Add new test, and make the width and height arguments for the

animation constructor be on the same line while I'm here.

test/test_animation.rb

@@ -11,11 +11,18 @@ def setup
 
     # This animation has 4 frames
     @sample_animation = AniRuby::Animation.new(media_dir('king_walk.png'),
-                                               @sprite_w,
-                                               @sprite_h,
+                                               @sprite_w, @sprite_h,
                                                @duration)
   end
 
+  def test_extra_durations_are_discarded
+    # The king's walk animation has only four frames, but here
+    # we passed six durations
+    AniRuby::Animation.new(media_dir('king_walk.png'),
+                           @sprite_w, @sprite_h,
+                           0.1, 0.2, 0.3, 0.4, 0.5, 0.6)
+  end
+
   def test_starts_at_zero
     assert_equal 0, @sample_animation.cursor
   end