Refactoring out the unit conversion to its own place

spec/args/unit_conversion_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+require 'squib/args/unit_conversion'
+
+describe Squib::Args::UnitConversion do
+
+  it 'does nothing on just numbers'  do
+    expect(subject.parse(20)).to eq(20)
+  end
+
+  it 'strips trailing whitespace'  do
+    expect(subject.parse('1in ')).to eq(300)
+  end
+
+  it 'is ok w/internal whitesapce' do
+    expect(subject.parse('1 in')).to eq(300)
+  end
+
+  it 'does cm'                      do
+    expect(subject.parse('1cm')).to eq(118.1102361)
+  end
+
+end