1 files changed, 41 insertions, 0 deletions
diff --git a/src/test/model/MockObserver.java b/src/test/model/MockObserver.java
new file mode 100644
index 0000000..bd3e79f
--- /dev/null
+++ b/src/test/model/MockObserver.java
@@ -0,0 +1,41 @@
+package model;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MockObserver<T> implements Observer<T> {
+    private int countPrev;
+    private int count;
+    private T data;
+    private int dir;
+    private int index;
+
+    @Override
+    public void accept(T data, int direction, int index) {
+        this.count++;
+        this.data = data;
+        this.dir = direction;
+        this.index = index;
+    }
+
+    public void assertCalled(int dir) {
+        assertEquals(countPrev + 1, count);
+        assertEquals(dir, this.dir);
+        countPrev = count;
+    }
+
+    public int getCount() {
+        return count;
+    }
+
+    public T getData() {
+        return data;
+    }
+
+    public int getDir() {
+        return dir;
+    }
+
+    public int getIndex() {
+        return index;
+    }
+}