Visual Regression Testing with Wraith

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Visual regression testing is a technique to test styles by comparing screenshots of a website over time to detect visual changes. It helps ensure plugins or code updates don't break the appearance of a site. Wraith is a tool that automates visual regression testing - it takes screenshots of a site, compares them, and flags differences. While Wraith currently lacks flexbox support, the next PhantomJS version may include it. However, PhantomJS' main developer stepping down creates uncertainty over its future maintenance.

Engineering

Table of
contents
1. What?
2. Why?
3. How?

Visual Regression
Testing is a way to test
the styles

What is the
number one reason
your site breaks?

“Meh, I always disable
the styles of plugins”

Next major version of PhantomJS
will support flexbox
Beta:
https://bitbucket.org/ariya/phantomjs/downloads/

Main developer of PhantomJS is
stepping down as maintainer
What does this mean
for Wraith?

Experienced software engineer, currently working mainly in JavaScript and React Native. Passionate about open source and building delightful mobile experiences Speech Overview: Components are commonly tested with snapshots of the rendered DOM. While it’s beneficial when working with untested legacy systems, often it’s a high noise and high maintenance approach that easily lets regressions slip by. It’s now considered bad practice having it as the single testing strategy. Loki is a visual testing tool that has similar benefits as snapshot testing in that it’s quick and easy to get started, but fewer of the downsides – refactors are not flagged as regressions and discerning desirable from unintended changes is much easier. Last year it gained a place in the ThoughtWorks Tech Radar and has since matured to support advanced use cases with massive parallelization using lambdas. The talk outlines successful strategies for visual testing in general, pitfalls to avoid and how to get started in under a minute

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