Ensure LocateFile.getDescription() results in correct message in all possible use cases

[fabiocarvalho777]

Make sure LocateFile.getDescription() results in correct description, according to the two possible use cases, as shown below.

Direction	Usage	Expected description
Forward	add(new LocateFile().relative("/src/main/resources");	Locate file "/src/main/resources"
Backward	add(new LocateFile(3).absolute(ATT);	Locate file 3 parent levels of "/src/main/resources"

In the Backward example above, assume ATT refers to "/src/main/resources". Make sure there are unit tests covering all these use cases.