Chapter 42 — Testing, Performance, and Publishing

Level: intermediate / advanced Estimated time: 12 hrs Prerequisites: chapters 35 through 40 (the complete "Dart Dungeon" game), chapter 41 (specifications and GDD), chapter 16 (Dart project, pubspec.yaml, dart test), chapter 20 (game loop, FPS, delta time) Flutter version used: Flutter 3.44 / Dart 3.12 Flame version used: Flame 1.38.0, flame_test 2.2.4 Commands and procedures verified on: August 8, 2026 against docs.flutter.dev (/testing/overview, /perf, /perf/ui-performance, /tools/devtools/performance, /deployment/android, /deployment/web, /deployment/windows, /platform-integration/web/renderers), docs.flame-engine.org/latest/flame/other/debug.html, and pub.dev/packages/flame_test. What you will be able to do by the end: write an automated test suite for a Flame game, measure and fix an FPS drop with DevTools, then produce and publish a signed Android APK and a hosted web version.

42.0 — Chapter Objectives

By the end of this chapter, you will be able to: