Compare JSON response using JUnit and JSONassert

Question

I'm relatively new to Java and I'm asking to write test of JSON response server. I found JSONassert very useful but I didn't succeed to write the method getRESTData.

Anybody can help please?

@Test
public void testGetFriends() throws JSONException {
    JSONObject data =  getRESTData("/friends/367.json");
    String expected = "{friends:[{id:123,name:\"Corby Page\"}"
            + ",{id:456,name:\"Solomon Duskis\"}]}";
    JSONAssert.assertEquals(expected, data, false);
}

Solution 1

You can get the data as String and pass it into JSONAssert.assertEquals. Converting to JSONObject isn't necessary.

To fetch data from an URL, you can use URL.getContent method:

final String data = new URL("...").getContent();
String expected = "{friends:[{id:123,name:\"Corby Page\"}"
        + ",{id:456,name:\"Solomon Duskis\"}]}";
JSONAssert.assertEquals(expected, data, false);

Solution 2

This can also be achieved with ModelAssert - https://github.com/webcompere/model-assert , which can take anything serializable to JSON as an input:

@Test
public void testGetFriends() throws JSONException {
    JSONObject data =  getRESTData("/friends/367.json");
    String expected = "{friends:[{id:123,name:\"Corby Page\"}"
            + ",{id:456,name:\"Solomon Duskis\"}]}";
    
    assertJson(data).isEqualTo(expected);
}

IIRC JSONObject is essentially a Map, so assertJson will convert it to the internal JsonNode format it uses for comparison.