public function testInvalidForm()
{
$inputValues = array('firstname' => '', 'lastname' => '', 'email' => 'testexample.com', 'admin' => '');
$this->form->setDefinedWritableValues($inputValues);
$this->form->validate();
$this->assertTrue($this->form->hasErrors());
$this->assertCount(3, $this->form->getErrors());
}