JSON test data in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of parsing this JSON string in Java?

Given the following JSON string and Java code snippet using org.json library, what will be the output printed?

Selenium Java

String jsonString = "{\"name\": \"Alice\", \"age\": 30, \"active\": true}";
JSONObject obj = new JSONObject(jsonString);
System.out.println(obj.getString("name") + ", " + obj.getInt("age") + ", " + obj.getBoolean("active"));

A Alice, 30, true

B Alice, 30, false

C 30, Alice, true

D Throws JSONException

💡 Hint

Remember to match the JSON keys with the correct getter methods.

The JSON string contains keys 'name', 'age', and 'active' with values 'Alice', 30, and true respectively. The code correctly retrieves these values and prints them in order.

❓ assertion

intermediate

Which assertion correctly verifies the 'status' field in JSON response?

You receive a JSON response: {"status":"success","code":200}. Which JUnit assertion correctly checks that the 'status' field equals 'success'?

A assertFalse(jsonObject.getBoolean("status"));

B assertTrue(jsonObject.getInt("status") == 200);

C assertEquals("success", jsonObject.getString("status"));

D assertNull(jsonObject.getString("status"));

💡 Hint

Check the data type of the 'status' field in JSON.

The 'status' field is a string with value 'success'. Option C correctly asserts this. Other options either use wrong data types or wrong assertions.

❓ locator

advanced

Identify the best locator to find a JSON data-driven test element

You have a web page that dynamically loads test data from JSON into elements with data-test-id attributes. Which Selenium locator is best to find the element with data-test-id='user-123'?

A By.id("user-123")

B By.xpath("//div[@data-test-id='user-123']")

C By.className("user-123")

D By.cssSelector("[data-test-id='user-123']")

💡 Hint

Use attribute selectors for custom data attributes.

The best locator uses CSS selector for the attribute data-test-id with value 'user-123'. Option D works but is less efficient. Options A and D do not match the attribute.

🔧 Debug

advanced

Why does this JSON parsing code throw an exception?

Consider this Java code snippet: String jsonString = "{\"id\": 101, \"name\": null}"; JSONObject obj = new JSONObject(jsonString); String name = obj.getString("name"); Why does obj.getString("name") throw an exception?

Selenium Java

String jsonString = "{\"id\": 101, \"name\": null}";
JSONObject obj = new JSONObject(jsonString);
String name = obj.getString("name");

A Because the 'name' key has a null value, getString throws JSONException

B Because getString cannot be used with integers

C Because jsonString is not valid JSON

D Because 'name' key is missing in JSON

💡 Hint

Check how org.json handles null values in JSON objects.

The 'name' key exists but its value is null. org.json's getString method throws JSONException if the value is null. To avoid this, use optString or check for null.

❓ framework

expert

How to integrate JSON test data with Selenium tests in Java?

Which approach best integrates external JSON test data into Selenium Java tests for data-driven testing?

A Hardcode JSON strings inside Selenium test methods and parse inline

B Read JSON file using Jackson or Gson, parse into POJOs, then use TestNG DataProvider to supply test data

C Use Selenium WebDriver to fetch JSON from web page and parse it during test execution

D Convert JSON to XML manually and use XML parsers for test data

💡 Hint

Consider maintainability and separation of test data from test code.

Option B is best practice: external JSON files parsed by libraries like Jackson or Gson, then used with TestNG DataProvider for clean, maintainable data-driven tests. Other options are inefficient or error-prone.