"We picked Flutter because it promised one codebase for everything. But now we have three separate testing strategies, and none of them work well." That sentence keeps coming up in every conversation I have with Flutter engineering leads. And the frustration is justified. Flutter's development experience is excellent: hot reload, the widget system, and Impeller's rendering engine. But the moment you try to test what you've built, the experience falls off a cliff. Flutter holds 46% market share among cross-platform frameworks. Over 26,000 companies use it in production, including Google Pay, BMW, Nubank, Alibaba, and Toyota. And yet, the testing ecosystem remains the weakest layer in the stack. Google's built-in tools can't cross the native boundary. Community tools like Patrol and Appium fill gaps but add selector maintenance. And Flutter's custom rendering engine makes every selector-based approach structurally more fragile than it would be on native iOS or Android.…