test: README authentication example

Author: gr2m

test/request.test.ts

@@ -1,6 +1,8 @@
 import { getUserAgent } from "universal-user-agent";
 import fetchMock from "fetch-mock";
 import { Headers, RequestInit } from "node-fetch";
+import { createAppAuth } from "@octokit/auth-app";
+import lolex from "lolex";
 
 import { request } from "../src";
 import {
@@ -62,6 +64,98 @@ describe("request()", () => {
     });
   });
 
+  it("README authentication example", async () => {
+    const clock = lolex.install({
+      now: 0,
+      toFake: ["Date"]
+    });
+    const APP_ID = 1;
+    const PRIVATE_KEY = `-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA1c7+9z5Pad7OejecsQ0bu3aozN3tihPmljnnudb9G3HECdnH
+lWu2/a1gB9JW5TBQ+AVpum9Okx7KfqkfBKL9mcHgSL0yWMdjMfNOqNtrQqKlN4kE
+p6RD++7sGbzbfZ9arwrlD/HSDAWGdGGJTSOBM6pHehyLmSC3DJoR/CTu0vTGTWXQ
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+ye+Qjtius0Md4Nie4+X8kwVI2Qjk3dSm0sw/720KJkdVDmrayeljtKBx6AtNQsSX
+gzQbeMmiqFFkwrG1+zx6E7H7jqIQ9B6bvWKXGwIDAQABAoIBAD8kBBPL6PPhAqUB
+K1r1/gycfDkUCQRP4DbZHt+458JlFHm8QL6VstKzkrp8mYDRhffY0WJnYJL98tr4
+4tohsDbqFGwmw2mIaHjl24LuWXyyP4xpAGDpl9IcusjXBxLQLp2m4AKXbWpzb0OL
+Ulrfc1ZooPck2uz7xlMIZOtLlOPjLz2DuejVe24JcwwHzrQWKOfA11R/9e50DVse
+hnSH/w46Q763y4I0E3BIoUMsolEKzh2ydAAyzkgabGQBUuamZotNfvJoDXeCi1LD
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+ns1ScdhP6upo9I0/sRsIuN96Gb65JJx94gQ4k9MCgYBO5V6gA2aMQvZAFLUicgzT
+u/vGea+oYv7tQfaW0J8E/6PYwwaX93Y7Q3QNXCoCzJX5fsNnoFf36mIThGHGiHY6
+y5bZPPWFDI3hUMa1Hu/35XS85kYOP6sGJjf4kTLyirEcNKJUWH7CXY+00cwvTkOC
+S4Iz64Aas8AilIhRZ1m3eQKBgQCUW1s9azQRxgeZGFrzC3R340LL530aCeta/6FW
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+9/49J6WTD++EajN7FhktUSYxukdWaCocAQJTDNYP0K88G4rtC2IYy5JFn9SWz5oh
+x//0u+zd/R/QRUzLOw4N72/Hu+UG6MNt5iDZFCtapRaKt6OvSBwy8w==
+-----END RSA PRIVATE KEY-----`;
+    // see https://runkit.com/gr2m/reproducable-jwt
+    const BEARER =
+      "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpYXQiOi0zMCwiZXhwIjo1NzAsImlzcyI6MX0.q3foRa78U3WegM5PrWLEh5N0bH1SD62OqW66ZYzArp95JBNiCbo8KAlGtiRENCIfBZT9ibDUWy82cI4g3F09mdTq3bD1xLavIfmTksIQCz5EymTWR5v6gL14LSmQdWY9lSqkgUG0XCFljWUglEP39H4yeHbFgdjvAYg3ifDS12z9oQz2ACdSpvxPiTuCC804HkPVw8Qoy0OSXvCkFU70l7VXCVUxnuhHnk8-oCGcKUspmeP6UdDnXk-Aus-eGwDfJbU2WritxxaXw6B4a3flTPojkYLSkPBr6Pi0H2-mBsW_Nvs0aLPVLKobQd4gqTkosX3967DoAG8luUMhrnxe8Q";
+    const mock = fetchMock
+      .sandbox()
+      .postOnce("https://api.github.com/app/installations/123/access_tokens", {
+        token: "secret123",
+        expires_at: "1970-01-01T01:00:00.000Z",
+        permissions: {
+          metadata: "read"
+        },
+        repository_selection: "all"
+      })
+      .getOnce(
+        "https://api.github.com/app",
+        { id: 123 },
+        {
+          headers: {
+            accept: "application/vnd.github.machine-man-preview+json",
+            "user-agent": userAgent,
+            authorization: `bearer ${BEARER}`
+          }
+        }
+      )
+      .postOnce(
+        "https://api.github.com/repos/octocat/hello-world/issues",
+        { id: 456 },
+        {
+          headers: {
+            accept: "application/vnd.github.machine-man-preview+json",
+            "user-agent": userAgent,
+            authorization: `token secret123`
+          }
+        }
+      );
+    const auth = createAppAuth({
+      id: APP_ID,
+      privateKey: PRIVATE_KEY,
+      installationId: 123
+    });
+    const requestWithAuth = request.defaults({
+      mediaType: {
+        previews: ["machine-man"]
+      },
+      request: {
+        fetch: mock,
+        hook: auth.hook
+      }
+    });
+    await requestWithAuth("GET /app");
+    await requestWithAuth("POST /repos/:owner/:repo/issues", {
+      owner: "octocat",
+      repo: "hello-world",
+      title: "Hello from the engine room"
+    });
+    expect(mock.done()).toBe(true);
+    clock.reset();
+  });
+
   it("Request with body", () => {
     const mock = fetchMock
       .sandbox()