feat: pull request backporting

feat: backport still open pull requests

test/service/git/github/github-service.test.ts

@@ -0,0 +1,40 @@
+import GitServiceFactory from "@bp/service/git/git-service-factory";
+import { GitPullRequest, GitServiceType } from "@bp/service/git/git.types";
+import GitHubService from "@bp/service/git/github/github-service";
+import { mergedPullRequestFixture, repo, targetOwner } from "../../../support/moctokit/moctokit-data";
+import { setupMoctokit } from "../../../support/moctokit/moctokit-support";
+
+describe("github service", () => {
+
+  let gitService: GitHubService;
+
+  beforeAll(() => {
+    // init git service
+    GitServiceFactory.init(GitServiceType.GITHUB, "whatever");
+  });
+
+  beforeEach(() => {
+    // mock github api calls
+    setupMoctokit();
+
+    gitService = GitServiceFactory.getService() as GitHubService;
+  });
+
+  test("get pull request: success", async () => {
+    const res: GitPullRequest = await gitService.getPullRequest(targetOwner, repo, mergedPullRequestFixture.number);
+    expect(res.sourceRepo).toEqual({
+      owner: "fork",
+      project: "reponame",
+      cloneUrl: "https://github.com/fork/reponame.git"
+    });
+    expect(res.targetRepo).toEqual({
+      owner: "owner",
+      project: "reponame",
+      cloneUrl: "https://github.com/owner/reponame.git"
+    });
+    expect(res.title).toBe("PR Title");
+    expect(res.commits.length).toBe(1);
+    expect(res.commits).toEqual(["28f63db774185f4ec4b57cd9aaeb12dbfb4c9ecc"]);
+  });
+
+});