Core htmx AJAX Tests

• properly handles clicked submit input with a value stacking with regular input9ms ‣

  var values
  this.server.respondWith('Post', '/test', function(xhr) {
    values = getParameters(xhr)
    xhr.respond(204, {}, '')
  })
  make('<form hx-post="/test">' +
          '<input type="hidden" name="action" value="A">' +
          '<input id="btnA" type="submit">A</input>' +
          '<input id="btnB" type="submit" name="action" value="B">B</input>' +
          '<input id="btnC" type="submit" name="action" value="C">C</input>' +
          '</form>')
  byId('btnA').click()
  this.server.respond()
  values.should.deep.equal({ action: 'A' })
  byId('btnB').click()
  this.server.respond()
  values.should.deep.equal({ action: ['A', 'B'] })
  byId('btnC').click()
  this.server.respond()
  values.should.deep.equal({ action: ['A', 'C'] })