GdUnit4
A Godot 4 testing framework and editor plugin supporting GDScript and C# tests, parameterization, mocks, scene execution, reports, command-line runs, and continuous integration.
Why it’s here
Godot teams can cover gameplay logic, nodes, and scenes inside the familiar project environment, adding regression tests and failure diagnosis without maintaining a separate external harness.
Best fit
Testing, performance, accessibility, and diagnostics expose friction before launch.
Before you commit
Plugin versions must match the chosen Godot and .NET combination; frame-, input-, or timing-dependent scene tests still need controlled seeds, explicit waits, isolation, and headless CI validation.