Run the "test" script defined in package.json
📦 Node.js-> Command Line
✨ The Prompt Phrase
npm test
💻 Code Preview
📦 All-in-One Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Run the "test" script defined in package.json - Interactive Tutorial</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700;900&family=Fira+Code:wght@400;500;600&display=swap" rel="stylesheet">
<style>
:root {
--bg-primary: #0a0e27;
--bg-secondary: #151932;
--bg-card: #1e2139;
--accent-purple: #a855f7;
--accent-blue: #3b82f6;
--accent-green: #10b981;
--accent-red: #ef4444;
--accent-yellow: #f59e0b;
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body {
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color: var(--text-primary);
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.test-icon {
font-size: 5rem;
margin-bottom: 20px;
animation: testBounce 2s ease-in-out infinite;
}
@keyframes testBounce {
0%, 100% { transform: translateY(0) rotate(0deg); }
25% { transform: translateY(-10px) rotate(-5deg); }
75% { transform: translateY(-10px) rotate(5deg); }
}
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0%, 100% { transform: scale(1); }
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.demo-container {
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.terminal {
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color: white;
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font-size: 1.1rem;
font-weight: 600;
cursor: pointer;
transition: all 0.3s ease;
display: inline-flex;
align-items: center;
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margin: 10px;
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box-shadow: 0 10px 30px rgba(168, 85, 247, 0.4);
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cursor: pointer;
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font-size: 1rem;
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color: white;
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border-radius: 12px;
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border-radius: 10px;
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border-left: 4px solid var(--accent-pink);
}
.info::before { content: '🔍 '; font-size: 1.5rem; }
.quiz-container {
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border-radius: 20px;
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border: 2px solid transparent;
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transform: translateX(10px);
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.quiz-option.incorrect {
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background: rgba(239, 68, 68, 0.1);
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padding: 15px;
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.quiz-feedback.show {
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.quiz-feedback.correct {
background: rgba(16, 185, 129, 0.1);
border-left: 4px solid var(--accent-green);
}
.quiz-feedback.incorrect {
background: rgba(239, 68, 68, 0.1);
border-left: 4px solid var(--accent-red);
}
.cheat-sheet {
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border-radius: 20px;
padding: 40px;
margin: 30px 0;
color: white;
}
.cheat-grid {
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grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 20px;
margin-top: 30px;
}
.cheat-item {
background: rgba(255, 255, 255, 0.15);
backdrop-filter: blur(10px);
padding: 20px;
border-radius: 15px;
border: 1px solid rgba(255, 255, 255, 0.2);
}
.cheat-item h4 {
color: white;
margin-bottom: 10px;
font-weight: 600;
}
.cheat-item code {
background: rgba(0, 0, 0, 0.3);
padding: 4px 8px;
border-radius: 5px;
font-size: 0.9rem;
color: white;
}
.highlight {
color: var(--accent-yellow);
font-weight: 600;
}
.footer {
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margin-top: 80px;
border-radius: 20px;
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color: var(--text-secondary);
margin: 10px 0;
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.badge {
display: inline-block;
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border-radius: 20px;
font-size: 0.85rem;
font-weight: 600;
margin: 5px;
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.confetti {
position: fixed;
width: 10px;
height: 10px;
background: var(--accent-purple);
animation: confetti-fall 3s linear forwards;
z-index: 9999;
}
@keyframes confetti-fall {
to {
transform: translateY(100vh) rotate(360deg);
opacity: 0;
}
}
@media (max-width: 768px) {
.hero h1 { font-size: 2rem; }
.command-display { font-size: 1.2rem; padding: 15px 20px; }
.section-title { font-size: 1.8rem; }
.card { padding: 25px; }
.step { padding-left: 80px; }
.step::before { width: 50px; height: 50px; font-size: 1.5rem; }
}
</style>
</head>
<body>
<div class="progress-container">
<div class="progress-bar" id="progressBar"></div>
</div>
<div class="hero">
<div class="hero-content">
<div class="test-icon">🧪</div>
<h1>Master npm test!</h1>
<div class="command-display">npm test</div>
<p>Run your tests and ensure code quality! ✅</p>
</div>
</div>
<div class="container">
<!-- What Is It -->
<section class="section">
<h2 class="section-title">🤔 What Is npm test?</h2>
<div class="card">
<p style="font-size: 1.2rem; margin-bottom: 20px;">
This command <span class="highlight">runs</span> the <strong>"test" script</strong> defined in your package.json file! 🧪
</p>
<p style="margin-bottom: 20px;">
Think of it like a quality control check for your code! 🔍 It executes your test suite to verify that your code works as expected, catching bugs before they reach production!
</p>
<div class="info">
<strong>Breaking It Down:</strong>
<ul style="margin-left: 30px; margin-top: 10px; line-height: 2;">
<li><code>npm</code> - Node Package Manager</li>
<li><code>test</code> - Runs the "test" script from package.json</li>
<li>Common uses: Run Jest, Mocha, Jasmine, or any test framework</li>
</ul>
</div>
<div style="margin-top: 30px;">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Why Testing Matters? 🔍</h3>
<p>Testing ensures your code works correctly, prevents regressions, and gives you confidence when making changes. It's like having a safety net for your code!</p>
</div>
</div>
</section>
<!-- Why Use It -->
<section class="section">
<h2 class="section-title">✨ Why Use npm test?</h2>
<div class="card">
<div class="feature-grid">
<div class="feature-card">
<div class="feature-icon">🐛</div>
<div class="feature-title">Catch Bugs Early</div>
<p style="color: var(--text-secondary);">Find issues before production!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🔒</div>
<div class="feature-title">Code Confidence</div>
<p style="color: var(--text-secondary);">Make changes without fear!</p>
</div>
<div class="feature-card">
<div class="feature-icon">📝</div>
<div class="feature-title">Documentation</div>
<p style="color: var(--text-secondary);">Tests show how code works!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🚀</div>
<div class="feature-title">CI/CD Ready</div>
<p style="color: var(--text-secondary);">Automate quality checks!</p>
</div>
<div class="feature-card">
<div class="feature-icon">🎯</div>
<div class="feature-title">Regression Prevention</div>
<p style="color: var(--text-secondary);">Stop old bugs from returning!</p>
</div>
<div class="feature-card">
<div class="feature-icon">✅</div>
<div class="feature-title">Quality Assurance</div>
<p style="color: var(--text-secondary);">Maintain high standards!</p>
</div>
</div>
</div>
</section>
<!-- How It Works -->
<section class="section">
<h2 class="section-title">⚙️ How Does It Work?</h2>
<div class="card">
<div class="steps">
<div class="step">
<h3>Step 1: Reads package.json</h3>
<p>npm looks for the "test" script in the scripts section.</p>
</div>
<div class="step">
<h3>Step 2: Executes Test Command</h3>
<p>Runs the test framework command (Jest, Mocha, etc.).</p>
</div>
<div class="step">
<h3>Step 3: Runs Test Files</h3>
<p>The test framework finds and executes all test files.</p>
</div>
<div class="step">
<h3>Step 4: Reports Results</h3>
<p>Shows which tests passed ✅ and which failed ❌.</p>
</div>
<div class="step">
<h3>Step 5: Exit Code</h3>
<p>Returns 0 for success, non-zero for failures (important for CI/CD)! 🎉</p>
</div>
</div>
</div>
</section>
<!-- Live Demo -->
<section class="section">
<h2 class="section-title">🎮 Interactive Demo</h2>
<div class="demo-container">
<h3 style="margin-bottom: 20px; font-size: 1.5rem;">See npm test in Action! 🚀</h3>
<button class="demo-button" onclick="simulateTestPass()">
<span>✅</span>
<span>Run Tests (All Pass)</span>
</button>
<button class="demo-button" onclick="simulateTestFail()">
<span>❌</span>
<span>Run Tests (With Failures)</span>
</button>
<div class="terminal" id="terminal">
<div class="terminal-line">
<span class="terminal-prompt">$</span>
<span style="color: var(--text-secondary);"> Ready for command...</span>
</div>
</div>
</div>
</section>
<!-- Code Breakdown -->
<section class="section">
<h2 class="section-title">💻 Test Framework Examples</h2>
<div class="card">
<div class="tabs">
<button class="tab active" onclick="switchTab('jest')">Jest</button>
<button class="tab" onclick="switchTab('mocha')">Mocha</button>
<button class="tab" onclick="switchTab('custom')">Custom</button>
</div>
<div id="jest" class="tab-content active">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Jest Testing Framework</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('jest-code')">📋 Copy</button>
</div>
<pre><code id="jest-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"name"</span>: <span class="code-string">"my-app"</span>,
<span class="code-property">"scripts"</span>: {
<span class="code-property">"test"</span>: <span class="code-string">"jest"</span>
},
<span class="code-property">"devDependencies"</span>: {
<span class="code-property">"jest"</span>: <span class="code-string">"^29.0.0"</span>
}
}
<span class="code-comment"># Run tests:</span>
npm test
<span class="code-comment"># Watch mode:</span>
npm test -- --watch</code></pre>
</div>
<div class="success" style="margin-top: 15px;">
<strong>Jest is popular because:</strong> Zero config, fast, built-in coverage, snapshot testing!
</div>
</div>
<div id="mocha" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Mocha + Chai</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('mocha-code')">📋 Copy</button>
</div>
<pre><code id="mocha-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"scripts"</span>: {
<span class="code-property">"test"</span>: <span class="code-string">"mocha"</span>
},
<span class="code-property">"devDependencies"</span>: {
<span class="code-property">"mocha"</span>: <span class="code-string">"^10.0.0"</span>,
<span class="code-property">"chai"</span>: <span class="code-string">"^4.3.0"</span>
}
}
<span class="code-comment"># Run tests:</span>
npm test</code></pre>
</div>
</div>
<div id="custom" class="tab-content">
<h3 style="color: var(--accent-pink); margin-bottom: 15px;">Custom Test Scripts</h3>
<div class="code-block">
<div class="code-header">
<div class="terminal-dots">
<div class="terminal-dot dot-red"></div>
<div class="terminal-dot dot-yellow"></div>
<div class="terminal-dot dot-green"></div>
</div>
<button class="copy-btn" onclick="copyCode('custom-code')">📋 Copy</button>
</div>
<pre><code id="custom-code"><span class="code-comment">// package.json</span>
{
<span class="code-property">"scripts"</span>: {
<span class="code-property">"test"</span>: <span class="code-string">"jest"</span>,
<span class="code-property">"test:watch"</span>: <span class="code-string">"jest --watch"</span>,
<span class="code-property">"test:coverage"</span>: <span class="code-string">"jest --coverage"</span>,
<span class="code-property">"test:unit"</span>: <span class="code-string">"jest --testPathPattern=unit"</span>,
<span class="code-property">"test:e2e"</span>: <span class="code-string">"jest --testPathPattern=e2e"</span>
}
}
<span class="code-comment"># Run different test types:</span>
npm test <span class="code-comment"># All tests</span>
npm run test:watch <span class="code-comment"># Watch mode</span>
npm run test:coverage <span class="code-comment"># With coverage</span></code></pre>
</div>
<div class="tip" style="margin-top: 15px;">
<strong>Pro Tip:</strong> Create different test scripts for unit, integration, and e2e tests!
</div>
</div>
</div>
</section>
<!-- Common Mistakes -->
<section class="section">
<h2 class="section-title">❌ Common Mistakes</h2>
<div class="card">
<div class="accordion">
<div class="accordion-item">
<div class="accordion-header" onclick="toggleAccordion(this)">
<span><strong>1. No Test Script Defined</strong></span>
<span class="accordion-icon">▼</span>
</div>
<div class="accordion-content">
<div class="accordion-body">
<div class="warning">
<strong>Problem:</strong> Running npm test without a test script in package.json!
</div>
<div class="success" style="margin-top: 15px;">
<strong>Solution:</strong> Add a "test" script: <code>"test": "jest"</code> or your test framework!
</div>
</div>
</div>
</div>
<div class="accordion-item">
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<span><strong>2. Not Installing Test Framework</strong></span>
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<strong>Problem:</strong> Test script references a framework that's not installed!
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<strong>Solution:</strong> Install it: <code>npm install --save-dev jest</code>
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<span><strong>3. Ignoring Test Failures</strong></span>
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<strong>Problem:</strong> Committing code when tests are failing!
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<strong>Solution:</strong> Always fix failing tests before committing. Use git hooks to enforce this!
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<strong>Use watch mode</strong> during development: <code>npm test -- --watch</code> (for Jest)
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<strong>Check coverage</strong> to see how much code is tested: <code>npm test -- --coverage</code>
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<strong>Run specific tests</strong> with patterns: <code>npm test -- --testNamePattern="login"</code>
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<strong>Use pre-commit hooks</strong> with Husky to run tests before commits!
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<strong>Add to CI/CD</strong> - Run npm test in your pipeline to catch issues early!
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<strong>Write tests first</strong> - Try Test-Driven Development (TDD) for better code design!
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<h3>Question 1: What does npm test do?</h3>
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<h3 style="margin-bottom: 20px; font-size: 2rem;">npm test Cheat Sheet! 🔖</h3>
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<h4>🧪 Basic</h4>
<p><code>npm test</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Run all tests</p>
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<h4>⚡ Shorthand</h4>
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<p style="font-size: 0.85rem; margin-top: 5px;">Quick alias</p>
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<h4>👀 Watch Mode</h4>
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<h4>🎯 Specific Test</h4>
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<h4>🔍 Pattern Match</h4>
<p><code>npm test -- --testNamePattern="auth"</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Filter by name</p>
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<h4>🐛 Debug</h4>
<p><code>node --inspect-brk node_modules/.bin/jest</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Debug tests</p>
</div>
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<h4>📝 Update Snapshots</h4>
<p><code>npm test -- -u</code></p>
<p style="font-size: 0.85rem; margin-top: 5px;">Update Jest snapshots</p>
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