Testing when exceptions are thrown in 1.0.x

[chrishutchinson]

In my generator code I'm throwing an exception if a property of opts is not present, but I'm struggling to catch and test that error in my unit tests.

Any advice / suggestions would be great!

Generator:

module.exports = class extends Generator {

  constructor(args, opts) {
    super(args, opts);

    if(typeof opts.props === 'undefined') {
      throw new Error('The error message I want to assert on');
    }

    // ...
}

Test:

describe('abstracted error test', () => {

  it('throws an error', (done) => {
    helpers
      .run(generatorPath)
      .withOptions({
        props: undefined // The thing I'm expecting to find, when undefined it should error
      })
      .on('error', (e) => {
        // I'd expect to be able to make an assertion on the error here
        done();
      })
  });

});

yeoman-generator: 1.0.1
yeoman-assert: 2.2.2
yeoman-test: 1.6.0
mocha: 3.2.0

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