Ruslan (and everybody else),
When adding some tests to the core to enable testing some link search
issues that clkao contributed a test suite for, Schwern and Autrijus
suckered me into refactoring RT’s test suite to use “prove” as a test
harness, rather than our hand-rolled harness. So now you get much nicer
test suite output and you can run many of the test files on their own.
Patches appreciated 
The changes should be in 3.3.16, which I should be releasing on Tuesday.
Jesse