Failed unit test: TypeError: Cannot read properties of undefined (reading 'rootedDetectionMethods')

[ducminhleeh]

I have used jail-monkey for my app. But when i wrote the unit test, i found the problem like this:
TypeError: Cannot read properties of undefined (reading 'rootedDetectionMethods')

This is my code and test
Code:

  const onLoginPress = () => {
    if (Platform.OS === 'ios') {
      if (JailMonkey.isJailBroken()) {
        // do something
        return;
      }
    }
  };

Test:

// Import the `jail-monkey` package
import JailMonkey from 'jail-monkey';

// Import any necessary components for your UI
import MyButton from './MyButton';
import MyJailbreakWarning from './MyJailbreakWarning';

describe('MyButton', () => {
  it('should show jailbreak warning when clicked on jailbroken device', () => {
    // Set the mock implementation to return true for jailbreak detection
    JailMonkey.isJailBroken.mockReturnValueOnce(true);

    // Render the component that contains the button and the jailbreak warning
    const { getByText, getByTestId } = render(<MyButton />);

    // Simulate a user click on the button
    const button = getByTestId('my-button');
    fireEvent.press(button);

    // Expect the jailbreak warning component to be present in the rendered output
    const jailbreakWarning = getByText('Warning: Your device is jailbroken.');
    expect(jailbreakWarning).toBeDefined();
  });

  it('should not show jailbreak warning when clicked on non-jailbroken device', () => {
    // Set the mock implementation to return false for jailbreak detection
    JailMonkey.isJailBroken.mockReturnValueOnce(false);

    // Render the component that contains the button and the jailbreak warning
    const { getByText, getByTestId } = render(<MyButton />);

    // Simulate a user click on the button
    const button = getByTestId('my-button');
    fireEvent.press(button);

    // Expect the jailbreak warning component to not be present in the rendered output
    const jailbreakWarning = queryByText('Warning: Your device is jailbroken.');
    expect(jailbreakWarning).toBeNull();
  });
});

Can anyone help me to explain why this issue occurs? Thanks 🤔

[ducminhleeh]

Thanks everyone, this is my bad

[murilogok]

Solved by doing:

jest.mock('react-native', () => {
  const RN = jest.requireActual('react-native'); // use original implementation, which comes with mocks out of the box

  RN.NativeModules.JailMonkey = jest.requireActual('jail-monkey');

  return RN;
});