###Personal sandbox

1. Test for output stream:

   For testing functionality of a function with side effect we can use spy or mock to access the changes that are applying to system. Thus, it is necessary to use composition for accessing those methods(output stream)

   See Printer.scala and PrinterSpecs.scala

2. Test for calculating the area of a triangle:

   As dots of a triangle are global properties with a wide range of inputs, the best solution for testing is property testing

   See Triangle.scala and TriangleSpecs.scala

3. The third item

   It had done with standard Scala API for reading file

   See LeagueRanking.scala and LeagueRankingSpecs.scala