info-command.test.js

"use strict";

jest.mock("envinfo");

const path = require("path");
const envinfo = require("envinfo");

envinfo.run.mockResolvedValue("MOCK_ENVINFO");

// helper
const output = require("@lerna/output");

// file under test
const lernaInfo = require("@lerna-test/command-runner")(require("../command"));

it("outputs result of envinfo()", async () => {
  // project fixture is irrelevant, no actual changes are made
  await lernaInfo(path.resolve(__dirname, "../../.."))();

  expect(envinfo.run).toHaveBeenLastCalledWith(
    expect.objectContaining({
      npmPackages: ["lerna"],
    })
  );
  expect(output.logged()).toMatch("MOCK_ENVINFO");
});