The curious case of Pathum Nissanka

It’s not certain what plans the selectors have got for Nissanka. Do they consider the shorter formats as inferior to Tests and expect Nissanka to graduate to the Test level by playing the shorter formats for a few years? If that’s the case, how did Kamindu Mendis and Nishan Madushka leapfrog him into the Test side? Or else, do they see Nissanka as a white-ball specialist, who does not yet have the skill set to succeed in Tests?