list = new DataList(Team::class); $config = GridFieldConfig_RecordEditor::create()->addComponent(new GridFieldFilterHeader()); $this->gridField = new GridField('testfield', 'testfield', $this->list, $config); $this->form = new Form(null, 'Form', new FieldList([$this->gridField]), new FieldList()); $this->component = $this->gridField->getConfig()->getComponentByType(GridFieldFilterHeader::class); } /** * Tests that the appropriate filter headers are generated * * @skipUpgrade */ public function testRenderHeaders() { $htmlFragment = $this->component->getHTMLFragments($this->gridField); // Check that the output is the new search field $this->assertStringContainsString('