scala - Scalamock：如何获得代理模拟的“期望”？

Question

我将 Scalamock 与 ScalaTest 一起使用，并试图模拟 Java 接口。我目前有：

private val _iface = mock [MyInterface]

现在我想做

_iface expects `someMethod returning "foo" once

但编译器没有找到expects.

我导入org.scalatest._和org.scalamock.scalatest._. 我还缺少什么？

Answer 1

First of all, proxy mocks are not supported very well in ScalaMock 3, and I think they will be completely removed in ScalaMock 4. Do you really need to use proxy mocks instead macro mocks?

This should work:

package example

import org.scalatest.FlatSpec
import org.scalatest.Matchers
import org.scalamock.scalatest.proxy.MockFactory

trait MyInterface {
    def someMethod : String
}

class MyTest extends FlatSpec with Matchers with MockFactory {
  "MyInterface" should "work" in {
    val m = mock[MyInterface]
    m.expects('someMethod)().returning("foo")
    m.someMethod shouldBe "foo"
  }
}

If not, please check ScalaMock proxy mocks unit tests for more examples.

Answer 2

我使用scalaMockversion 4.1.0，这对我有用：

对于某些特征：

trait MyInterface { def someMethod(n1: Int, n2: Int) }

这应该投入测试

val myInterfaceMock = mock[MyInterface]

myInterfaceMock.someMethod _ expects (1,2)

更多阅读：scalaMock Guide，你会在那里找到一些例子

Answer 3

我认为它应该更像是：

import org.scalamock.scalatest.MockFactory

class MyTest extends FlatSpec with Matchers with MockFactory {
  "MyInterface" should "work" in {
    val m = mock[MyInterface]
    (m.someMethod _).expects().returning("foo")
    m.someMethod shouldBe "foo"
  }
}

我认为期望 arg 期望 arg 到函数