Test generators private methods

[makbol]

Say I wrote my custom generator like this

class extends Generator {
  writing() {
    this._private_method();
  }

  _private_method() {
    console.log('private hey');
  }
}

with use of private methods according to doc recommendation

I'd like to unit test only _private_method()

I tried to setup test like:

const Generator = require('../generators/app');
const generator = new Generator();

describe('generator:_private_method', () => {
  it('returns correct output', () => {
    assert(generator._private_method());
  });
});

but I get error TypeError: Cannot use 'in' operator to search for 'help' in undefined

[SBoudrias]

The Generator class expect arguments to be passed in. It requires an instance of yeoman-environment to work properly.

Something like const generator = environment.createEnv().instantiate(Generator).

This isn't really a public interface, so you might need to dig through the environment code to get it to work properly.

[makbol]

Thank you @SBoudrias 🙏