Android 如何模拟kotlin映射函数？

我正在尝试存根kotlin扩展名

.map

：

private fun stubGetUsers(users: List<User>) {
   val genericRawResult = mock<GenericRawResults<User>>()
   whenever(genericRawResult.map { User() }).thenReturn(users)

   usersDao.stub { on { it.queryRaw("", RawRowMapper { _, _ -> User() }) }.doReturn(genericRawResult) }
}

第行：

用于（本项目）

因此，我尝试模拟

\u Collections.kt

class

mapTo

函数：

val destination = arrayListOf<User>()

whenever<List<User>>(genericRawResult.mapTo(destination) { User() }).thenReturn(destination)

为了获得详细错误，我做了以下更改：

genericRawResult.stub { onGeneric { it.mapTo(arrayListOf()) { User() } }.doReturn(arrayListOf()) }
genericRawResult.stub { on { it.map { User() } }.doReturn(users) }

这就是我得到的错误：

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
ArrayList cannot be returned by iterator()
iterator() should return Iterator
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. This exception *might* occur in wrongly written multi-threaded tests.
   Please refer to Mockito FAQ on limitations of concurrency testing.
2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - 
   - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.

---

GenericRawResults

是接口还是扩展了集合类型？您可能应该将其建模为一个接口，并拥有一个委托给集合的实现，在这种情况下，模拟

GenericRawResults.map

将非常简单。是的，它是一个来自ORM库的接口：此接口实现另一个Java接口：

Iterable

，这就是为什么我可以访问Kotlin的

Collection

map函数。看看是否可以将依赖于

GenericRawResults

的代码更改为依赖于

Iterable

，相反，你可以更轻松地模拟

Iterable

。

GenericRawResults

是一个接口，还是它扩展了一个集合类型？您可能应该将其建模为一个接口，并拥有一个委托给集合的实现，在这种情况下，模拟

GenericRawResults.map

将非常简单。是的，它是一个来自ORM库的接口：此接口实现另一个Java接口：

Iterable

，这就是为什么我可以访问Kotlin的

Collection

map函数。看看是否可以将依赖于

GenericRawResults

的代码更改为依赖于

Iterable

，相反，你将更容易模拟

Iterable

。

genericRawResult.stub { onGeneric { it.mapTo(arrayListOf()) { User() } }.doReturn(arrayListOf()) }
genericRawResult.stub { on { it.map { User() } }.doReturn(users) }

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
ArrayList cannot be returned by iterator()
iterator() should return Iterator
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. This exception *might* occur in wrongly written multi-threaded tests.
   Please refer to Mockito FAQ on limitations of concurrency testing.
2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - 
   - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.