我在模拟服务中有一种方法，
def whenDynamoDBActionBlacklist(newlist: List[String]) = {
doReturn(newlist).when(service).Blacklist
}
并希望通过使用进行测试
val list = mocks.whenDynamoDBActionBlacklist(List("333:avd"))
但我无法获取值，获取了nullPointerException，有人可以帮助我吗？谢谢。
我相信您会混淆模拟设置和模拟执行之间的区别。whenDynamoDBActionBlacklist实际上并不会返回值，而是只为存根方法指定响应。考虑下面的例子
import org.mockito.{ArgumentMatchersSugar, IdiomaticMockito}
import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers
class MockitoScalaExampleSpec extends AnyFlatSpec with Matchers with IdiomaticMockito with ArgumentMatchersSugar {
"MockitoScalaExample" should "demonstrated difference between mock setup and mock execution" in {
// system under test
trait MyService {
def blacklist: List[String]
}
// initialise mock of the system under test
val serviceMock = mock[MyService]
// specify behaviour of the mock by defining how should stubbed methods respond
serviceMock.blacklist returns List("mocked!")
// actually execute the mocked system under test
val result = serviceMock.blacklist
// assert on the result
result should be(List("mocked!"))
}
}
关键是要了解
serviceMock.blacklist returns List("mocked!")
尚未返回，List("mocked!")但声明一旦调用将发生什么aMock.blacklist。
请注意，该示例使用了Mockito-scala，但是在香草Mockito中也应用了相同的概念。
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我来说两句