open-nomad/ui/tests/helpers/glimmer-factory.js

// Used in glimmer component unit tests. Glimmer components should typically
// be tested with integration tests, but occasionally individual methods or
// properties have logic that isn't coupled to rendering or the DOM and can
// be better tested in a unit fashion.
//
// Use like
//
// setupGlimmerComponentFactory(hooks, 'my-component')
//
// test('testing my component', function(assert) {
//   const component = this.createComponent({ hello: 'world' });
//   assert.equal(component.args.hello, 'world');
// });
export default function setupGlimmerComponentFactory(hooks, componentKey) {
  hooks.beforeEach(function() {
    this.createComponent = glimmerComponentInstantiator(this.owner, componentKey);
  });

  hooks.afterEach(function() {
    delete this.createComponent;
  });
}

// Look up the component class in the glimmer component manager and return a
// function to construct components as if they were functions.
function glimmerComponentInstantiator(owner, componentKey) {
  return (args = {}) => {
    const componentManager = owner.lookup('component-manager:glimmer');
    const componentClass = owner.factoryFor(`component:${componentKey}`).class;
    return componentManager.createComponent(componentClass, { named: args });
  };
}