Gazebo_simulation-Frontend/node_modules/@testing-library/user-event

user-event

Simulate user events for react-testing-library.

---

The problem

From testing-library/dom-testing-library#107:

[...] it is becoming apparent the need to express user actions on a web page using a higher-level abstraction than fireEvent

The solution

user-event tries to simulate the real events that would happen in the browser as the user interacts with it. For example userEvent.click(checkbox) would change the state of the checkbox.

The library is still a work in progress and any help is appreciated.

Installation

With NPM:

npm install @testing-library/user-event --save-dev

With Yarn:

yarn add @testing-library/user-event --dev

Now simply import it in your tests:

import userEvent from "@testing-library/user-event";

// or

var userEvent = require("@testing-library/user-event");

API

click(element)

Clicks element, depending on what element is it can have different side effects.

import React from "react";
import { render } from "@testing-library/react";
import userEvent from "@testing-library/user-event";

test("click", () => {
  const { getByText, getByTestId } = render(
    <div>
      <label htmlFor="checkbox">Check</label>
      <input id="checkbox" data-testid="checkbox" type="checkbox" />
    </div>
  );

  userEvent.click(getByText("Check"));
  expect(getByTestId("checkbox")).toHaveAttribute("checked", true);
});

dblClick(element)

Clicks element twice, depending on what element is it can have different side effects.

import React from "react";
import { render } from "@testing-library/react";
import userEvent from "@testing-library/user-event";

test("double click", () => {
  const onChange = jest.fn();
  const { getByTestId } = render(
    <input type="checkbox" id="checkbox" onChange={onChange} />
  );
  const checkbox = getByTestId("checkbox");
  userEvent.dblClick(checkbox);
  expect(onChange).toHaveBeenCalledTimes(2);
  expect(checkbox).toHaveProperty("checked", false);
});

type(element, text, [options])

Writes text inside an <input> or a <textarea>.

import React from "react";
import { render } from "@testing-library/react";
import userEvent from "@testing-library/user-event";

const { getByTestId } = test("click", () => {
  render(<textarea data-testid="email" />);
});

userEvent.type(getByTestId("email"), "Hello, World!");
expect(getByTestId("email")).toHaveAttribute("value", "Hello, World!");

If options.allAtOnce is true, type will write text at once rather than one character at the time. false is the default value.

options.delay is the number of milliseconds that pass between two characters are typed. By default it's 0. You can use this option if your component has a different behavior for fast or slow users.

selectOptions(element, values)

Selects the specified option(s) of a <select> or a <select multiple> element.

import React from "react";
import { render } from "@testing-library/react";
import userEvent from "@testing-library/user-event";

const { getByTestId } = render(
  <select multiple data-testid="select-multiple">
    <option data-testid="val1" value="1">
      1
    </option>
    <option data-testid="val2" value="2">
      2
    </option>
    <option data-testid="val3" value="3">
      3
    </option>
  </select>
);

userEvent.selectOptions(getByTestId("select-multiple"), ["1", "3"]);

expect(getByTestId("val1").selected).toBe(true);
expect(getByTestId("val2").selected).toBe(false);
expect(getByTestId("val3").selected).toBe(true);

The values parameter can be either an array of values or a singular scalar value.

Contributors

Thanks goes to these wonderful people (emoji key):

Giorgio Polvara 🐛 💻 📖 🤔 🚇 👀 ⚠️	Weyert de Boer 💻 ⚠️	Tim Whitbeck 🐛 💻	Michaël De Boey 📖	Michael Lasky 💻 📖 🤔	Ahmad Esmaeilzadeh 📖	Caleb Eby 💻 🐛
Adrià Fontcuberta 🐛 ⚠️ 💻	Sky Wickenden 🐛 💻	Bodnar Bogdan 🐛 💻	Zach Perrault 📖	Ryan Stelly 📖	Ben Monro 💻

This project follows the all-contributors specification. Contributions of any kind welcome!