Issue #3463547 by catch: Use API methods instead of form submissions in...

   */

  protected function setUp(): void {

    parent::setUp();

    $this->drupalPlaceBlock('page_title_block');

    $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);

    // Create a user who can administer text formats, but does not have

    // Create three text formats. Two text formats are created for all users so

    // that the drop-down list appears for all tests.

    $this->drupalLogin($this->filterAdminUser);

    $formats = [];

    for ($i = 0; $i < 3; $i++) {

      $edit = [

      $format = FilterFormat::create([

        'format' => $this->randomMachineName(),

        'name' => $this->randomMachineName(),

      ];

      $this->drupalGet('admin/config/content/formats/add');

      $this->submitForm($edit, 'Save configuration');

      $this->resetFilterCaches();

      $formats[] = FilterFormat::load($edit['format']);

      ]);

      $format->save();

      $formats[] = $format;

    }

    [$this->allowedFormat, $this->secondAllowedFormat, $this->disallowedFormat] = $formats;

    $this->drupalLogout();

    // Create a regular user with access to two of the formats.

    $this->webUser = $this->drupalCreateUser([