Question

我正在使用Kotlin并尝试在特定方法调用上抛出异常，但总是会出现以下错误

Checked exception is invalid for this method!
Invalid: exceptions.ServiceException

这是测试

val client : IClient = Mockito.spy(Client(Cnf("https://:region.example.com", key)))


@Test(expected = ServiceException::class)
fun test400ResponseFrom() {
    val url = "https://example.com/example/user/v3/user/by-name/JACKAPPLE"

    Mockito.doThrow(ServiceException("Bad Request")).`when`(client).makeRequest(url ,riotkey)
    client.getUserDataByNameAndRegion("jackapple", "BR")
}

基本上getUserDataByNameAndRegion方法将调用makeRequest方法，并且通过此测试，我想验证该方法是否正确处理了存根方法的结果。

原始方法如下所示

@Throws(NotFoundException::class, ServiceException::class)
fun makeRequest(url: String, key : String) : String {
    val con = prepareConnection(url, key)
    val statusCode = con.responseCode
    when {
        (statusCode == 400) -> throw ServiceException("Bad Request")
        (statusCode == 401) -> throw ServiceException("Unauthorized")
        (statusCode == 403) -> throw ServiceException("Forbidden")
        (statusCode == 404) -> throw NotFoundException("Data not Found")
        (statusCode == 415) -> throw ServiceException("Unsupported Media Type")
        (statusCode == 429) -> throw ServiceException("Rate limit exceeded")
        (statusCode == 500) -> throw ServiceException("Internal Server Error")
        (statusCode == 502) -> throw ServiceException("Bad Gateway")
        (statusCode == 503) -> throw ServiceException("Service unavailable")
        (statusCode == 504) -> throw ServiceException("Gateway timeout")
        (statusCode == 200) -> {
            return getStringResponseFromConnection(con)
        }
        else -> {
            throw ServiceException("Respondend with Statuscode ${statusCode}")
        }
    }
}

Answer 1

Kotlin不支持creating methods that throw checked exceptions。您可以在Java中定义makeRequest，也可以更改ServiceException以扩展RuntimeException。

Answer 2

您可以尝试以下想法（取自类似的discussion on github）：

.doAnswer { throw ServiceException("Bad Request") }

Answer 3

您可以使用以下内容：

`when`(someClassMocked.muFunction).thenThrow(SocketException())

Answer 4

就我而言，我使用的是引发检查异常的底层Java客户端。我的Kotlin代码需要处理这些异常的一种变体，因此要测试此代码路径，我可以使用：

whenever(someObject.doesSomething(any()).then {
    throw MyCheckedException("Error")
}

在Kotlin中与Mockito一起抛出异常

4 个答案: