is.dummy: Test if a path or handle is a 'dummy' whose only purpose is to allow
tests to run.
Description
When any of the functions in the package are called, if this returns
'true' on their first argument, no actual Simile interaction will be
attempted but some sample output may be returned.
Usage
is.dummy(path.or.handle)
Value
A boolean which is true in the case of a dummy argument.
Arguments
path.or.handle
The file path or handle which is being tested for dummy-ness.