Pragmatic Unit Testing in Java with JUnit, 3rd Edition

A Testing Challenge

You’re testing an AddressRetriever. Given a latitude and longitude, its retrieve method returns an appropriately populated Address object.

utj3-mock-objects/01/src/main/java/com/langrsoft/domain/AddressRetriever.java

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.langrsoft.util.HttpImpl;

public class AddressRetriever {
    private static final String SERVER =
       "https://nominatim.openstreetmap.org";

    public Address retrieve(double latitude, double longitude) {
        var locationParams =
           "lon=%.6f&lat=%.6f".formatted(latitude, longitude);