public function test_get_item_post_request() {
    wp_set_current_user( self::$user_id );
    $string_attribute = 'Lorem ipsum dolor';
    $attributes       = array( 'some_string' => $string_attribute );
    $request          = new WP_REST_Request( 'POST', self::$rest_api_route . self::$block_name );
    $request->set_param( 'context', 'edit' );
    $request->set_header( 'content-type', 'application/json' );
    $request->set_body( wp_json_encode( compact( 'attributes' ) ) );
    $response = rest_get_server()->dispatch( $request );

    $this->assertSame( 200, $response->get_status() );
    $this->assertStringContainsString( $string_attribute, $response->get_data()['rendered'] );
  }