Check Map key/values with jsonPath

Question

I'm testing a controller that returns a Map

@RequestMapping("/")
@ResponseBody
public Map<String, String> getMessages(@RequestBody String foo) {
    Map<String, String> map = boo.getMap(foo);
    return map;
}

Test:

...
resultActions
        .andDo(print())
        .andExpect(status().isOk())
        .andExpect(
                content().contentTypeCompatibleWith(
                        MediaType.APPLICATION_JSON))
        .andExpect(jsonPath("$", notNullValue()))
        .andExpect(jsonPath(EXPRESSION, equalsTo(foo));
 ...

Which expression should I use to read the key and the value from the Map?

Edit: A way around to solve it could be:

MvcResult result = resultActions.andReturn();
MockHttpServletResponse response = result.getResponse();
String content = response.getContentAsString();
Gson gson = new Gson();
Type typeOfT = new TypeToken<Map>() {
}.getType();
Map<String, String> map = gson.fromJson(content, typeOfT);

And then loop through the map checking the values. But is there a way to do it with jsonPath?

Solution

If you're using hamcrest Matchers that's pretty easy. There are two methods to get your hands on either key or value of the map entry.

• Matchers.hasKey()

• Matchers.hasValue()

And a simple example to check if all keys are present in the resulting Map. $.translationProperties directly points to the map.

 ResultActions resultActions = mvc.perform(...);
 List<String> languagesToBePresent = new ArrayList<>(); //add some values here

 for (String language : languagesToBePresent) {
            resultActions.andExpect(
                  jsonPath("$.translationProperties", Matchers.hasKey(language)));
        }