Crop PNGs, now with more rounded corners!

Contributes to #11

spec/args/transform_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+require 'squib/args/transform'
+
+describe Squib::Args::Box do
+  subject(:trans) { Squib::Args::Transform.new }
+  let(:expected_defaults) { {x: [0], y: [0], crop_width: [:native], crop_height: [:native] } }
+
+  context 'validation' do
+    it 'replaces with deck width and height' do
+      args  = {crop_width: :deck, crop_height: :deck}
+      deck  = OpenStruct.new(width: 123, height: 456)
+      trans = Squib::Args::Transform.new(deck)
+      trans.load!(args, expand_by: 1)
+      expect(trans).to have_attributes(crop_width: [123], crop_height: [456])
+    end
+
+    it 'has radius override x_radius and y_radius' do
+      args = {crop_corner_x_radius: 1, crop_corner_y_radius: 2, crop_corner_radius: 3}
+      trans.load!(args, expand_by: 2)
+      expect(trans).to have_attributes(crop_corner_x_radius: [3, 3], crop_corner_y_radius: [3, 3])
+    end
+
+  end
+
+end