Use exact type for objectUnderTest in groovy tests

Intelli-J doesn't know the type of objectUnderTest since it is
assigned in setup function. Thus many IDE features such as as
JavaDocs and error detection of wrong arguments are unavailable.
By setting the exact type, all IDE features are enabled.

Issue-ID: CPS-1621
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I3dabf82ef9d07b3c18f9820fa768344c2eeec1b6
6 files changed