chore: Add first test for GithubCustomResource (#5) (#30)

We added a basic test during our [Hackergarten Meetup](https://www.meetup.com/de-DE/hackergarten-stuttgart/events/dvvlwsydcpbcb/).

test/github-custom-resource.test.ts

@@ -1,3 +1,53 @@
+import { App, Stack } from "aws-cdk-lib";
+import { Match, Template } from "aws-cdk-lib/assertions";
+import { Secret } from "aws-cdk-lib/aws-secretsmanager";
+import { Construct } from "constructs";
+import { AuthOptions } from "../src/auth";
+import { GithubCustomResource } from "../src/github-custom-resource";
+
 describe("GithubCustomResource", () => {
-  it("", () => {});
+  it("Should match snapshot", () => {
+    // Given
+    const app = new App();
+    const stack = new GithubCustomResourceTestStack(app, "GithubTestStack");
+
+    // When
+    const template = Template.fromStack(stack);
+
+    // Then
+    expect(template).toMatchSnapshot();
+  });
+
+  it("Should contain GithubCustomResource with appAuth", () => {
+    // Given
+    const app = new App();
+    const stack = new GithubCustomResourceTestStack(app, "GithubTestStack");
+
+    // When
+    const template = Template.fromStack(stack);
+
+    // Then
+    template.hasResourceProperties("AWS::SecretsManager::Secret", { Description: "GithubAppAuthSecret" });
+    template.hasResourceProperties("AWS::CloudFormation::CustomResource", {
+      Auth: {
+        secret: {
+          Ref: Match.stringLikeRegexp("githubAuthSecret"),
+        },
+        strategy: "auth-app",
+      },
+    });
+  });
 });
+
+class GithubCustomResourceTestStack extends Stack {
+  constructor(scope: Construct, id: string) {
+    super(scope, id);
+
+    const secret = new Secret(this, "githubAuthSecret", {
+      description: "GithubAppAuthSecret",
+    });
+    new GithubCustomResource(this, "CR", {
+      authOptions: AuthOptions.appAuth(secret),
+    });
+  }
+}