我有以下代码:
trait Calculator {
def add(x:Int, y:Int):Int
def multiply(x:Int,y: Int):Int
}
trait MyCalculator extends Calculator {
override def add(x: Int, y: Int): Int = x+y //in real live it calls remote service which is not avaialble in test
override def multiply(x: Int, y: Int): Int = x*y //in real live it calls remote service which is not avaialble in test
}
object MyCalculator extends MyCalculator
现在我有计算器服务:
trait CalculatorServiceTrait {
def calculate(x:Int,sign:String,y:Int):Int
}
trait CalculatorService extends CalculatorServiceTrait{
override def calculate(x: Int, sign: String, y: Int): Int = {
sign match{
case "+" => MyCalculator.add(x,y)
case "*" => MyCalculator.multiply(x,y)
case _ => 0
}
}
}
object CalculatorService extends CalculatorService
现在我想使用 Mockito 模拟 MyCalculator 来给我带来错误的结果。
"Calculator Service" should{
"return 0 when 2 and 2 used " in{
val MyCalculatorMock = mock[MyCalculator]
when(MyCalculatorMock.multiply(2,2)).thenReturn(0)
class CalculatorServiceUnderTest extends CalculatorService with MyCalculator
new CalculatorServiceUnderTest with MyCalculator
val c = new CalculatorServiceUnderTest
val result = c.calculate(2,"+",2)
result shouldEqual(0)
}
}
但我仍然得到“4”而不是“0”
有没有办法处理这样的测试用例?
P.S:我可以更改某些类或特征实现,但进行全局重构可能会出现问题