class BlockHiddenRegionTest

class BlockHiddenRegionTest extends BrowserTestBase {
    
    /**
     * An administrative user to configure the test environment.
     */
    protected $adminUser;
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'block',
        'block_test',
        'search',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        // Create administrative user.
        $this->adminUser = $this->drupalCreateUser([
            'administer blocks',
            'administer themes',
            'search content',
        ]);
        $this->drupalLogin($this->adminUser);
        $this->drupalPlaceBlock('search_form_block');
        $this->drupalPlaceBlock('local_tasks_block');
    }
    
    /**
     * Tests that hidden regions do not inherit blocks when a theme is installed.
     */
    public function testBlockNotInHiddenRegion() {
        // Ensure that the search form block is displayed.
        $this->drupalGet('');
        $this->assertSession()
            ->pageTextContains('Search');
        // Install "block_test_theme" and set it as the default theme.
        $theme = 'block_test_theme';
        // We need to install a non-hidden theme so that there is more than one
        // local task.
        \Drupal::service('theme_installer')->install([
            $theme,
            'stark',
        ]);
        $this->config('system.theme')
            ->set('default', $theme)
            ->save();
        // Installing a theme will cause the kernel terminate event to rebuild the
        // router. Simulate that here.
        \Drupal::service('router.builder')->rebuildIfNeeded();
        // Ensure that "block_test_theme" is set as the default theme.
        $this->drupalGet('admin/structure/block');
        $this->assertSession()
            ->pageTextContains('Block test theme(active tab)');
        // Ensure that the search form block is displayed.
        $this->drupalGet('');
        $this->assertSession()
            ->pageTextContains('Search');
    }

}