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Mutation testing in PHP with Humbug

This repository is the source code for my presentation Mutation testing in PHP with Humbug. The tool used to write this presentation is spectacle a React based presentation library. To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000. The latest version of this presentation can be found on mutation.markredeman.nl.

Abstract

Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code. This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug. By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.

This talk introduces the concept of mutation testing. First we show that using code coverage as a metric of quality of a test suite is flawed. Next we show that by using mutation testing we can find bugs in code which has 100% code coverage. An overview is given on how a mutation testing tool works and some of its disadvantages are discussed. Most of these disadvantages however, can be solved by writing well designed software. Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.

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Slides for my talk on mutation testing in php

mutation.markredeman.nl

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
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3 stars
Watchers
2 watching
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1 fork
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
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3 stars
Watchers
2 watching
Forks
1 fork
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
Stars
3 stars
Watchers
2 watching
Forks
1 fork
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
Stars
3 stars
Watchers
2 watching
Forks
1 fork
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
Stars
3 stars
Watchers
2 watching
Forks
1 fork
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
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3 stars
Watchers
2 watching
Forks
1 fork
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Mutation testing in PHP with Humbug
This repository is the source code for my presentation Mutation testing in PHP with Humbug.
The tool used to write this presentation is spectacle a React based presentation library.
To build the presentation run npm run build or npm run start (which starts a server so that you can view the presentation on http://localhost:3000.
The latest version of this presentation can be found on mutation.markredeman.nl.
Abstract
Mutation testing is a technique that measures the quality of a test suite and helps you write more robust code.
This is done by making small changes (mutations) to code under the assumption that each mutation introduces a bug.
By automating this process we can find bugs in our code that can't be detected by traditional code coverage tools.
This talk introduces the concept of mutation testing.
First we show that using code coverage as a metric of quality of a test suite is flawed.
Next we show that by using mutation testing we can find bugs in code which has 100% code coverage.
An overview is given on how a mutation testing tool works and some of its disadvantages are discussed.
Most of these disadvantages however, can be solved by writing well designed software.
Lastly we will take a look at Humbug, a mutation testing tool for PHP and we conclude with a few examples of how a mutation testing tool can help you improve your software and how it can fit in your current workflow.
About
Slides for my talk on mutation testing in php
mutation.markredeman.nl
Resources
Readme
Activity
Stars
3 stars
Watchers
2 watching
Forks
1 fork
Report repository
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