Core htmx API test

• triggers properly w/ selector2ms ‣

  var div = make("<div id='div1'/>")
  var myEventCalled = false
  var detailStr = ''
  htmx.on('myEvent', function(evt) {
    myEventCalled = true
    detailStr = evt.detail.str
  })
  htmx.trigger('#div1', 'myEvent', { str: 'foo' })
  myEventCalled.should.equal(true)
  detailStr.should.equal('foo')