Adds a Grid class and GridTest class

src/test/java/inf112/fiasko/roborally/GridTest.java

@@ -0,0 +1,50 @@
+package inf112.fiasko.roborally;
+
+import inf112.fiasko.roborally.element_properties.TileType;
+import inf112.fiasko.roborally.objects.Grid;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class GridTest {
+    private Grid<TileType> grid;
+    private Grid<TileType> grid2;
+
+    @Before
+    public void setUp() {
+        grid = new Grid<>(7, 4);
+        grid2 = new Grid<>(5,8, TileType.TILE);
+    }
+
+    @Test
+    public void getWidthFromGrid() {
+        assertEquals(4, grid.getWidth());
+    }
+
+    @Test
+    public void getWidthFromGrid2() {
+        assertEquals(8, grid2.getWidth());
+    }
+
+    @Test
+    public void getHeightFromGrid() {
+        assertEquals(7,grid.getHeight());
+    }
+
+    @Test
+    public void getHeightFromGrid2() {
+        assertEquals(5,grid2.getHeight());
+    }
+
+    @Test
+    public void getElementFromGrid2() {
+        assertEquals(TileType.TILE, grid2.getElement(5,3));
+    }
+
+    @Test
+    public void setElementInGrid2() {
+        grid2.setElement(2,1, TileType.HOLE);
+        assertEquals(TileType.HOLE, grid2.getElement(2,1));
+    }
+}