error.test.js

const chalk = require('chalk');
const commander = require('commander');
const path = require('path');
const execSync = require('child_process').execSync;
const packageJson = require('./package.json');

const originalConsoleLog = console.log;
console.log = jest.fn();

const originalConsoleError = console.error;
console.error = jest.fn();

jest.mock('child_process', () => {
  const execSync = jest.fn();

  return { execSync };
});

jest.mock('chalk', () => {
  const red = jest.fn(text => text);
  const cyan = jest.fn(text => text);
  const green = jest.fn(text => text);
  const magenta = jest.fn(text => text);

  return {
    red,
    cyan,
    green,
    magenta,
  };
});

describe('cli shows error', () => {
  it('cli runs without arguments', () => {
    const originalProcessExit = process.exit;
    process.exit = jest.fn();
    process.argv[2] = '';
    require('./cli');


    expect(console.error.mock.calls).toEqual([['In order to create a new project you must give a name as an argument. ', 'Example: create-react-once-app AppName']]);
    expect(process.exit.mock.calls).toEqual([[1]]);
    process.exit = originalProcessExit;
  });
});