public void TestCalculateWater3Tenant()
 {
     Assert.AreEqual(Expenses.CalculateWater(flat3), 1200);
 }
 public void TestCalculateWater1TenantWrong()
 {
     Assert.AreNotEqual(Expenses.CalculateWater(flat4), 101);
 }
 public void TestCalculateWater1Tenant()
 {
     Assert.AreEqual(Expenses.CalculateWater(flat4), 400);
 }