testGroupByClosureWhereItemsHaveSingleGroupPreservingKeys() testGroupByClosureWhereItemsHaveSingleGroupPreservingKeys()
testGroupByClosureWhereItemsHaveMultipleGroupsPreservingKeys() testGroupByClosureWhereItemsHaveMultipleGroupsPreservingKeys()
testRandomThrowsAnExceptionUsingAmountBiggerThanCollectionSize() testRandomThrowsAnExceptionUsingAmountBiggerThanCollectionSize()
testItThrowsExceptionWhenTryingToAccessNoProxyProperty() testItThrowsExceptionWhenTryingToAccessNoProxyProperty()