A joke only Flutter developers would understand

Developer: “YESSS! My world-class widget test is ready to run.”

(runs the test)

Debug Console: “Expected to see 1 widget, found none.”

Developer: What! Why, why, why!!!

(figures out all async calls in the widget; spends 4 hours re-reading about widget testing, exploring the source code of WidgetTester.pump() and setting up mock classes using Mockito.)

Developer: “Muwaha haha! I am the greatest mocker ever lived.”

(runs the test again)

Debug Console: “A RenderFlex overflowed by 20 pixels on the right.”