Why and how I was creating internal screenshot testing library for Android The goal of this article is to prevent issues and highlight non-obvious aspects of screenshot testing in the context of …

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A developer shares their experience building a custom screenshot testing library for Android after outgrowing the third-party Shot library. The post covers the mathematical complexity of UI component combinations in a design system, the decision to build an in-house solution, and a detailed technical walkthrough including: configuring ActivityScenario, extending AndroidJUnitRunner, capturing bitmaps from views, and writing a Gradle plugin that pulls screenshots from the emulator, performs pixel-by-pixel comparison with configurable tolerance, and generates an HTML diff report. Key practical challenges addressed include emoji rendering differences across API versions, flaky tests from deferred image loading, fixed-width rendering for consistency, and Windows path compatibility.

Why and how I was creating internal screenshot testing library for Android

#2. Integrating custom test configuration into AndroidJUnitRunner

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#4. Gradle Plugin for convenient test execution, screenshot comparison, and report generation