Issue #3135968 by Berdir: Fixing new/remaining Drupal 9 test fails

    // Does not do a redirect, stays in the same path.

    $this->assertSame(200, $response->getStatusCode());

    $this->assertEmpty($response->getHeader('Location'));

    $this->assertNotContains('http-equiv="refresh', (string) $response->getBody());

    $this->assertStringNotContainsString('http-equiv="refresh', (string) $response->getBody());

    // Test the access checking.

    $this->config->set('access_check', TRUE)->save();