1 files changed, 65 insertions, 0 deletions
diff --git a/src/test/model/GroupObserverTest.java b/src/test/model/GroupObserverTest.java
new file mode 100644
index 0000000..618f0eb
--- /dev/null
+++ b/src/test/model/GroupObserverTest.java
@@ -0,0 +1,65 @@
+package model;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GroupObserverTest {
+    private GroupObserver target;
+
+    private MockObserver<Integer> obsInt;
+    private MockObserver<String> obsStr;
+
+    private MockObserver<Observer> obsObs;
+
+    private MockObserver<ArrayList> obsArrList;
+
+    private MockObserver<List> obsList;
+
+    @BeforeEach
+    void setup() {
+        target = new GroupObserver();
+        obsInt = new MockObserver<>();
+        obsStr = new MockObserver<>();
+        obsObs = new MockObserver<>();
+        obsArrList = new MockObserver<>();
+        obsList = new MockObserver<>();
+        target.register(Integer.class, obsInt);
+        target.register(String.class, obsStr);
+        target.register(Observer.class, obsObs);
+        target.register(List.class, obsList);
+        target.register(ArrayList.class, obsArrList);
+    }
+
+    @Test
+    void testRegister() {
+        assertEquals(5, target.getRegisteredObserverCount());
+    }
+
+    @Test
+    void testAccept() {
+        target.accept(this, Observer.DIRECTION_CHANGE, 100);
+        assertEquals(0, obsInt.getCount());
+        assertEquals(0, obsStr.getCount());
+
+        target.accept("123", Observer.DIRECTION_CHANGE, 1000);
+        obsStr.assertCalled(Observer.DIRECTION_CHANGE);
+        assertEquals(0, obsInt.getCount());
+        assertEquals(1000, obsStr.getIndex());
+
+        target.accept(114514, Observer.DIRECTION_ADD, 1919810);
+        obsInt.assertCalled(Observer.DIRECTION_ADD);
+        assertEquals(1919810, obsInt.getIndex());
+
+        target.accept(obsInt, Observer.DIRECTION_CHANGE, 1);
+        obsObs.assertCalled(Observer.DIRECTION_CHANGE);
+
+        target.accept(new ArrayList<>(), Observer.DIRECTION_CHANGE, 2);
+        obsArrList.assertCalled(Observer.DIRECTION_CHANGE);
+        assertEquals(0, obsList.getCount());
+    }
+}