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 use it
GdUnit4 lets Godot teams cover gameplay logic, nodes, and scenes inside the familiar project environment, adding regression tests and failure diagnosis without maintaining a separate external harness.
Where it fits
Use testing, performance, accessibility, and diagnostic tools to remove problems players will notice.
What to check
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.