/**
* Tests that the appropriate sortable headers are generated
*/
public function testRenderHeaders()
{
// Generate sortable header and extract HTML
$list = new DataList('GridFieldSortableHeaderTest_Team');
$config = new GridFieldConfig_RecordEditor();
/** @skipUpgrade */
$form = new Form(Controller::curr(), 'Form', new FieldList(), new FieldList());
$gridField = new GridField('testfield', 'testfield', $list, $config);
$gridField->setForm($form);
$compontent = $gridField->getConfig()->getComponentByType('SilverStripe\\Forms\\GridField\\GridFieldSortableHeader');
$htmlFragment = $compontent->getHTMLFragments($gridField);
// Check that the output shows name and hat as sortable fields, but not city
$this->assertContains('<span class="non-sortable">City</span>', $htmlFragment['header']);
$this->assertContains('value="Name" class="action grid-field__sort" id="action_SetOrderName"', $htmlFragment['header']);
$this->assertContains('value="Cheerleader Hat" class="action grid-field__sort" id="action_SetOrderCheerleader-Hat-Colour"', $htmlFragment['header']);
// Check inverse of above
$this->assertNotContains('value="City" class="action grid-field__sort" id="action_SetOrderCity"', $htmlFragment['header']);
$this->assertNotContains('<span class="non-sortable">Name</span>', $htmlFragment['header']);
$this->assertNotContains('<span class="non-sortable">Cheerleader Hat</span>', $htmlFragment['header']);
}