visibleForTesting top-level constant

_VisibleForTesting const visibleForTesting

Used to annotate a declaration was made public, so that it is more visible than otherwise necessary, to make code testable.

Tools, such as the analyzer, can provide feedback if

  • the annotation is associated with a declaration not in the lib folder of a package, or a private declaration, or a declaration in an unnamed static extension, or
  • the declaration is referenced outside of its the defining library or a library which is in the test folder of the defining package.


const _VisibleForTesting visibleForTesting = const _VisibleForTesting();