## Stub Object Brief ![[tree-stump.png|100]] A [[Software construction/Testing/Test Doubles/Test Doubles|Test double]] that feeds the desired indirect input into the [[System Under Test]]. The sub object can save us time and complicated setup by cutting off expensive dependencies. ## Illustration ![[Test-Stub-lifecycle.gif]] ## Examples - A stub object replaces an object that represents a database connection, feeding back a predefined set of objects when queried. Providing predicable test data, and saving the need for an actual database and database connection - A stub object replaces an object that makes a request to an third party service outside of the [[System Under Test]]. Providing predicable test data, removing the need to setup the third party service and performing a call that may take a long time and depend on something outside of our control > Pollards cut at about a metre above the ground are called stubs (or stubbs). > - https://en.wikipedia.org/wiki/Pollarding ## Sources http://xunitpatterns.com/Test%20Stub.html