Node.js Testing & Debugging

In this tutorial, we'll cover how to test and debug Node.js applications. We'll go over basic testing concepts, tools, and techniques to catch errors and ensure your code runs as expected.

1. Unit Testing with Mocha

Mocha is a popular testing framework for Node.js that allows you to write unit tests for your applications.

const assert = require('assert');
describe('Array', function() {
    it('should return -1 when the value is not present', function() {
        assert.equal([1, 2, 3].indexOf(4), -1);
    });
});

This simple Mocha test checks that the indexOf method returns -1 when an element is not found in an array.

2. Debugging with Node.js

Node.js has built-in debugging features that you can use to inspect your application while it runs.

node inspect app.js

You can use the `node inspect` command to start a debugging session in your terminal. This allows you to set breakpoints and step through your code.

3. Using Debugging Tools in VS Code

Visual Studio Code provides excellent debugging tools for Node.js. You can set breakpoints, inspect variables, and step through your code in the IDE.

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "skipFiles": ["<node_internals>/**"],
            "program": "${workspaceFolder}/app.js"
        }
    ]
}

This VS Code configuration file allows you to launch and debug your Node.js application directly from the editor.

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Node.js Testing & Debugging

1. Unit Testing with Mocha

2. Debugging with Node.js

3. Using Debugging Tools in VS Code

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