Core htmx client side validation tests

• hx-validate can prevent a single input from submitting12ms ‣

  this.server.respondWith('POST', '/test', 'Clicked!')
  var div = make("<div id='d1'>No Request</div>")
  var form = make('<form><input type="text" hx-target="#d1" hx-post="/test" hx-trigger="click" id="i1" name="i1" pattern="[0-9]+" hx-validate="true"/></form>')
  var input = byId('i1')
  div.textContent.should.equal('No Request')
  input.value = 'abc'
  input.click()
  this.server.respond()
  div.textContent.should.equal('No Request')
  input.value = '1bc'
  input.click()
  this.server.respond()
  div.textContent.should.equal('No Request')
  input.value = '123'
  input.click()
  this.server.respond()
  div.textContent.should.equal('Clicked!')