Legger til en Direction enum og tester

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

@@ -0,0 +1,60 @@
+package inf112.fiasko.roborally;
+
+import inf112.fiasko.roborally.abstractions.Direction;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class DirectionTest {
+
+    @Test
+    public void getDirectionIdForNorth() {
+        assertEquals(1, Direction.NORTH.getDirectionID());
+    }
+
+    @Test
+    public void getDirectionFromNorthID() {
+        assertEquals(Direction.NORTH, Direction.getDirectionFromID(1));
+    }
+
+    @Test
+    public void getDirectionIdForSouthWest() {
+        assertEquals(6, Direction.SOUTH_WEST.getDirectionID());
+    }
+
+    @Test
+    public void getDirectionFromSouthWestID() {
+        assertEquals(Direction.SOUTH_WEST, Direction.getDirectionFromID(6));
+    }
+
+    @Test
+    public void allDirectionsIDConversionToIDAndBack() {
+        for (Direction direction : Direction.values()) {
+            assertEquals(direction, Direction.getDirectionFromID(direction.getDirectionID()));
+        }
+    }
+
+    @Test
+    public void invalidDirectionIDReturnsNull() {
+        assertNull(Direction.getDirectionFromID(-1));
+    }
+
+    @Test
+    public void allDirectionsHaveUniqueId() {
+        /* This test is also done implicitly by the allDirectionsIDConversionToIDAndBack test, but that test may fail
+           even if this test passes, so this test is needed for clarity. */
+        Set<Integer> set = new HashSet<>();
+        List<Integer> list = new ArrayList<>();
+        for (Direction direction : Direction.values()) {
+            set.add(direction.getDirectionID());
+            list.add(direction.getDirectionID());
+        }
+        assertEquals(list.size(), set.size());
+    }
+}