units: support mm

Closes #161

spec/api/api_units_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+describe Squib::Deck do
+
+  let(:deck) { Squib::Deck.new }
+
+  context '#in' do
+    it 'converts inches properly' do
+      expect(deck.inches(1)).to eq 300
+    end
+
+    it 'handles strings too' do
+      expect(deck.inches('1')).to eq 300
+    end
+  end
+
+  context '#cm' do
+    it 'converts inches properly' do
+      expect(deck.cm(1)).to eq 118.1102361
+    end
+
+    it 'handles strings too' do
+      expect(deck.cm('1')).to eq 118.1102361
+    end
+  end
+
+  context '#mm' do
+    it 'converts inches properly' do
+      expect(deck.mm(1)).to eq 11.81102361
+    end
+
+    it 'handles strings too' do
+      expect(deck.mm('1')).to eq 11.81102361
+    end
+  end
+
+end

spec/args/unit_conversion_spec.rb

@@ -15,8 +15,15 @@ describe Squib::Args::UnitConversion do
     expect(subject.parse('1 in')).to eq(300)
   end
 
-  it 'does cm'                      do
+  it 'does cm' do
     expect(subject.parse('1cm')).to eq(118.1102361)
+    expect(subject.parse('1cm  ')).to eq(118.1102361)
   end
 
+  it 'does mm' do
+    expect(subject.parse('1mm')).to eq(11.81102361)
+    expect(subject.parse('1mm  ')).to eq(11.81102361)
+  end
+
+
 end