hobo-up persists the UUID of the VM

.gitignore

@@ -2,3 +2,4 @@ gembin/*
 vendor/gems/*
 pkg/*
 Hobofile
+.hobo

lib/hobo/vm.rb

@@ -18,7 +18,7 @@ module Hobo
 
       def persist_uuid(vm)
         HOBO_LOGGER.info "Persisting the VM UUID (#{vm.uuid})..."
-        # TODO: persist it! dot file in the root (where Hobofile is)
+        Env.persist_uuid(vm.uuid)
       end
 
       def setup_mac_address(vm)

test/hobo/vm_test.rb

@@ -31,7 +31,11 @@ class VMTest < Test::Unit::TestCase
   end
 
   context "persisting UUID" do
-    # TODO, functionality doesn't exist yet
+    should "persist the UUID with Env" do
+      @vm.stubs(:uuid).returns("FOO")
+      Hobo::Env.expects(:persist_uuid).with(@vm.uuid).once
+      Hobo::VM.persist_uuid(@vm)
+    end
   end
 
   context "setting up MAC address" do