Function to persist UUID

lib/hobo/env.rb

@@ -17,6 +17,7 @@ module Hobo
     class << self
       def persisted_uuid; @@persisted_uuid; end
       def root_path; @@root_path; end
+      def dotfile_path; File.join(root_path, Hobo.config[:dotfile_name]); end
 
       def load!
         load_root_path!
@@ -46,13 +47,19 @@ module Hobo
       end
 
       def load_uuid!
-        File.open(File.join(root_path, Hobo.config[:dotfile_name])) do |f|
+        File.open(dotfile_path) do |f|
           @@persisted_uuid = f.read
         end
       rescue Errno::ENOENT
         @@persisted_uuid = nil
       end
 
+      def persist_uuid(uuid)
+        File.open(dotfile_path, 'w+') do |f|
+          f.write(uuid)
+        end
+      end
+
       def load_root_path!(path=Pathname.new(Dir.pwd))
         if path.to_s == '/'
           error_and_exit(<<-msg)

test/hobo/env_test.rb

@@ -79,13 +79,30 @@ class EnvTest < Test::Unit::TestCase
     end
   end
 
-  context "loading the UUID out from the persisted file" do
-    test "loading of the uuid from the dotfile" do
+  context "persisting the UUID into a file" do
+    setup do
       Hobo.config! hobo_mock_config
+    end
+
+    test "should save it to the dotfile path" do
+      uuid = "foo"
 
+      filemock = mock("filemock")
+      filemock.expects(:write).with(uuid)
+      File.expects(:open).with(Hobo::Env.dotfile_path, 'w+').once.yields(filemock)
+      Hobo::Env.persist_uuid(uuid)
+    end
+  end
+
+  context "loading the UUID out from the persisted file" do
+    setup do
+      Hobo.config! hobo_mock_config
+    end
+
+    test "loading of the uuid from the dotfile" do
       filemock = mock("filemock")
       filemock.expects(:read).returns("foo")
-      File.expects(:open).with(File.join(Hobo::Env.root_path, hobo_mock_config[:dotfile_name])).once.yields(filemock)
+      File.expects(:open).with(Hobo::Env.dotfile_path).once.yields(filemock)
       Hobo::Env.load_uuid!
       assert_equal Hobo::Env.persisted_uuid, 'foo'
     end
@@ -95,6 +112,10 @@ class EnvTest < Test::Unit::TestCase
       Hobo::Env.load_uuid!
       assert_nil Hobo::Env.persisted_uuid
     end
+
+    test "should build up the dotfile out of the root path and the dotfile name" do
+      assert_equal File.join(Hobo::Env.root_path, hobo_mock_config[:dotfile_name]), Hobo::Env.dotfile_path
+    end
   end
 
   context "loading the root path" do