        undefined,
+        true,
+      );
+
+      expect(fetchJsonMock).toHaveBeenCalledWith(
+        'https://api.github.com/repos/owner/repo/releases?per_page=1',
+      );
+      expect(result).toEqual(releases[0]);
+    });
+
+    it('should fetch the latest release if allowPreRelease is false', async () => {
+      const release = { tag_name: 'v0.9.0' };
+      fetchJsonMock.mockResolvedValueOnce(release);
+
+      const result = await fetchReleaseFromGithub(
+        'owner',
+        'repo',
+        undefined,
+        false,
+      );
+
+      expect(fetchJsonMock).toHaveBeenCalledWith(
+        'https://api.github.com/repos/owner/repo/releases/latest',
+      );
+      expect(result).toEqual(release);
+    });
+
+    it('should fetch a release by tag if ref is provided', async () => {
+      const release = { tag_name: 'v0.9.0' };
+      fetchJsonMock.mockResolvedValueOnce(release);
+
+      const result = await fetchReleaseFromGithub('owner', 'repo', 'v0.9.0');
+
+      expect(fetchJsonMock).toHaveBeenCalledWith(
+        'https://api.github.com/repos/owner/repo/releases/tags/v0.9.0',
+      );
+      expect(result).toEqual(release);
+    });
+
+    it('should fetch latest stable release if allowPreRelease is undefined', async () => {
+      const release = { tag_name: 'v0.9.0' };
+      fetchJsonMock.mockResolvedValueOnce(release);
+
+      const result = await fetchReleaseFromGithub('owner', 'repo');
+
+      expect(fetchJsonMock).toHaveBeenCalledWith(
+        'https://api.github.com/repos/owner/repo/releases/latest',
+      );
+      expect(result).toEqual(release);
+    });
+  });
+
   describe('findReleaseAsset', () => {
     const assets = [
       { name: 'darwin.arm64.extension.tar.gz', browser_download_url: 'url1' },