```js
beforeEach(function() {
  this.logStub = this.sinon.stub(Backbone.Radio, 'log');
  this.channel.command(this.commandName, 'foo', 'bar');
});

it('should call Radio.log with the correct arguments', function() {
  expect(this.logStub).to.have.been.calledWith(this.channelName);
});
```