type.js

import React from "react";
import { cleanup, render, wait, fireEvent } from "@testing-library/react";
import "@testing-library/jest-dom/extend-expect";
import userEvent from "../../src";

afterEach(cleanup);

describe("userEvent.type", () => {
  it.each(["input", "textarea"])("should type text in <%s>", type => {
    const onChange = jest.fn();
    const { getByTestId } = render(
      React.createElement(type, {
        "data-testid": "input",
        onChange: onChange
      })
    );
    const text = "Hello, world!";
    userEvent.type(getByTestId("input"), text);
    expect(onChange).toHaveBeenCalledTimes(text.length);
    expect(getByTestId("input")).toHaveProperty("value", text);
  });

  it("should not type when event.preventDefault() is called", () => {
    const onChange = jest.fn();
    const onKeydown = jest
      .fn()
      .mockImplementation(event => event.preventDefault());
    const { getByTestId } = render(
      <input data-testid="input" onKeyDown={onKeydown} onChange={onChange} />
    );
    const text = "Hello, world!";
    userEvent.type(getByTestId("input"), text);
    expect(onKeydown).toHaveBeenCalledTimes(text.length);
    expect(onChange).toHaveBeenCalledTimes(0);
    expect(getByTestId("input")).not.toHaveProperty("value", text);
  });

  it.each(["input", "textarea"])(
    "should not type when <%s> is disabled",
    type => {
      const onChange = jest.fn();
      const { getByTestId } = render(
        React.createElement(type, {
          "data-testid": "input",
          onChange: onChange,
          disabled: true
        })
      );
      const text = "Hello, world!";
      userEvent.type(getByTestId("input"), text);
      expect(onChange).not.toHaveBeenCalled();
      expect(getByTestId("input")).toHaveProperty("value", "");
    }
  );

  it.each(["input", "textarea"])(
    "should not type when <%s> is readOnly",
    type => {
      const onChange = jest.fn();
      const onKeyDown = jest.fn();
      const onKeyPress = jest.fn();
      const onKeyUp = jest.fn();
      const { getByTestId } = render(
        React.createElement(type, {
          "data-testid": "input",
          onChange,
          onKeyDown,
          onKeyPress,
          onKeyUp,
          readOnly: true
        })
      );
      const text = "Hello, world!";
      userEvent.type(getByTestId("input"), text);
      expect(onKeyDown).toHaveBeenCalledTimes(text.length);
      expect(onKeyPress).toHaveBeenCalledTimes(text.length);
      expect(onKeyUp).toHaveBeenCalledTimes(text.length);
      expect(onChange).not.toHaveBeenCalled();
      expect(getByTestId("input")).toHaveProperty("value", "");
    }
  );

  it("should delay the typing when opts.delay is not 0", async () => {
    jest.useFakeTimers();
    const onChange = jest.fn();
    const onInput = jest.fn();
    const { getByTestId } = render(
      React.createElement("input", {
        "data-testid": "input",
        onInput,
        onChange
      })
    );
    const text = "Hello, world!";
    const delay = 10;
    // Attach a native change listener because React cannot listen for text input change events
    userEvent.type(getByTestId("input"), text, {
      delay
    });
    expect(onInput).not.toHaveBeenCalled();
    expect(getByTestId("input")).not.toHaveProperty("value", text);

    for (let i = 0; i < text.length; i++) {
      jest.advanceTimersByTime(delay);
      await wait(() => expect(onInput).toHaveBeenCalledTimes(i + 1));
      expect(onChange).toHaveBeenCalledTimes(i + 1);
      expect(getByTestId("input")).toHaveProperty(
        "value",
        text.slice(0, i + 1)
      );
    }
    // Blurring the input "commits" the value, React's onChange should not fire
    fireEvent.blur(getByTestId("input"));
    await wait(() => expect(onChange).toHaveBeenCalledTimes(text.length), {
      timeout: 300
    });
  });

  it.each(["input", "textarea"])(
    "should type text in <%s> all at once",
    type => {
      const onChange = jest.fn();
      const { getByTestId } = render(
        React.createElement(type, {
          "data-testid": "input",
          onChange: onChange
        })
      );
      const text = "Hello, world!";
      userEvent.type(getByTestId("input"), text, {
        allAtOnce: true
      });

      expect(onChange).toHaveBeenCalledTimes(1);
      expect(getByTestId("input")).toHaveProperty("value", text);
    }
  );

  it.each(["input", "textarea"])(
    "should type text in <%s> up to maxLength if provided",
    type => {
      const onChange = jest.fn();
      const onKeyDown = jest.fn();
      const onKeyPress = jest.fn();
      const onKeyUp = jest.fn();
      const maxLength = 10;

      const { getByTestId } = render(
        React.createElement(type, {
          "data-testid": "input",
          onChange,
          onKeyDown,
          onKeyPress,
          onKeyUp,
          maxLength
        })
      );

      const text = "superlongtext";
      const slicedText = text.slice(0, maxLength);

      const inputEl = getByTestId("input");

      userEvent.type(inputEl, text);

      expect(inputEl).toHaveProperty("value", slicedText);
      expect(onChange).toHaveBeenCalledTimes(slicedText.length);
      expect(onKeyPress).toHaveBeenCalledTimes(text.length);
      expect(onKeyDown).toHaveBeenCalledTimes(text.length);
      expect(onKeyUp).toHaveBeenCalledTimes(text.length);

      inputEl.value = "";
      onChange.mockClear();
      onKeyPress.mockClear();
      onKeyDown.mockClear();
      onKeyUp.mockClear();

      userEvent.type(inputEl, text, {
        allAtOnce: true
      });

      expect(inputEl).toHaveProperty("value", slicedText);
      expect(onChange).toHaveBeenCalledTimes(1);
      expect(onKeyPress).not.toHaveBeenCalled();
      expect(onKeyDown).not.toHaveBeenCalled();
      expect(onKeyUp).not.toHaveBeenCalled();
    }
  );
});