如何模拟包装在JAXBElement中的对象

Question

考虑一下JAXB生成的以下代码：

public class CnpOnlineResponse {

    protected JAXBElement<? extends TransactionTypeWithReportGroup> transactionResponse;

    public JAXBElement<? extends TransactionTypeWithReportGroup> getTransactionResponse() {
        return transactionResponse;
    }

    public void setTransactionResponse(JAXBElement<? extends TransactionTypeWithReportGroup> value) {
        this.transactionResponse = value;
    }
}

public class AuthorizationResponse extends TransactionTypeWithReportGroup {

}

public class ObjectFactory {

    public JAXBElement<AuthorizationResponse> createAuthorizationResponse(AuthorizationResponse value) {
        return new JAXBElement<AuthorizationResponse>(_AuthorizationResponse_QNAME, AuthorizationResponse.class, null, value);
    }
}

我正在编写一个测试，其中我同时模拟了CnpOnlineResponse和AuthorizationResponse：

@Mock private CnpOnlineResponse mockCnpOnlineResponse;
@Mock private AuthorizationResponse mockAuthorizationResponse;

final JAXBElement<AuthorizationResponse> authorization = CnpContext.getObjectFactory().createAuthorizationResponse(mockAuthorizationResponse);

when(mockCnpOnlineResponse.getTransactionResponse()).thenReturn(authorization); // <= ERROR here

但是我收到以下编译错误：

The method thenReturn(JAXBElement<capture#1-of ? extends TransactionTypeWithReportGroup>) in the type OngoingStubbing<JAXBElement<capture#1-of ? extends TransactionTypeWithReportGroup>> is not applicable for the arguments (JAXBElement<AuthorizationResponse>)

任何帮助表示赞赏，我不明白为什么它认为没有将thenReturn传递给所需类型的对象。

Answer 1

似乎混淆了类型推断。

使用thenAnswer （或短then ）。

when(mockCnpOnlineResponse.getTransactionResponse()).then(i -> authorization);

i -> authorization是评估为Answer<? extends TransactionTypeWithReportGroup>的lambda表达式Answer<? extends TransactionTypeWithReportGroup> Answer<? extends TransactionTypeWithReportGroup>使其能够匹配的捕获。