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Unit Testing with Jest

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answer Unit Testing with Jest

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Unit Testing with Jest

Comment

// myMath.js

const myMath = {
  sum: (a, b) => a + b,
  subtract: (a, b) => a - b,
};

module.exports = myMath;

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Contributed on Sep 12 2023

YOU.com

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jest testing step by step

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jest testing step by step 
https://github.com/moamahfouz/jest-testing-step-by-step

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Source: Grepper

Tags: javascript step

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Contributed on Mar 04 2024

Vast Vulture

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how to do jest unit test in react

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test('render h1 element', () => {
  render(<App />);

  screen.debug();

  expect(screen.getByText('Hello World')).toBeInTheDocument();
});

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Source: academind.com

Tags: javascript j

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Contributed on Apr 19 2022

Energetic Eagle

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jest unit testing react example

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// Example of a unit test for a React component with Jest

import React from 'react';
import { render, screen } from '@testing-library/react';
import MyComponent from './MyComponent';

test('renders MyComponent', () => {
  render(<MyComponent />);
  const myComponentElement = screen.getByText(/My Component/i);
  expect(myComponentElement).toBeInTheDocument();
});

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Contributed on Sep 12 2023

YOU.com

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testing jest

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const cal = require('../index');

test('adds 1 + 2 to equal 3', () => {
  expect(cal.sum(1, 2)).toBe(3);
  expect(cal.sum(1, 2)).not.toBe(4);
  expect(cal.sum(1, 2)).toBeGreaterThan(2);
  expect(cal.sum(1, 2)).toBeLessThan(4);
  expect(cal.sum(1, 2)).toBeCloseTo(3);
  // Testing datatype
  expect(typeof cal.sum(1, 2)).toBe("number");
});

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Source: itsvinayak.hashnode.dev

Tags: javascript j

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Contributed on Jun 07 2022

itsvinayak

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testing with jest

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npm i jest --save -dev
-> In Package.json change the Script object(watchAll - jest will run auto)
"test" : "jest --watchAll"
-> test file should be named such way that re used by jest can recognize it
like filename.<test> or <spec> or skip it.js
Ex: sum.test.js or sum.spec.js or sum.js
-> require the target for testing file in this test file then enjoy testing.
-> visit jestWebsite-> Docs.

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Contributed on Oct 04 2020

VeNOM

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jest test cases

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test('Addition test', () => {
  // Arrange
  const a = 2;
  const b = 3;

  // Act
  const result = a + b;

  // Assert
  expect(result).toBe(5);
});

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Contributed on Sep 11 2023

YOU.com

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Writing Unit Tests in Javascript Using JEST

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const cal = require('../index');

let a;
let b;

beforeEach(() => {
  a = Math.floor(Math.random() * 100);
  b = Math.floor(Math.random() * 100);
});


test(" testing sum " + a + " " + b + " function ", () => {
  expect(cal.sum(a, b)).toBe(a + b);
  expect(cal.sum(a, b)).not.toBe(a + b + 1);
  expect(cal.sum(a, b)).toBeGreaterThan(a + b - 1);
  expect(cal.sum(a, b)).toBeLessThan(a + b + 1);
  expect(cal.sum(a, b)).toBeCloseTo(a + b);
  // Testing datatype
  expect(typeof cal.sum(a, b)).toBe("number");
});

test(" testing diff " + a + " " + b + " function ", () => {
  expect(cal.diff(a, b)).toBe(a - b);
  expect(cal.diff(a, b)).not.toBe(a - b + 1);
  expect(cal.diff(a, b)).toBeGreaterThan(a - b - 1);
  expect(cal.diff(a, b)).toBeLessThan(a - b + 1);
  expect(cal.diff(a, b)).toBeCloseTo(a - b);
  // Testing datatype
  expect(typeof cal.diff(a, b)).toBe("number");
});

test(" testing mul " + a + " " + b + " function ", () => {
  expect(cal.mul(a, b)).toBe(a * b);
  expect(cal.mul(a, b)).not.toBe(a * b + 1);
  expect(cal.mul(a, b)).toBeGreaterThan(a * b - 1);
  expect(cal.mul(a, b)).toBeLessThan(a * b + 1);
  expect(cal.mul(a, b)).toBeCloseTo(a * b);
  // Testing datatype
  expect(typeof cal.mul(a, b)).toBe("number");
});


test(" testing div " + a + " " + b + " function ", () => {
  expect(cal.div(a, b)).toBe(a / b);
  expect(cal.div(a, b)).not.toBe(a / b + 1);
  expect(cal.div(a, b)).toBeGreaterThan(a / b - 1);
  expect(cal.div(a, b)).toBeLessThan(a / b + 1);
  expect(cal.div(a, b)).toBeCloseTo(a / b);
  // Testing datatype
  expect(typeof cal.div(a, b)).toBe("number");
});

test(" testing mod " + a + " " + b + " function ", () => {
  expect(cal.mod(a, b)).toBe(a % b);
  expect(cal.mod(a, b)).not.toBe(a % b + 1);
  expect(cal.mod(a, b)).toBeGreaterThan(a % b - 1);
  expect(cal.mod(a, b)).toBeLessThan(a % b + 1);
  expect(cal.mod(a, b)).toBeCloseTo(a % b);
  // Testing datatype
  expect(typeof cal.mod(a, b)).toBe("number");
});

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Source: itsvinayak.hashnode.dev

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Contributed on Jul 20 2022

itsvinayak

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how to write unit test cases in react js using jest

Comment

import React, { useState } from "react";

const Counter = () => {
const [counter, setCounter] = useState(0);

const incrementCounter = () => {
setCounter((prevCounter) => prevCounter + 1);
};

const decrementCounter = () => {
setCounter((prevCounter) => prevCounter - 1);
};

return (
<>
<button data-testid="increment" onClick={incrementCounter}>
+
</button>
<p data-testid="counter">{counter}</p>
<button disabled data-testid="decrement" onClick={decrementCounter}>
-
</button>
</>
);
};

export default Counter;

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Source: www.codingninjas.com

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Contributed on Apr 01 2023

Prickly Pigeon

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Unit Testing with Jest

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Unit Testing with Jest

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