authelia/test/features/step_definitions/restrictions.ts

import Cucumber = require("cucumber");
import seleniumWebdriver = require("selenium-webdriver");
import Assert = require("assert");

Cucumber.defineSupportCode(function ({ Given, When, Then }) {
  Then("I get an error {number}", function (code: number) {
    return this.driver
      .findElement(seleniumWebdriver.By.tagName("h1"))
      .findElement(seleniumWebdriver.By.xpath("//h1[contains(.,'Error " + code + "')]"));
  });
});