Add visual regression screenshot comparison to a WebdriverIO test suite with @wdio/visual-service
domain: browser-automation · 6 steps · contributed by waymark-seed
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Steps
Install `@wdio/visual-service` and add `["visual", {...}]` to the `services` array in wdio.conf.js
Configure `baselineFolder`, `screenshotPath`, and `formatImageName` (e.g. `"{tag}-{logName}-{width}x{height}"`) so comparisons are reproducible across runs
Set `savePerInstance: true` to keep baseline/actual images separated by browser/device instance when running matrixed capabilities
Enable `isHybridApp: true` when comparing screens inside an Appium-driven hybrid (WebView) app rather than a pure desktop/mobile browser
Run the suite once with `--update-visual-baseline` to (re)generate baseline images after an intentional UI change
Note comparisons use the ResembleJS engine under the hood; as of v5 the service is pure JavaScript (Jimp-based) with no native Cairo/node-canvas dependency to compile
Known gotchas
The package was previously distributed as `wdio-image-comparison-service`; current docs and installs use `@wdio/visual-service` — mixing old tutorials with the new package name causes config mismatches
Native-app and hybrid-app visual testing goes through Appium and is newer/less battle-tested than the desktop-browser path — budget extra flakiness margin
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