[英]Unit test for Kotlin lambda callback
假设我们有以下功能要测试
fun loadData(dataId: Long, completion: (JsonElement?, Exception?) -> Unit) {
underlayingApi.post(url = "some/rest/url",
completion = { rawResult, exception ->
val processedResult = processJson(rawResult)
completion(processedResult, exception)
})
}
我很清楚如何模拟,注入,存根和验证对underlayingApi
的调用。
如何验证通过 completion(processedResult, exception)
返回的结果 completion(processedResult, exception)
?
要测试的lambda行为,所述underlayingApi
具有其中的λ是通过调用以被模拟InvoactionOnMock
这样的对象。
`when`(underlayingApi.post(eq("some/rest/url"),
any())).thenAnswer {
val argument = it.arguments[1]
val completion = argument as ((rawResult: String?, exception: Exception?) -> Unit)
completion.invoke("result", null)
}
这导致在被测对象内调用回调。 现在检查被测对象的回调是否正常工作验证它是否正常。
objUnderTest.loadData(id,
{ json, exception ->
assert....
})
基于Martin的回答,这是我没有lint警告的方法:
import com.nhaarman.mockito_kotlin.*
@Test
fun loadData() {
val mockUnderlyingApi: UnderlayingApi = mock()
val underTest = ClassBeingTested()
underTest.underlayingApi = mockUnderlyingApi
whenever(mockUnderlyingApi.post(eq("some/rest/url"), any())).thenAnswer {
val completion = it.getArgument<((rawResult: String?, exception: Exception?) -> Unit)>(1)
completion.invoke("result", null)
}
underTest.loadData(0L,
{ jsonElement, exception ->
// Check whatever you need to check
// on jsonElement an/or exception
})
}
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