react-native/Libraries/Components/TextInput/__tests__/TextInput-test.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails oncall+react_native
 * @format
 * @flow-strict
 */

const React = require('react');
const ReactTestRenderer = require('react-test-renderer');
const TextInput = require('../TextInput');
const ReactNative = require('../../../Renderer/shims/ReactNative');

const {
  enter,
  expectRendersMatchingSnapshot,
} = require('../../../Utilities/ReactNativeTestTools');

jest.unmock('../TextInput');

describe('TextInput tests', () => {
  let input;
  let inputRef;
  let onChangeListener;
  let onChangeTextListener;
  const initialValue = 'initialValue';
  beforeEach(() => {
    inputRef = React.createRef(null);
    onChangeListener = jest.fn();
    onChangeTextListener = jest.fn();
    function TextInputWrapper() {
      const [state, setState] = React.useState({text: initialValue});

      return (
        <TextInput
          ref={inputRef}
          value={state.text}
          onChangeText={text => {
            onChangeTextListener(text);
            setState({text});
          }}
          onChange={event => {
            onChangeListener(event);
          }}
        />
      );
    }
    const renderTree = ReactTestRenderer.create(<TextInputWrapper />);
    input = renderTree.root.findByType(TextInput);
  });
  it('has expected instance functions', () => {
    expect(inputRef.current.isFocused).toBeInstanceOf(Function); // Would have prevented S168585
    expect(inputRef.current.clear).toBeInstanceOf(Function);
    expect(inputRef.current.focus).toBeInstanceOf(jest.fn().constructor);
    expect(inputRef.current.blur).toBeInstanceOf(jest.fn().constructor);
    expect(inputRef.current.setNativeProps).toBeInstanceOf(
      jest.fn().constructor,
    );
    expect(inputRef.current.measure).toBeInstanceOf(jest.fn().constructor);
    expect(inputRef.current.measureInWindow).toBeInstanceOf(
      jest.fn().constructor,
    );
    expect(inputRef.current.measureLayout).toBeInstanceOf(
      jest.fn().constructor,
    );
  });
  it('calls onChange callbacks', () => {
    expect(input.props.value).toBe(initialValue);
    const message = 'This is a test message';
    ReactTestRenderer.act(() => {
      enter(input, message);
    });
    expect(input.props.value).toBe(message);
    expect(onChangeTextListener).toHaveBeenCalledWith(message);
    expect(onChangeListener).toHaveBeenCalledWith({
      nativeEvent: {text: message},
    });
  });

  function createTextInput(extraProps) {
    const textInputRef = React.createRef(null);
    ReactTestRenderer.create(
      <TextInput ref={textInputRef} value="value1" {...extraProps} />,
    );
    return textInputRef;
  }

  it('focus() should not do anything if the TextInput is not editable', () => {
    const textInputRef = createTextInput({editable: false});
    // currentProps is the property actually containing props at runtime
    textInputRef.current.currentProps = textInputRef.current.props;
    expect(textInputRef.current.isFocused()).toBe(false);

    TextInput.State.focusTextInput(textInputRef.current);
    expect(textInputRef.current.isFocused()).toBe(false);
  });

  it('should have support for being focused and blurred', () => {
    const textInputRef = createTextInput();

    expect(textInputRef.current.isFocused()).toBe(false);
    ReactNative.findNodeHandle = jest.fn().mockImplementation(ref => {
      if (ref == null) {
        return null;
      }

      if (
        ref === textInputRef.current ||
        ref === textInputRef.current.getNativeRef()
      ) {
        return 1;
      }

      return 2;
    });

    TextInput.State.focusTextInput(textInputRef.current);
    expect(textInputRef.current.isFocused()).toBe(true);
    expect(TextInput.State.currentlyFocusedInput()).toBe(textInputRef.current);

    TextInput.State.blurTextInput(textInputRef.current);
    expect(textInputRef.current.isFocused()).toBe(false);
    expect(TextInput.State.currentlyFocusedInput()).toBe(null);
  });

  it('should unfocus when other TextInput is focused', () => {
    const textInputRe1 = React.createRef(null);
    const textInputRe2 = React.createRef(null);

    ReactTestRenderer.create(
      <>
        <TextInput ref={textInputRe1} value="value1" />
        <TextInput ref={textInputRe2} value="value2" />
      </>,
    );
    ReactNative.findNodeHandle = jest.fn().mockImplementation(ref => {
      if (
        ref === textInputRe1.current ||
        ref === textInputRe1.current.getNativeRef()
      ) {
        return 1;
      }

      if (
        ref === textInputRe2.current ||
        ref === textInputRe2.current.getNativeRef()
      ) {
        return 2;
      }

      return 3;
    });

    expect(textInputRe1.current.isFocused()).toBe(false);
    expect(textInputRe2.current.isFocused()).toBe(false);

    TextInput.State.focusTextInput(textInputRe1.current);

    expect(textInputRe1.current.isFocused()).toBe(true);
    expect(textInputRe2.current.isFocused()).toBe(false);
    expect(TextInput.State.currentlyFocusedInput()).toBe(textInputRe1.current);

    TextInput.State.focusTextInput(textInputRe2.current);

    expect(textInputRe1.current.isFocused()).toBe(false);
    expect(textInputRe2.current.isFocused()).toBe(true);
    expect(TextInput.State.currentlyFocusedInput()).toBe(textInputRe2.current);
  });

  it('should render as expected', () => {
    expectRendersMatchingSnapshot(
      'TextInput',
      () => <TextInput />,
      () => {
        jest.dontMock('../TextInput');
      },
    );
  });
});