configure([
            'preferences' => [
                \Magento\Cms\Model\Page\CustomLayoutManagerInterface::class =>
                    \Magento\TestFramework\Cms\Model\CustomLayoutManager::class
            ]
        ]);
        $objectManager = Bootstrap::getObjectManager();
        $this->repo = $objectManager->get(PageRepositoryInterface::class);
        $this->retriever = $objectManager->get(GetPageByIdentifierInterface::class);
    }
    /**
     * Test that the field is deprecated.
     *
     * @throws \Throwable
     * @magentoDataFixture Magento/Cms/_files/pages_with_layout_xml.php
     * @return void
     */
    public function testSaveUpdateXml(): void
    {
        $page = $this->retriever->execute('test_custom_layout_page_1', 0);
        $page->setTitle($page->getTitle() . 'TEST');
        //Is successfully saved without changes to the custom layout xml.
        $page = $this->repo->save($page);
        //New value is not accepted.
        $page->setCustomLayoutUpdateXml('');
        $forbidden = false;
        try {
            $page = $this->repo->save($page);
        } catch (CouldNotSaveException $exception) {
            $forbidden = true;
        }
        $this->assertTrue($forbidden);
        //New value is not accepted.
        $page->setLayoutUpdateXml('');
        $forbidden = false;
        try {
            $page = $this->repo->save($page);
        } catch (CouldNotSaveException $exception) {
            $forbidden = true;
        }
        $this->assertTrue($forbidden);
        //Can be removed
        $page->setCustomLayoutUpdateXml(null);
        $page->setLayoutUpdateXml(null);
        $page = $this->repo->save($page);
        $this->assertEmpty($page->getCustomLayoutUpdateXml());
        $this->assertEmpty($page->getLayoutUpdateXml());
    }
    /**
     * Verifies that cms page with identifier which duplicates existed route shouldn't be saved
     *
     * @return void
     * @throws \Throwable
     * @magentoDataFixture Magento/Cms/_files/pages.php
     */
    public function testSaveWithRouteDuplicate(): void
    {
        $page = $this->retriever->execute('page100', 0);
        $page->setIdentifier('customer');
        $this->expectException(CouldNotSaveException::class);
        $this->repo->save($page);
    }
}