NullPointerException在模拟的类方法

Question

我目前正在为Buy类的buy方法编写一个测试，该测试应该实际测试是否正确的请求发送到服务器，以及它是否正确处理了响应。

目前，我总是收到java.lang.NullPointerException，因为execute（post）返回null而不是CloseableHttpResponse。

CloseableHttpResponse响应= httpClient.execute（post）;

但是我不明白，因为在测试中，我告诉mockito返回模拟的closeableHttpResponse。

考试

  @Test
    public void testBid() throws IOException {
        //given:
        HttpPost post = mock(HttpPost.class);
        HttpResponse httpResponse = mock(HttpResponse.class);

        StatusLine statusLine = mock(StatusLine.class);

        ObserverImp observer = mock(ObserverImp.class);

        CloseableHttpClient closeableHttpClient = mock(CloseableHttpClient.class);
        CloseableHttpResponse closeableHttpResponse = mock(CloseableHttpResponse.class);
        HttpEntity httpEntity = mock(HttpEntity.class);
        BufferedInputStream inputStream = mock(BufferedInputStream.class);

        //and:
        when(statusLine.getStatusCode()).thenReturn(200);
        when(httpResponse.getStatusLine()).thenReturn(statusLine);
        when(closeableHttpClient.execute(post)).thenReturn(closeableHttpResponse);
        when(closeableHttpResponse.getEntity()).thenReturn(httpEntity);
        when(httpEntity.getContent()).thenReturn(inputStream);
        when(inputStream.read()).thenReturn(1);
        when(observer.getKey()).thenReturn("##213");


        Buy buy = new Buy(observer, closeableHttpClient);
        buy.bid(14455);
    }

以及相关的实现

public class Buy {
    private ObserverImp observer;
    private CloseableHttpClient httpClient;

    public Buy (ObserverImp observer, CloseableHttpClient httpClient) {
       this.observer = observer;
       this.httpClient = httpClient;
    }

    public void buy(double price) {
            String queryArgs = "command=order&amount=1" + "&price=" + String.valueOf(price); // generates query

            HttpPost post = new HttpPost("wwww.hm.edu/projectGroup1");
            post.addHeader("Key", observer.getKey());
            try {
                post.setEntity(new ByteArrayEntity(queryArgs.getBytes("UTF-8")));
            } catch (UnsupportedEncodingException e) {
                System.out.println("Exception in run");
            }
            List<NameValuePair> params = new ArrayList<>();

            params.add(new BasicNameValuePair("command", "order"));
            params.add(new BasicNameValuePair("amount", "1"));
            params.add(new BasicNameValuePair("price", String.valueOf(price)));
            try {
                post.setEntity(new UrlEncodedFormEntity(params));
                CloseableHttpResponse response = httpClient.execute(post);
                HttpEntity entity = response.getEntity();
                Scanner in = new Scanner(entity.getContent());
                String orderNumber = "";
                while (in.hasNext()) {
                    orderNumber = in.nextLine();
                }
                String[] findOrderNumber = orderNumber.split(".");
                long lastOrderNumber = -1;
                try {
                    lastOrderNumber = Long.valueOf(findOrderNumber[3]);
                } catch (NumberFormatException exception) {
                    System.out.println("NumberFormatException");
                } finally {
                    if (lastOrderNumber != -1) {
                        observer.setOrderNumber(lastOrderNumber);
                    }
                }
                in.close();
                EntityUtils.consume(entity);
                httpClient.close();
            } catch (IOException e) {
                System.out.println("Exception occured during process");
            }
        }
}

请帮助我解决该问题。 非常感谢。

Answer 1

您需要：

当（closeableHttpClient.execute（任何（HttpPost.class）））thenReturn（closeableHttpResponse）。

您的代码之前只是等待您在测试中创建的确切帖子（等于）。 但是您的购买方法会产生另一个帖子。 这就是为什么您的execute（post）无法与该类匹配。 any（）解决了

Answer 2

您需要设置返回类型，默认情况下将从模拟返回null。 同样在实现中调用createDefault http对象。