lens/src/main/__test__/kube-auth-proxy.test.ts

const logger = {
  silly: jest.fn(),
  debug: jest.fn(),
  log: jest.fn(),
  info: jest.fn(),
  error: jest.fn(),
  crit: jest.fn(),
};

jest.mock("winston", () => ({
  format: {
    colorize: jest.fn(),
    combine: jest.fn(),
    simple: jest.fn(),
    label: jest.fn(),
    timestamp: jest.fn(),
    printf: jest.fn()
  },
  createLogger: jest.fn().mockReturnValue(logger),
  transports: {
    Console: jest.fn(),
    File: jest.fn(),
  }
}));

jest.mock("../../common/ipc");
jest.mock("child_process");
jest.mock("tcp-port-used");

import { Cluster } from "../cluster";
import { KubeAuthProxy } from "../kube-auth-proxy";
import { getFreePort } from "../port";
import { broadcastMessage } from "../../common/ipc";
import { ChildProcess, spawn, SpawnOptions } from "child_process";
import { bundledKubectlPath, Kubectl } from "../kubectl";
import { mock, MockProxy } from 'jest-mock-extended';
import { waitUntilUsed } from 'tcp-port-used';
import { Readable } from "stream";

const mockBroadcastIpc = broadcastMessage as jest.MockedFunction<typeof broadcastMessage>;
const mockSpawn = spawn as jest.MockedFunction<typeof spawn>;
const mockWaitUntilUsed = waitUntilUsed as jest.MockedFunction<typeof waitUntilUsed>;

describe("kube auth proxy tests", () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  it("calling exit multiple times shouldn't throw", async () => {
    const port = await getFreePort();
    const kap = new KubeAuthProxy(new Cluster({ id: "foobar", kubeConfigPath: "fake-path.yml" }), port, {});
    kap.exit();
    kap.exit();
    kap.exit();
  });

  describe("spawn tests", () => {
    let port: number;
    let mockedCP: MockProxy<ChildProcess>;
    let listeners: Record<string, (...args: any[]) => void>;
    let proxy: KubeAuthProxy;

    beforeEach(async () => {
      port = await getFreePort();
      mockedCP = mock<ChildProcess>();
      listeners = {};

      jest.spyOn(Kubectl.prototype, "checkBinary").mockReturnValueOnce(Promise.resolve(true));
      jest.spyOn(Kubectl.prototype, "ensureKubectl").mockReturnValueOnce(Promise.resolve(false));
      mockedCP.on.mockImplementation((event: string, listener: (message: any, sendHandle: any) => void): ChildProcess => {
        listeners[event] = listener;
        return mockedCP;
      });
      mockedCP.stderr = mock<Readable>();
      mockedCP.stderr.on.mockImplementation((event: string, listener: (message: any, sendHandle: any) => void): Readable => {
        listeners[`stderr/${event}`] = listener;
        return mockedCP.stderr;
      });
      mockedCP.stdout = mock<Readable>();
      mockedCP.stdout.on.mockImplementation((event: string, listener: (message: any, sendHandle: any) => void): Readable => {
        listeners[`stdout/${event}`] = listener;
        return mockedCP.stdout;
      });
      mockSpawn.mockImplementationOnce((command: string, args: readonly string[], options: SpawnOptions): ChildProcess => {
        expect(command).toBe(bundledKubectlPath());
        return mockedCP;
      });
      mockWaitUntilUsed.mockReturnValueOnce(Promise.resolve());
      const cluster = new Cluster({ id: "foobar", kubeConfigPath: "fake-path.yml" });
      jest.spyOn(cluster, "apiUrl", "get").mockReturnValue("https://fake.k8s.internal");
      proxy = new KubeAuthProxy(cluster, port, {});
    });

    it("should call spawn and broadcast errors", async () => {
      await proxy.run();
      listeners["error"]({ message: "foobarbat" });

      expect(mockBroadcastIpc).toBeCalledWith("kube-auth:foobar", { data: "foobarbat", error: true });
    });

    it("should call spawn and broadcast exit", async () => {
      await proxy.run();
      listeners["exit"](0);

      expect(mockBroadcastIpc).toBeCalledWith("kube-auth:foobar", { data: "proxy exited with code: 0", error: false });
    });

    it("should call spawn and broadcast errors from stderr", async () => {
      await proxy.run();
      listeners["stderr/data"]("an error");

      expect(mockBroadcastIpc).toBeCalledWith("kube-auth:foobar", { data: "an error", error: true });
    });

    it("should call spawn and broadcast stdout serving info", async () => {
      await proxy.run();
      listeners["stdout/data"]("Starting to serve on");

      expect(mockBroadcastIpc).toBeCalledWith("kube-auth:foobar", { data: "Authentication proxy started\n" });
    });

    it("should call spawn and broadcast stdout other info", async () => {
      await proxy.run();
      listeners["stdout/data"]("some info");

      expect(mockBroadcastIpc).toBeCalledWith("kube-auth:foobar", { data: "some info" });
    });
  });
});