improve test coverage
improve test coverage

o 'createInPlace' on a Variant that is set (i.e., '!isUnset()')
o Negative Testing of the 'the' methods (accessor and manipulator)

bloomberg/bde,che2/bde,bloomberg/bde,bloomberg/bde,bloomberg/bde,bloomberg/bde,che2/bde,che2/bde,che2/bde