Move Project#create_from_todo to its own class

The point of this is to keep as many things out of the ActiveRecord
objects as possible and use them as just a thin database abstraction
layer.

test/unit/project_from_todo_test.rb

@@ -0,0 +1,22 @@
+require_relative '../test_helper'
+require_relative '../../lib/project_from_todo'
+
+class ProjectFromTodoTest < ActiveSupport::TestCase
+  fixtures :todos
+
+  def test_create_project_from_valid_todo
+    todo = todos(:upgrade_rails)
+    project = ProjectFromTodo.new(todo).create
+    assert_equal project.name, todo.description
+    assert_equal project.description, todo.notes
+    assert_equal project.default_context, todo.context
+  end
+
+  def test_invalid_project_from_invalid_todo
+    todo = todos(:upgrade_rails)
+    todo.description = ""
+    project = ProjectFromTodo.new(todo).create
+    assert_not_nil project
+    assert_equal false, project.valid?
+  end
+end

test/unit/project_test.rb

@@ -167,14 +167,6 @@ class ProjectTest < ActiveSupport::TestCase
     assert_equal 3, @moremoney.todos.not_completed.count
   end
 
-  def test_convert_from_todo
-    todo = todos(:upgrade_rails)
-    project = Project.create_from_todo(todo)
-    assert_equal project.name, todo.description
-    assert_equal project.description, todo.notes
-    assert_equal project.default_context, todo.context
-  end
-
   def test_new_record_before_save
     assert !@timemachine.new_record_before_save?, "existing records should not be new_record"
     p = Project.where(:name => "I do not exist").first_or_create