RED: test rover initialization

test/mars_rover_test.dart

@@ -0,0 +1,14 @@
+import 'package:test/test.dart';
+import 'package:tdd_katas/mars_rover.dart';
+
+void main() {
+  group('Mars Rover:', () {
+    test('rover reports initial position and direction', () {
+      final rover = Rover(x: 0, y: 0, direction: 'N');
+      
+      expect(rover.x, equals(0));
+      expect(rover.y, equals(0));
+      expect(rover.direction, equals('N'));
+    });
+  });
+}