fieldUIAddExistingFieldJS example

  public function testReuseExistingField() {
    $path = 'admin/structure/types/manage/article';
    $path2 = 'admin/structure/types/manage/page';
    $this->drupalGet($path2 . '/fields');
    // The button should not be visible without any re-usable fields.     $this->assertSession()->linkNotExists('Re-use an existing field');
    $field_label = 'Test field';
    // Create a field, and a node with some data for the field.     $this->fieldUIAddNewFieldJS($path, 'test', $field_label);
    // Add an existing field.     $this->fieldUIAddExistingFieldJS($path2, 'field_test', $field_label);
    // Confirm the button is no longer visible after re-using the field.     $this->assertSession()->linkNotExists('Re-use an existing field');
  }

  /** * Tests filter results in the re-use form. */
  public function testFilterInReuseForm() {
    $session = $this->getSession();
    $page = $session->getPage();
    $path = 'admin/structure/types/manage/article';