Install

npm install yeoman-test

yarn add yeoman-test

yeoman-test

Test utilities for Yeoman generators

Installation

 $ npm install --save-dev yeoman-test

Install target environment and generator:

 $ npm install --save-dev yeoman-generator@xxx yeoman-environment@xxx

Usage

Usage:

 import helpers from 'yeoman-test';

describe('generator test', () => {
  describe('test', () => {
    let runResult;
    beforeEach(async () => {
      runResult = await helpers
        .create(                   // instantiates RunContext
          'namespace',             // namespace or generator
          {},                      // test options
          {}                       // environment options
        )
        [.cd(dir)]                  // runs the test inside a non temporary dir
        [.onTargetDirectory(dir => {})        // prepares the test dir
        [.withGenerators([])]       // registers additional generators
        [.withLookups({})]          // runs Environment lookups
        [.withOptions({})]          // passes options to the generator
        [.withLocalConfig({})]      // sets the generator config as soon as it is instantiated
        [.withAnswers()]            // simulates the prompt answers
        [.withMockedGenerators(['namespace', ...])]      // adds a mocked generator to the namespaces
        [.withFiles({
          'foo.txt': 'bar',
          'test.json', { content: true },
        })]                         // add files to mem-fs
        [.withYoRc({ 'generator-foo': { bar: {} } })]    // add config to .yo-rc.json
        [.withYoRcConfig('generator-foo.bar', { : {} })] // same as above
        [.commitFiles()]            // commit mem-fs files to disk
        [.onGenerator(gen => {})]   // do something with the generator
        [.onEnvironment(env => {})] // do something with the environment
        [.build(runContext => {     // instantiates Environment/Generator
          [runContext.env...]       // does something with the environment
          [runContext.generator...] // does something with the generator
        })]
        .run();                     // runs the environment, promises a RunResult
      [result.create().run()] // instantiates a new RunContext at the same directory
    );
    afterEach(() => {
      if (runResult) {
        // Optional if context is executed at a temporary folder
        runResult.restore();
      }
    });
    it('runs correctly', () => {
      // runs assertions using mem-fs.
      [runResult.assertFile('file.txt');]
      [runResult.assertNoFile('file.txt');]
      [runResult.assertFileContent('file.txt', 'content');]
      [runResult.assertEqualsFileContent('file.txt', 'content');]
      [runResult.assertNoFileContent('file.txt', 'content');]
      [runResult.assertJsonFileContent('file.txt', {});]
      [runResult.assertNoJsonFileContent('file.txt', {});]
    });
  });
});

Convenience last RunResult instance:

 import helpers, { result } from 'yeoman-test';

describe('generator test', () => {
  before(() => helpers.run('namespace'));
  it('test', () => {
    result.assert...;
  });
});

Generator compose:

 import assert from 'assert';
import helpers, { result } from 'yeoman-test';

describe('my-gen', () => {
  before(() => helpers.run('my-gen').withMockedGenerator(['composed-gen']));
  it('should compose with composed-gen', () => {
    assert(result.mockedGenerators['composed-gen'].calledOnce);
  });
});

Generic test folder:

 import helpers, { result } from 'yeoman-test';

describe('generic test', () => {
  before(() => helpers.prepareTemporaryDir());
  it('test', () => {
    result.assert...;
  });
});