ItemList example

->onlyMethods(['get'])
      ->getMock();
    $container->expects($this->any())
      ->method('get')
      ->with($this->equalTo('typed_data_manager'))
      ->willReturn($typed_data_manager);

    \Drupal::setContainer($container);

    $this->normalizer = new ListNormalizer();

    $this->list = new ItemList(new DataDefinition());
    $this->list->setValue($this->expectedListValues);
  }

  /** * Tests the supportsNormalization() method. */
  public function testSupportsNormalization() {
    $this->assertTrue($this->normalizer->supportsNormalization($this->list));
    $this->assertFalse($this->normalizer->supportsNormalization(new \stdClass()));
  }