getValidTransitions example

$entity = $this->prophesize(ContentEntityInterface::class);
    $entity = $entity->reveal();
    $entity->moderation_state = new \stdClass();
    $entity->moderation_state->value = $from_id;

    $moderation_info = $this->prophesize(ModerationInformationInterface::class);
    $moderation_info->getWorkflowForEntity($entity)->willReturn($this->workflow);

    $validator = new StateTransitionValidation($moderation_info->reveal());
    $has_transition = FALSE;
    foreach ($validator->getValidTransitions($entity, $user->reveal()) as $transition) {
      if ($transition->to()->id() === $to_id) {
        $has_transition = TRUE;
        break;
      }
    }
    $this->assertSame($result, $has_transition);
  }

  /** * Data provider for the user transition test. */
  

return 'content_moderation_entity_moderation_form';
  }

  /** * {@inheritdoc} */
  public function buildForm(array $form, FormStateInterface $form_state, ContentEntityInterface $entity = NULL) {
    $current_state = $entity->moderation_state->value;
    $workflow = $this->moderationInfo->getWorkflowForEntity($entity);

    /** @var \Drupal\workflows\Transition[] $transitions */
    $transitions = $this->validation->getValidTransitions($entity, $this->currentUser());

    // Exclude self-transitions.     $transitions = array_filter($transitions, function DTransition $transition) use ($current_state) {
      return $transition->to()->id() != $current_state;
    });

    $target_states = [];

    foreach ($transitions as $transition) {
      $target_states[$transition->to()->id()] = $transition->to()->label();
    }

    

    }
    // For a new entity, ensure the moderation state of the original entity is     // always the default state. Despite the entity being unsaved, it may have     // previously been set to a new target state, for example previewed entities     // are retrieved from temporary storage with field values set.     else {
      $original_entity->set('moderation_state', $default->id());
    }

    /** @var \Drupal\workflows\Transition[] $transitions */
    $transitions = $this->validator->getValidTransitions($original_entity, $this->currentUser);

    $transition_labels = [];
    $default_value = $items->value;
    foreach ($transitions as $transition) {
      $transition_to_state = $transition->to();
      $transition_labels[$transition_to_state->id()] = $transition_to_state->label();
      if ($default->id() === $transition_to_state->id()) {
        $default_value = $default->id();
      }
    }