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Testing components #6

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May 10, 2022
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Testing components #6

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85 changes: 79 additions & 6 deletions package-lock.json
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1 change: 1 addition & 0 deletions package.json
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Expand Up @@ -14,6 +14,7 @@
"react-icons": "^4.3.1",
"react-router-dom": "^6.3.0",
"react-scripts": "5.0.1",
"react-test-renderer": "^18.1.0",
"uuid": "^8.3.2",
"web-vitals": "^2.1.4"
},
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53 changes: 53 additions & 0 deletions src/components/calculator/__test__/Calculator.test.js
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import { render, fireEvent, screen } from '@testing-library/react';
import renderer from 'react-test-renderer';
import Calculator from '../Calculator';

it('renders "AC" on Quotes link', () => {
render(<Calculator />);
const linkElement = screen.getByText("Let's do some Maths");
expect(linkElement).toBeTruthy();
});

it('renders correctly', () => {
const tree = renderer.create(<Calculator />).toJSON();
expect(tree).toMatchSnapshot();
});

it('contains exactly 20 buttons', () => {
render(<Calculator />);

const buttons = screen.getAllByRole('button');

expect(buttons.length).toBe(20);
});

it('returns the correct result after a {2, +, 2, =} operation', () => {
render(<Calculator />);
const calcscreen = screen.getByTestId(/calc-screen/);
const twoButton = screen.getByText(/2/);
const plusButton = screen.getByText(/^[+]$/);
const equalButton = screen.getByText(/=/);

fireEvent.click(twoButton);
fireEvent.click(plusButton);
fireEvent.click(twoButton);
fireEvent.click(equalButton);

expect(calcscreen.textContent).toBe('4');
});

it('returns the correct result after a {4, ÷, 2, =} operation', () => {
render(<Calculator />);
const calcscreen = screen.getByTestId(/calc-screen/);
const oneButton = screen.getByText(/4/);
const plusButton = screen.getByText(/^[÷]$/);
const twoButton = screen.getByText(/2/);
const equalButton = screen.getByText(/=/);

fireEvent.click(oneButton);
fireEvent.click(plusButton);
fireEvent.click(twoButton);
fireEvent.click(equalButton);

expect(calcscreen.textContent).toBe('2');
});
200 changes: 200 additions & 0 deletions src/components/calculator/__test__/__snapshots__/Calculator.test.js.snap
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// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`renders correctly 1`] = `
<div
className="calc"
>
<div
className="calc-animation"
>
<h3
className="animate__animated animate__pulse animate__infinite"
>
Let's do some Maths
</h3>
<svg
className="arrow"
fill="currentColor"
height="1em"
stroke="currentColor"
strokeWidth="0"
style={
Object {
"color": undefined,
}
}
viewBox="0 0 24 24"
width="1em"
xmlns="http://www.w3.org/2000/svg"
>
<path
d="M0 0h24v24H0z"
fill="none"
/>
<path
d="M15.5 5H11l5 7-5 7h4.5l5-7z"
/>
<path
d="M8.5 5H4l5 7-5 7h4.5l5-7z"
/>
</svg>
</div>
<ul
className="calc-body"
>
<li
className="calc-screen"
data-testid="calc-screen"
>
0
</li>
<li
className="calc-keyboard"
>
<div
className="calc-digits"
>
<button
id="AC"
onClick={[Function]}
type="button"
>
AC
</button>
<button
id="+/-"
onClick={[Function]}
type="button"
>
+/-
</button>
<button
id="%"
onClick={[Function]}
type="button"
>
%
</button>
<button
id="7"
onClick={[Function]}
type="button"
>
7
</button>
<button
id="8"
onClick={[Function]}
type="button"
>
8
</button>
<button
id="9"
onClick={[Function]}
type="button"
>
9
</button>
<button
id="4"
onClick={[Function]}
type="button"
>
4
</button>
<button
id="5"
onClick={[Function]}
type="button"
>
5
</button>
<button
id="6"
onClick={[Function]}
type="button"
>
6
</button>
<button
id="1"
onClick={[Function]}
type="button"
>
1
</button>
<button
id="2"
onClick={[Function]}
type="button"
>
2
</button>
<button
id="3"
onClick={[Function]}
type="button"
>
3
</button>
<button
id="0"
onClick={[Function]}
type="button"
>
0
</button>
<button
id="00"
onClick={[Function]}
type="button"
>
00
</button>
<button
id="."
onClick={[Function]}
type="button"
>
.
</button>
</div>
<div
className="calc-operators"
>
<button
onClick={[Function]}
type="button"
>
÷
</button>
<button
onClick={[Function]}
type="button"
>
x
</button>
<button
onClick={[Function]}
type="button"
>
-
</button>
<button
onClick={[Function]}
type="button"
>
+
</button>
<button
onClick={[Function]}
type="button"
>
=
</button>
</div>
</li>
</ul>
</div>
`;
14 changes: 14 additions & 0 deletions src/components/homePage/__test__/Home.test.js
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import { render, screen } from '@testing-library/react';
import renderer from 'react-test-renderer';
import Home from '../Home';

test('renders "The history of mathematics" on homepage link', () => {
render(<Home />);
const linkElement = screen.getByText(/The history of mathematics/i);
expect(linkElement).toBeTruthy();
});

it('renders correctly', () => {
const tree = renderer.create(<Home />).toJSON();
expect(tree).toMatchSnapshot();
});