Callback on React child using Jest

CrossButton.test.tsx

import React from 'react';
import CrossButton from './CrossButton';
import TestRenderer from 'react-test-renderer';

describe('components', () => {
    describe('<CrossButton />', () => {
        it('<FontAwesome.Button /> onPress should be called', () => {
            let called = false;
            const onCalled = () => (called = !called);

            const wrapper = TestRenderer.create(
                <CrossButton
                    onPress={onCalled}
                />);
            const child = wrapper.root.findByProps({ testID: 'FontAwesomeButton' });
            child.props.onPress();
            expect(called).toBeTruthy();
        });
    });
});