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public class ResourceHandlerTest extends TestCase {

    FhirContext ctx = null;
    IParser parser = null;

    // Other methods...

    public String getId(Resource resource) {
        if (resource.getIdElement() != null) {
            // Use IdType to extract the ID without additional details such as base URL or resource type.
            IdType idType = resource.getIdElement();
            return idType.getIdPart();
        } else {
            // Handle the case where the resource does not have an ID.
            return null; // Or throw an exception, depending on your requirements.
        }
    }

    public Observation setObservationCode(Observation observation, Coding coding) {
        if (observation.getCode() == null) {
            observation.setCode(new CodeableConcept().addCoding(coding));
        } else {
            observation.getCode().addCoding(coding);
        }
        return observation;
    }

    
public Observation setObservationCode(Observation observation, Coding coding) {
            if (observation.getCode() == null) {
                observation.setCode(new CodeableConcept().addCoding(coding));
            } else {
                observation.getCode().addCoding(coding);
            }
            return observation;
        }
    
      public Observation setObservationCode(Observation observation, String system, String code, String display) {
            System.out.println("Debug: Observation Before - " + observation);
    
            System.out.println("Debug: System - " + system);
            System.out.println("Debug: Code - " + code);
            System.out.println("Debug: Display - " + display);
    
            Coding coding = new Coding().setSystem(system).setCode(code).setDisplay(display);
    
            return setObservationCode(observation, coding);
        }

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    public void testSetObservationCode() throws Exception {
            if (ctx == null) ctx = FhirContext.forR4();
            if (parser == null) parser = ctx.newJsonParser();
    
            String observationJsonFile = "src/resources/observation.json";
            String observationJson = "";
            try {
                observationJson = new String(Files.readAllBytes(Paths.get(observationJsonFile)));
            }
            catch (Exception e) { System.err.println("Failed to read observation.json file."); }
    
            Observation correctObservation = parser.parseResource(Observation.class, observationJson);
    
            ResourceHandler studentResourceHandler = new ResourceHandler();
    
            String expectedSystem = "http://example.com/system";
            String expectedCode = "12345";
            String expectedDisplay = "Test Code";
    
            Coding coding = new Coding().setSystem(expectedSystem).setCode(expectedCode).setDisplay(expectedDisplay);
            Observation modifiedObservation = studentResourceHandler.setObservationCode(correctObservation, coding);
    
            assertEquals(expectedSystem, modifiedObservation.getCode().getCodingFirstRep().getSystem());
            assertEquals(expectedCode, modifiedObservation.getCode().getCodingFirstRep().getCode());
            assertEquals(expectedDisplay, modifiedObservation.getCode().getCodingFirstRep().getDisplay());
    
        }

Observation modifiedObservation = studentResourceHandler.setObservationCode(correctObservation, coding);