Enzyme unit test is passing test when it should fail - reactjs

Question

I'm trying to test a component it has two props title, and url.
I'm unsure how to pass mock data, i made an attempt but it passes but im pretty sure its not reading whats in the data object
Both tests are passing.
Card.js
import React, {Component} from 'react';
const Styles = {
width: '300px',
height: '300px'
}
class Card extends React.Component {
render() {
return (
<div>
{/* Renders title of the GIY */}
<h1>{this.props.title}</h1>
<div >
<img alt="" src={this.props.url}/>
</div>
</div>
);
}
}
export default Card;
Card.test.js
import React from 'react';
import ReactDOM from 'react-dom';
import {shallow} from 'enzyme';
import Card from './Card';
describe('Should render Card Component', ()=> {
it('should render card component', ()=> {
const component = shallow(<Card />);
})
});
describe('Should render title/ url prop', ()=>{
it('should render title /url prop', ()=>{
// trying to mock data for the Card component
const data = {
title: "owl",
url:"https://giphy.com/gifs/bird-owl-qISaMW1xwmvNS"
}
const component = shallow(<Card title={data.title} url={data.url}/>)
})
})

Answer 1

You're not making any assertions. You need to expect some result to happen.
Card.js (this can be a pure function if it doesn't require state)
import React from "react";
import PropTypes from "prop-types";
const styles = {
width: "300px",
height: "300px"
};
const Card = ({ title, url }) =>
title && url ? ( // if a title and url are passed in, return <div>...</div>, else return "null"
<div className="card">
<h1>{title}</h1>
<div>
<img alt="" src={url} styles={styles} />
</div>
</div>
) : null;
// PropTypes will throw a warning if either of them is missing
PropTypes.propTypes = {
title: PropTypes.string.isRequired,
url: PropTypes.string.isRequired
};
export default Card;
Card.test.js
import React from "react";
import { shallow } from "enzyme";
import Card from "../index";
// we define initial props (empty strings)
const initialProps = {
title: "",
url: ""
};
// we shallow wrap the Card while passing in the "initialProps"
const wrapper = shallow(<Card {...initialProps} />);
// we define some props that will be passed in during our second test
const nextProps = {
title: "owl",
url: "https://media.giphy.com/media/qISaMW1xwmvNS/giphy.gif"
};
describe("Card Component", () => {
afterAll(() => wrapper.unmount());
it("shouldn't render a card without the required props", () => {
expect(wrapper.type()).toBeNull();
});
it("should render a card if the required props are present", () => {
wrapper.setProps({ ...nextProps }); // we update the component with "nextProps"
expect(wrapper.find("div.card")).toHaveLength(1); // expect "div.card" to be present
expect(wrapper.find("h1").text()).toContain(nextProps.title); // expect the "h1" element to contain "owl"
expect(wrapper.find("img").prop("src")).toBe(nextProps.url); // expect the "img"'s src to be "https://media.giphy.com/media/qISaMW1xwmvNS/giphy.gif"
});
});
Working example: https://codesandbox.io/s/k35zpqwk97