Added tests for RotatedTile

src/test/java/model/RotatedTileTest.java

+package model;
+
+import javafx.scene.paint.Color;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class RotatedTileTest {
+
+  @Test
+  void testSide(){
+    Tile wangTile = new WangTile(new Side[]{new ColoredSide(Color.BLACK), new ColoredSide(Color.BLUE),
+            new ColoredSide(Color.WHITE), new ColoredSide(Color.RED)});
+    for(Rotation rotation : Rotation.values()){
+      RotatedTile rotatedTile = new RotatedTile(wangTile, rotation);
+      for (CardinalDirection direction : CardinalDirection.values()) {
+        assertThat(rotatedTile.side(direction)).isEqualTo(wangTile.side(rotation.rotatedDirection(direction)));
+      }
+    }
+  }
+}