Adds a function or a local variable to RUnit global logger.
addToLogger(name, value, logger = NULL)name of the function or variable to add
object to append to the logger. If
value is a function it is added to the list and is
accessible via .testLogger$name. If value
is a variable it is added to the local environment and is
therefore accessible in all logging functions.
an optional RUnit logger object. If missing
or NULL, the object .testLogger is searched
in .GlobalEnv -- and an error is thrown if it does
not exist.
the modified logger object. Note that the global object
is also modified if logger is NULL.