Short Intro to Testing - What, How, Why

What is Testing?

Testing is the process of evaluating and verifying that a piece of software or application works as intended. It helps identify bugs, ensure quality, and improve performance.

Why is Testing Important?

Testing is crucial because it:

Ensures the software meets requirements

Identifies and fixes bugs

Improves user experience

Enhances security

How to Test?

One common approach is the Arrange, Act, Assert (AAA) pattern:

Arrange: Set up the conditions for your test. This includes initializing objects, setting up data, and preparing the environment.

Act: Execute the code or function you want to test.

Assert: Verify that the outcome matches your expectations.

Example in JavaScript

Here’s a simple example using JavaScript:


function add(a, b) {
  return a + b;
}

// Test

// Arrange
const num1 = 2;
const num2 = 3;
const expected = 5;

// Act
const result = add(num1, num2);

// Assert
console.assert(result === expected, `Expected ${expected}, but got ${result}`);

In this example:

Arrange: We set up two numbers and the expected result.

Act: We call the add function with the arranged numbers.

Assert: We check that the function's result matches the expected value.

By following these basics, beginners can start writing effective tests to ensure their JavaScript code is reliable and bug-free.