FieldItemList example

->willReturn(TRUE);

    $field_storage_definition = $this->createMock('Drupal\Core\Field\FieldStorageDefinitionInterface');
    $field_storage_definition->expects($this->any())
      ->method('getPropertyDefinitions')
      ->willReturn($property_definitions);
    $field_definition = $this->createMock('Drupal\Core\Field\FieldDefinitionInterface');
    $field_definition->expects($this->any())
      ->method('getFieldStorageDefinition')
      ->willReturn($field_storage_definition);

    $field_list_a = new FieldItemList($field_definition);
    $field_list_b = new FieldItemList($field_definition);

    // Set up the mocking necessary for creating field items.     $field_type_manager->expects($this->any())
      ->method('createFieldItem')
      ->willReturnOnConsecutiveCalls($first_field_item, $second_field_item);

    // Set the field item values.     if ($first_field_item instanceof FieldItemInterface) {
      $field_list_a->setValue($first_field_item);
    }
    

$linkItem->expects($this->any())
      ->method('getParent')
      ->willReturn($entity);
    $linkItem->expects($this->once())
      ->method('getUrl')
      ->willThrowException($exception);
    $linkItem->expects($this->any())
      ->method('__get')
      ->with('options')
      ->willReturn([]);
    $fieldDefinition = $this->createMock(FieldDefinitionInterface::class);
    $fieldList = new FieldItemList($fieldDefinition, '', $linkItem);

    $fieldTypePluginManager = $this->createMock(FieldTypePluginManagerInterface::class);
    $fieldTypePluginManager->expects($this->once())
      ->method('createFieldItem')
      ->will($this->returnValue($linkItem));
    $urlGenerator = $this->createMock(UrlGenerator::class);
    $urlGenerator->expects($this->once())
      ->method('generateFromRoute')
      ->with('<none>', [], [], FALSE)
      ->willReturn('http://example.com');
    $container = new ContainerBuilder();