Mock objects are used to assist (typically unit) testing of
classes in isolation. The Groovy Mock resides in the
groovy.mock.interceptor package. It is an all-groovy mock
testing library. In principle, it is used like this: Groovy
Mocks were inspired by EasyMock. Find background information
about Mocks and endo-testing under XP2000 conference paper. For
an extended example, see Using Testing Frameworks with Groovy -
typical mock style of failing early - mocks instance and class
methods - mocks final methods and final Collaborators - mocks
Groovy and Java Collaborators (but Caller must be groovy) - can
mock all objects of a given class (or a single Groovy object) -
mocks even if Collaborator cannot be injected into the Caller -
mocks even if Collaborator is not accessible on the Caller (no
getter) - demanded calls specified via recording calls on the
Demand object (EasyMock style). - cardinality specified as
Ranges, default is 1..1; 'optional' can be achieved with -
behavior specified via Closures, allowing st