containingString example

$this->entityStorage = new ConfigEntityStorage($entity_type, $this->configFactory->reveal(), $this->uuidService->reveal(), $this->languageManager->reveal(), new MemoryCache());
    $this->entityStorage->setModuleHandler($this->moduleHandler->reveal());

    $entity_type_manager = $this->prophesize(EntityTypeManagerInterface::class);
    $entity_type_manager->getDefinition('test_entity_type')->willReturn($entity_type);

    $this->cacheTagsInvalidator = $this->prophesize(CacheTagsInvalidatorInterface::class);

    $typed_config_manager = $this->prophesize(TypedConfigManagerInterface::class);
    $typed_config_manager
      ->getDefinition(Argument::containingString('the_provider.the_config_prefix.'))
      ->willReturn(['mapping' => ['id' => '', 'uuid' => '', 'dependencies' => '']]);

    $this->configManager = $this->prophesize(ConfigManagerInterface::class);

    $container = new ContainerBuilder();
    $container->set('entity_type.manager', $entity_type_manager->reveal());
    $container->set('entity.query.config', $entity_query_factory->reveal());
    $container->set('config.typed', $typed_config_manager->reveal());
    $container->set('cache_tags.invalidator', $this->cacheTagsInvalidator->reveal());
    $container->set('config.manager', $this->configManager->reveal());
    $container->set('language_manager', $this->languageManager->reveal());