advanced.md

id	title	slug	sidebar_label
advanced_extensions	Advanced Extensions	advanced-extensions.html	Advanced Extensions

This table lists more advanced extensions that can be used to hook into the Engine itself to:

• intercept tests, skipping them, and modify test results
• intercept specs specs skipping them if required
• post process spec instances after instantiation
• modify the coroutine context used by specs and tests
• apply custom instantiation logic
• filter specs and tests
• adjust test output

Extension	Description
ConstructorExtension	Provides custom logic to instantiate spec classes. An example is the Spring extension constructor extension which autowire's spring beans.
TestCaseExtension	Intercepts calls to a test, can skip a test, override the test result, and modify the coroutine context.
SpecExtension	Intercepts calls to a spec, can skip a spec, and modify the coroutine context.
SpecRefExtension	Intercepts calls to a spec before it is instantiated. Can skip instantiation.
DisplayNameFormatterExtension	Can customize the display names of tests used in test output.
EnabledExtension	Can provide custom logic to determine if a test is enabled or disabled.
ProjectExtension	Intercepts calls to the test engine before a project starts.
SpecExecutionOrderExtension	Can sort specs before execution begins to provide a custom spec execution order.
TagExtension	Can provide active tags from arbitrary sources.
InstantiationErrorListener	Is notified when a spec fails to be instantiated due to some exception.
InstantiationListener	Is notified when a spec is successfully instantiated.
PostInstantiationExtension	Intercepts specs when they are instantiated, can replace the spec instance and modify coroutine context.
IgnoredSpecListener	Is notified when a spec is skipped.
SpecFilter	Can provide custom logic to skip a spec.
TestFilter	Can provide custom logic to skip a test.