public function testRemoveManyExtraClasses()
{
$field = new FormField('MyField');
$field->addExtraClass('class1 class2 class3 class4 class5');
//test we can remove a single class we just added
$field->removeExtraClass('class3');
$this->assertStringEndsWith('class1 class2 class4 class5', $field->extraClass());
//check we can remove many classes at once
$field->removeExtraClass('class1 class5');
$this->assertStringEndsWith('class2 class4', $field->extraClass());
//check that removing a dud class is fine
$field->removeExtraClass('dudClass');
$this->assertStringEndsWith('class2 class4', $field->extraClass());
}
