import Calculator from '../src/Calculator' ; describe ( 'calculate' , function ( ) { it ( 'add' , function ( ) { let result = Calculator . Sum ( 5 , 2 ) ; expect ( result ) . toBe ( 7 ) ; } ) ; it ( 'substract' , function ( ) { let result = Calculator . Difference ( 5 , 2 ) ; expect ( result ) . toBe ( 3 ) ; } ) ; } ) ;