Some improvements

- Use classes
- Split buildx/builder modules
- Additional tests

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

__tests__/github.test.ts

@@ -1,14 +1,41 @@
 import {describe, expect, jest, it} from '@jest/globals';
-import * as github from '../src/github';
+import {Context} from '@actions/github/lib/context';
+
+import {GitHub, Payload, ReposGetResponseData} from '../src/github';
+
+jest.spyOn(GitHub.prototype, 'context').mockImplementation((): Context => {
+  return new Context();
+});
 
 import * as repoFixture from './fixtures/repo.json';
-jest.spyOn(github, 'repo').mockImplementation((): Promise<github.ReposGetResponseData> => {
-  return <Promise<github.ReposGetResponseData>>(repoFixture as unknown);
+jest.spyOn(GitHub.prototype, 'repo').mockImplementation((): Promise<ReposGetResponseData> => {
+  return <Promise<ReposGetResponseData>>(repoFixture as unknown);
+});
+
+import * as payloadFixture from './fixtures/github-payload.json';
+jest.spyOn(GitHub.prototype as any, 'payload').mockImplementation((): Promise<Payload> => {
+  return <Promise<Payload>>(payloadFixture as unknown);
+});
+jest.spyOn(GitHub.prototype as any, 'ref').mockImplementation((): string => {
+  return 'refs/heads/master';
+});
+
+describe('gitContext', () => {
+  it('returns refs/heads/master', async () => {
+    expect(GitHub.getInstance().gitContext()).toEqual('https://github.com/docker/test-docker-action.git#refs/heads/master');
+  });
 });
 
 describe('repo', () => {
   it('returns GitHub repository', async () => {
-    const repo = await github.repo(process.env.GITHUB_TOKEN || '');
-    expect(repo.name).not.toBeNull();
+    const repo = await GitHub.getInstance().repo(process.env.GITHUB_TOKEN || '');
+    expect(repo.name).toEqual('Hello-World');
+  });
+});
+
+describe('fromPayload', () => {
+  it('returns repository name from payload', async () => {
+    const repoName = await GitHub.getInstance().fromPayload('repository.name');
+    expect(repoName).toEqual('test-docker-action');
   });
 });