java – 带有junit样式差异的Hamcrest Matcher

2023年9月1日 176次阅读

我正在使用Hamcrest Matcher来比较两个
JSON对象.比较方法使用Gson解析器.

匹配器工作得很好但是当两个JSON不相同时,我只能显示如下消息：

Expected: <[{"data":"data1","application":{"id":"1"}}]>
     but: <[{"data":"data1","application":{"id":"2"}}]>

这不是很有帮助,我想显示哪些元素不匹配,类似于junit的assertEquals：

expected:<...a1","application":{"[filtered":false,"id":"1"]...> but was:<...a1","application":{"[id":"2"...>

有没有办法实现这一目标？

编辑：

@Override
protected void describeMismatchSafely(JsonElement item, 
                                      Description mismatchDescription) {
    //mismatchDescription.appendValue(item);
    assertEquals(item.toString(), originalJson.toString());
}

但这会给我：

expected:<...a1","application":{"[filtered":false,"id":"2"]...> 
but  was:<...a1","application":{"[id":"1","filtered":false],...>

请注意,唯一的区别在于“id：1”和“id：2”,但junit在JSON中也显示了不同的排序,作为错误的一部分.

最佳答案 我到目前为止能做的最好：

@Override
protected void describeMismatchSafely(JsonElement expectedJson, 
                                      Description mismatchDescription) {

  mismatchDescription.appendValue(expectedJson).appendText("\ndifference:\n");

  try {
     assertEquals(expectedJson.toString(), originalJson.toString());
  }
  catch (ComparisonFailure e) {
     String message = e.getMessage();
     message = message.replace("expected:", "");
     message = message.replace("but was:", "");
     message = message.replaceFirst(">", ">\n");
     mismatchDescription.appendText(message);
  }
}

这给了我

Expected: <[{"data":"data1","application":{"id":"1"}}]>
     but: <[{"data":"data1","application":{"id":"2"}}]>
difference:
<...a1","application":{"[filtered":false,"id":"2"],...>
<...a1","application":{"[id":"1","filtered":false],...>
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