danger-plugin-code-lint/dist/index.test.js

A dangerjs plugin to lint js & stylesheets

const eslint = require('eslint');
const stylelint = require('stylelint');
global.danger = {
  git: {
    created_files: ['file1.js', 'file2.css', 'file3.scss', 'file4.js'],
    modified_files: ['file5.js', 'file6.css', 'file7.scss']
  },
  fail: jest.fn()
};
jest.mock('eslint', () => ({
  CLIEngine: jest.fn().mockImplementation(() => ({
    executeOnFiles: jest.fn().mockReturnValue({
      errorCount: 0,
      results: []
    }),
    getFormatter: jest.fn().mockReturnValue(() => 'ESLint formatter output')
  }))
}));
jest.mock('stylelint', () => ({
  lint: jest.fn().mockResolvedValue({
    errored: false,
    output: 'Stylelint output'
  })
}));

// Import the function to be tested
const {
  codeLint
} = require('./index');
describe('codeLint', () => {
  afterEach(() => {
    jest.clearAllMocks();
  });
  it('should lint JavaScript files when options.js is true', async () => {
    const options = {
      js: true,
      css: false,
      scss: false
    };
    await codeLint(options);
    expect(eslint.CLIEngine).toHaveBeenCalledTimes(1);
    expect(eslint.CLIEngine).toHaveBeenCalledWith();
    expect(eslint.CLIEngine().executeOnFiles).toHaveBeenCalledTimes(2);
    expect(eslint.CLIEngine().executeOnFiles).toHaveBeenCalledWith(['file1.js']);
    expect(eslint.CLIEngine().executeOnFiles).toHaveBeenCalledWith(['file4.js']);
    expect(eslint.CLIEngine().getFormatter).toHaveBeenCalledTimes(2);
    expect(eslint.CLIEngine().getFormatter).toHaveBeenCalledWith();
    expect(fail).not.toHaveBeenCalled();
    expect(consoleLog).toHaveBeenCalledTimes(2);
    expect(consoleLog).toHaveBeenCalledWith('ESLint formatter output');
  });
  it('should lint CSS and SCSS files when options.css or options.scss is true', async () => {
    const options = {
      js: false,
      css: true,
      scss: true
    };
    await codeLint(options);
    expect(stylelint.lint).toHaveBeenCalledTimes(2);
    expect(stylelint.lint).toHaveBeenCalledWith({
      files: 'file2.css'
    });
    expect(stylelint.lint).toHaveBeenCalledWith({
      files: 'file3.scss'
    });
    expect(fail).not.toHaveBeenCalled();
    expect(consoleLog).toHaveBeenCalledTimes(2);
    expect(consoleLog).toHaveBeenCalledWith('Stylelint output');
  });
  it('should not lint any files when options.js, options.css, and options.scss are all false', async () => {
    const options = {
      js: false,
      css: false,
      scss: false
    };
    await codeLint(options);
    expect(eslint.CLIEngine).not.toHaveBeenCalled();
    expect(stylelint.lint).not.toHaveBeenCalled();
    expect(fail).not.toHaveBeenCalled();
    expect(consoleLog).not.toHaveBeenCalled();
  });
});