add color to fields

fh.fd.ci.server/src/main/java/de/fd/fh/server/game/GameService.java

@@ -32,9 +32,14 @@ public class GameService
         {
             for (int y = 0; y < 8; y++)
             {
-                fields.add(new Field(x, y, null , null));
+                fields.add(new Field(x, y, getColor(x, y) , null));
             }
         }
         return fields;
     }
+
+    private Field.Color getColor(final int x, final int y)
+    {
+        return (x + y) % 2 != 1 ? Field.Color.WHITE : Field.Color.BLACK;
+    }
 }

fh.fd.ci.server/src/test/java/de/fd/fh/server/game/GameServiceTest.java

@@ -5,6 +5,8 @@ import dev.morphia.Key;
 import org.junit.jupiter.api.Test;
 import org.mockito.ArgumentCaptor;
 
+import java.util.Set;
+
 import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.then;
@@ -54,6 +56,15 @@ class GameServiceTest
         assertEquals("98765", savedGame.getCurrentPlayer().getIdentifier());
         assertEquals(64, savedGame.getFields().size());
 
+        final Set<Field> fields = savedGame.getFields();
+
+        fields.forEach(field -> {
+
+            final Field.Color expected = (field.getX() + field.getY()) % 2 != 1 ? Field.Color.WHITE : Field.Color.BLACK;
+
+            assertEquals(expected, field.getColor());
+        });
+
         then(repository).should().save(any(Game.class));
         then(repository).shouldHaveNoMoreInteractions();
     }