feat: fallback to raw endpoint for manifest when rate limit is reached (#766)

__tests__/install-python.test.ts

@@ -0,0 +1,58 @@
+import {
+  getManifest,
+  getManifestFromRepo,
+  getManifestFromURL
+} from '../src/install-python';
+import * as httpm from '@actions/http-client';
+import * as tc from '@actions/tool-cache';
+
+jest.mock('@actions/http-client');
+jest.mock('@actions/tool-cache');
+
+const mockManifest = [{version: '1.0.0'}];
+
+describe('getManifest', () => {
+  it('should return manifest from repo', async () => {
+    (tc.getManifestFromRepo as jest.Mock).mockResolvedValue(mockManifest);
+    const manifest = await getManifest();
+    expect(manifest).toEqual(mockManifest);
+  });
+
+  it('should return manifest from URL if repo fetch fails', async () => {
+    (tc.getManifestFromRepo as jest.Mock).mockRejectedValue(
+      new Error('Fetch failed')
+    );
+    (httpm.HttpClient.prototype.getJson as jest.Mock).mockResolvedValue({
+      result: mockManifest
+    });
+    const manifest = await getManifest();
+    expect(manifest).toEqual(mockManifest);
+  });
+});
+
+describe('getManifestFromRepo', () => {
+  it('should return manifest from repo', async () => {
+    (tc.getManifestFromRepo as jest.Mock).mockResolvedValue(mockManifest);
+    const manifest = await getManifestFromRepo();
+    expect(manifest).toEqual(mockManifest);
+  });
+});
+
+describe('getManifestFromURL', () => {
+  it('should return manifest from URL', async () => {
+    (httpm.HttpClient.prototype.getJson as jest.Mock).mockResolvedValue({
+      result: mockManifest
+    });
+    const manifest = await getManifestFromURL();
+    expect(manifest).toEqual(mockManifest);
+  });
+
+  it('should throw error if unable to get manifest from URL', async () => {
+    (httpm.HttpClient.prototype.getJson as jest.Mock).mockResolvedValue({
+      result: null
+    });
+    await expect(getManifestFromURL()).rejects.toThrow(
+      'Unable to get manifest from'
+    );
+  });
+});