Merge pull request #48 from BME-MIT-IET/subject_unit_test_david

subject test

src/main/java/virologist/model/Subject.java

@@ -2,6 +2,7 @@
 
 import virologist.view.Observer;
 import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Egy megfigyelt osztály, melynek változásaira fel lehet iratkozniuk Observereknek
@@ -10,7 +11,15 @@ public class Subject {
     /**
      * Observerek - megfigyelők listája
      */
-    ArrayList<Observer> observers = new ArrayList<>();
+    List<Observer> observers;
+
+    public Subject() {
+        observers = new ArrayList<>();
+    }
+
+    public Subject(List<Observer> observers) {
+        this.observers = observers;
+    }
 
     /**
      * Egy megfigyelő regisztrálása

src/test/java/virologist/model/SubjectTest.java

@@ -0,0 +1,84 @@
+package virologist.model;
+
+import java.util.List;
+import org.junit.jupiter.api.BeforeEach;
+import virologist.view.Observer;
+import org.junit.jupiter.api.Test;
+import static org.mockito.Mockito.*;
+import java.util.ArrayList;
+
+class SubjectTest {
+    private Subject subject;
+    List<Observer> observers;
+    Observer observer1;
+    Observer observer2;
+    Observer observer3;
+
+    @BeforeEach
+    public void init() {
+        observer1 = mock(Observer.class);
+        observer2 = mock(Observer.class);
+        observer3 = mock(Observer.class);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    void attachTest_not_contained() {
+        // Arrange
+        observers = mock(ArrayList.class);
+        when(observers.contains(observer1)).thenReturn(false);
+        subject = new Subject(observers);
+
+        // Act
+        subject.attach(observer1);
+
+        // Assert
+        verify(observers, times(1)).add(observer1);
+    }  
+
+    @SuppressWarnings("unchecked")
+    @Test
+    void attachTest_already_contained() {
+        // Arrange
+        observers = mock(ArrayList.class);
+        when(observers.contains(observer1)).thenReturn(true);
+        subject = new Subject(observers);
+
+        // Act
+        subject.attach(observer1);
+
+        // Assert
+        verify(observers, times(0)).add(observer1);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Test
+    void detachTest() {
+        // Arrange
+        observers = mock(ArrayList.class);
+        subject = new Subject(observers);
+
+        // Act
+        subject.detach(observer1);
+
+        // Assert
+        verify(observers, times(1)).remove(observer1);
+    }
+
+    @Test
+    void notifyAllObserversTest() {
+        // Arrange
+        observers = new ArrayList<>();
+        observers.add(observer1);
+        observers.add(observer2);
+        subject = new Subject(observers);
+
+        // Act
+        subject.notifyAllObservers();
+
+        // Assert
+        verify(observer1, times(1)).update();
+        verify(observer2, times(1)).update();
+        verify(observer3, times(0)).update();
+    }
+}