### Question:
Operacoes { public static int multiplicacao(int a, int b) { Operacao<Integer, Integer> multiplicacao = (x,y) -> {return x*y;}; return multiplicacao.operar(a,b); }  static int soma(int a, int b); static int subtracao(int a, int b); static int multiplicacao(int a, int b); static int divisao(int a, int b);  }### Answer:
@Test public void multiplicacaoTest() { assertTrue(Operacoes.multiplicacao(10, 15) == 150); assertFalse(Operacoes.multiplicacao(10, 15) == 5); }