extract padding functions to module

and finally TEST them
its especially the brain bending stuff that needs tests

test/virtual/test_padding.rb

@@ -0,0 +1,38 @@
+require_relative "../helper"
+
+class Padded
+  include Padding
+end
+
+class TestPadding < MiniTest::Test
+
+  def setup
+    @pad = Padded.new
+  end
+  def test_small
+    [6,20,23,24].each do |p|
+      assert_equal 32 , @pad.padded(p) , "Expecting 32 for #{p}"
+    end
+  end
+  def test_large
+    [26,40,53,56].each do |p|
+      assert_equal 64 , @pad.padded(p) , "Expecting 64 for #{p}"
+    end
+  end
+end
+
+class TestPositioning < MiniTest::Test
+  def test_list1
+    list = Virtual.new_list([1])
+    assert_equal 32 , list.mem_length
+  end
+  def test_list5
+    list = Virtual.new_list([1,2,3,4,5])
+    assert_equal 32 , list.mem_length
+  end
+  def test_layout
+    layout = Parfait::Layout.new Object
+    layout.push 5
+    assert_equal 32 , layout.mem_length
+  end
+end