如何模拟DynamoDBmapper扫描

Question

我有以下我要模拟的代码：

public void getOrders(Response response){
    logger.log("Getting all orders");
    DynamoDBScanExpression scanExpression = new DynamoDBScanExpression()
            .withProjectionExpression("OrderId");
    PaginatedScanList<Orders> orders = dynamoDBMapper.scan(Orders.class, scanExpression);
    response.setData(orders..stream()
            .collect(Collectors.toList()));
}

我想模拟的方式是：

Mockito.when(mockDynamoDBMapper.scan(Orders.class, 
             Mockito.any())).thenReturn(mockPaginatedList);

我得到以下例外：

如果将匹配器与原始值结合在一起，则可能发生此例外： //不正确： somemethod(AnyObject((，" RAW String"(;使用匹配项时，所有参数都必须由匹配者提供。例如： //正确的： someMethod(AnyObject((，eq(" a string by Matcher"((; 有关更多信息，请参见Matchers类的Javadoc。

如何使用任何DynamoDBScanExpression对象模拟dbmapper.scan方法？

Answer 1

错误对您的问题有明确的答案。您想要的是：

Mockito.when(mockDynamoDBMapper.scan(eq(Orders.class), 
             Mockito.any())).thenReturn(mockPaginatedList);

必须向匹配器提供匹配器-EQ(orders.class(，而不是原始值-Class.Class

Answer 2

通常，我要做的是首先模拟PaginedScanlist，这是mapper.scan((给我们的响应类型，然后我将响应模拟分配给了它创建的模拟扫描((称为

时的映射器

    // here I define the values ​​that will be assigned to the filter
    Map <String, AttributeValue> expressionAttributeValues ​​= new HashMap <> ();
    expressionAttributeValues.put (": attributeValue", new AttributeValue (). withS ("value"));
    // the definition of the epxpression for the scan
    DynamoDBScanExpression scanExpression = new DynamoDBScanExpression ();
    scanExpression.setLimit (1); // amount of data to return
    scanExpression.setFilterExpression (("email =: attributeValue")); // the attribute to filter by
    scanExpression.setProjectionExpression ("id"); // the data to return from the row or json
    scanExpression.setExpressionAttributeValues ​​(expressionAttributeValues); // place the value by which to filter
    DynamoDBMapper mapper = mock (DynamoDBMapper.class); // The mock was created for the mapper, which is the one with different methods such as query, scan, etc.
    PaginatedScanList scanResultPage = mock (PaginatedScanList.class); // definition of the mock for the scan result
    when (scanResultPage.size ()). then (invocation -> 3); // what to return when the PaginatedScanList is called
    when (mapper.scan (Person.class, scanExpression)). then (invocation -> scanResultPage); // here returns our mocked PaginatedScanList for the scan function