done all unit tests

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

src/main/java/at/ionas999/health/model/Patient.java

@@ -1,4 +1,44 @@
 package at.ionas999.health.model;
 
-public class Patient {
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class Patient implements Comparable<Patient> {
+    private String name;
+    private LocalDateTime appointment;
+    private boolean isEmergency;
+
+    public Patient(String name, LocalDateTime appointment, boolean isEmergency) {
+        this.name = name;
+        this.appointment = appointment;
+        this.isEmergency = isEmergency;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public LocalDateTime getAppointment() {
+        return appointment;
+    }
+
+    public boolean isEmergency() {
+        return isEmergency;
+    }
+
+    @Override
+    public int compareTo(Patient o) {
+        if (this.isEmergency && !o.isEmergency) {
+            return -1;
+        } else if (!this.isEmergency && o.isEmergency) {
+            return 1;
+        } else {
+            return this.appointment.compareTo(o.appointment);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return (isEmergency ? "EMERGENCY" : appointment.format(DateTimeFormatter.ofPattern("d.M.yy HH:mm"))) + " "  + name;
+    }
 }

src/main/java/at/ionas999/health/model/WaitingRoom.java

@@ -1,4 +1,52 @@
 package at.ionas999.health.model;
 
+import at.ionas999.observer.ChangeObserver;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.PriorityQueue;
+
 public class WaitingRoom {
+    private final List<ChangeObserver<WaitingRoom>> observers = new ArrayList<>();
+    private final PriorityQueue<Patient> patients = new PriorityQueue<>();
+    private Patient patientUndergoingTreatment = null;
+
+    public int getPatientCount() {
+        return patients.size();
+    }
+
+    public Patient getPatientInPreparation(){
+        return patients.peek();
+    }
+
+    public Patient getPatientUndergoingTreatment(){
+        return this.patientUndergoingTreatment;
+    }
+
+    public void addObserver(ChangeObserver<WaitingRoom> observer) {
+        observers.add(observer);
+        observer.update(this);
+    }
+
+    public void removeObserver(ChangeObserver<WaitingRoom> observer) {
+        observers.remove(observer);
+    }
+
+    public void addPatient(String name, LocalDateTime appointment, boolean isEmergency) {
+        Patient patient = new Patient(name, appointment, isEmergency);
+        patients.add(patient);
+        notifyObservers();
+    }
+
+    public void treatNextPatient() {
+        this.patientUndergoingTreatment = patients.poll();
+        notifyObservers();
+    }
+
+    private void notifyObservers() {
+        for (ChangeObserver<WaitingRoom> observer : observers) {
+            observer.update(this);
+        }
+    }
 }

src/main/java/at/ionas999/observer/ChangeObserver.java

@@ -1,4 +1,4 @@
-package at.htlleonding.observer;
+package at.ionas999.observer;
 
 @FunctionalInterface
 public interface ChangeObserver<T> {

src/test/at/ionas999/health/model/UpdateObserver.java

@@ -1,6 +1,7 @@
 package at.ionas999.health.model;
 
-import at.htlleonding.observer.ChangeObserver;
+
+import at.ionas999.observer.ChangeObserver;
 
 public class UpdateObserver implements ChangeObserver<WaitingRoom> {
     private int updateCount;

src/test/at/ionas999/health/model/WaitingRoomTest.java

@@ -1,6 +1,6 @@
 package at.ionas999.health.model;
 
-import at.htlleonding.observer.ChangeObserver;
+import at.ionas999.observer.ChangeObserver;
 import org.junit.jupiter.api.Test;
 
 
@@ -13,16 +13,16 @@ import static org.junit.jupiter.api.Assertions.*;
 
 class WaitingRoomTest {
     private List<Patient> createPatients() {
-        Patient patientOtto = new at.htlleonding.health.model.Patient("Otto Normalverbraucher", LocalDateTime.of(2022, 3, 14, 12, 00), true);
-        Patient patientTom = new at.htlleonding.health.model.Patient("Tom Taxpayer", LocalDateTime.of(2022, 3, 14, 12, 20), true);
-        Patient patientRichard = new at.htlleonding.health.model.Patient("Richard Roe", LocalDateTime.of(2022, 3, 14, 13, 00), true);
-        Patient patientLieschen = new at.htlleonding.health.model.Patient("Lieschen Müller", LocalDateTime.of(2023, 3, 14, 12, 00), true);
-        Patient patientJan = new at.htlleonding.health.model.Patient("Jan Kowalski", LocalDateTime.of(2022, 3, 14, 12, 15), false);
-        Patient patientJohn = new at.htlleonding.health.model.Patient("John Doe", LocalDateTime.of(2022, 3, 14, 12, 30), false);
-        Patient patientMax = new at.htlleonding.health.model.Patient("Max Mustermann", LocalDateTime.of(2022, 3, 14, 13, 00), false);
-        Patient patientSally = new at.htlleonding.health.model.Patient("Sally Sixpack", LocalDateTime.of(2022, 3, 15, 12, 00), false);
+        Patient patientOtto = new at.ionas999.health.model.Patient("Otto Normalverbraucher", LocalDateTime.of(2022, 3, 14, 12, 00), true);
+        Patient patientTom = new at.ionas999.health.model.Patient("Tom Taxpayer", LocalDateTime.of(2022, 3, 14, 12, 20), true);
+        Patient patientRichard = new at.ionas999.health.model.Patient("Richard Roe", LocalDateTime.of(2022, 3, 14, 13, 00), true);
+        Patient patientLieschen = new at.ionas999.health.model.Patient("Lieschen Müller", LocalDateTime.of(2023, 3, 14, 12, 00), true);
+        Patient patientJan = new at.ionas999.health.model.Patient("Jan Kowalski", LocalDateTime.of(2022, 3, 14, 12, 15), false);
+        Patient patientJohn = new at.ionas999.health.model.Patient("John Doe", LocalDateTime.of(2022, 3, 14, 12, 30), false);
+        Patient patientMax = new at.ionas999.health.model.Patient("Max Mustermann", LocalDateTime.of(2022, 3, 14, 13, 00), false);
+        Patient patientSally = new at.ionas999.health.model.Patient("Sally Sixpack", LocalDateTime.of(2022, 3, 15, 12, 00), false);
 
-        List<at.htlleonding.health.model.Patient> result = new LinkedList<>();
+        List<at.ionas999.health.model.Patient> result = new LinkedList<>();
         result.add(patientOtto);
         result.add(patientTom);
         result.add(patientRichard);