AndroidStudio: when I try to initialize a JSONObject in Unit test class it always outputs null

Question

I am trying to create a unit test for a class that uses json object.

This is the class I

    public JsonDataModel(String name, String tag, String color, double price) throws JSONException {
            this.name = name;
            this.tag = tag;
            this.color = color;
            this.price = price;
            initializeObject();
        }

  

     private void initializeObject() throws JSONException {
            object.put("Name", name);
            object.put("Tag", tag);
            object.put("Color", color);
            object.put("Price", price);
        }

This is the unit test setup:

    private JsonDataModel model;

    @BeforeEach
    void setUp() throws JSONException {
        
        model = new JsonDataModel("testName", "testTag", "testColor", 10);

    }

Once I run the test and setUp() is done, I checked the object inside model and it shows null . The weird thing is that if I try to run the app and look with the debugger at the objects created in JsonDataModel , the json object is generated correctly. It looks like when I try to initialize a JSONObject in the unit file test, it always outputs null . Does anyone have any idea what is the problem?

Answer 1

I think that the problem is with the initializeObject function, it saves some data inside "object", but that "object" came from no where. I don't see it anywhere inside the constructor, as if he's null when he reaches back to the Unit Test.

try to initialize this object before "putting" things inside it.

Answer 2

turns out the problem is that the line testImplementation 'org.json:json:20140107' is missing in build.gradle(app) in the dependencies