[#2847] Added Deliverable#overhead_spent to calculate the overhead cost so far.

spec/lib/overhead_deliverable_patch_spec.rb

@@ -0,0 +1,42 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe Deliverable, '#overhead_spent' do
+  before(:each) do
+    @deliverable = Deliverable.new
+  end
+
+  it 'should equal the product of overhead timelogs by their cost' do
+    issue1 = mock_model(Issue)
+    issue1.stub!(:time_entries).and_return do
+      [
+       mock_model(TimeEntry, :cost => 100.0, :billable? => true),
+       mock_model(TimeEntry, :cost => 200.0, :billable? => false)
+       ]
+    end
+    issue2 = mock_model(Issue)
+    issue2.stub!(:time_entries).and_return do
+      [
+       mock_model(TimeEntry, :cost => 10.0, :billable? => false),
+       mock_model(TimeEntry, :cost => 40.0, :billable? => false)
+       ]
+    end
+    
+    issues = [issue1, issue2]
+    
+    @deliverable.stub!(:issues).and_return(issues)
+    @deliverable.overhead_spent.should eql(250.0)
+  end
+
+  it 'should be 0.0 if there are no issues assigned' do
+    @deliverable.stub!(:issues).and_return([])
+    @deliverable.overhead_spent.should eql(0)
+  end
+
+  it 'should be 0.0 if there are no time entries' do
+    issue1 = mock_model(Issue, :time_entries => [])
+    issue2 = mock_model(Issue, :time_entries => [])
+
+    @deliverable.stub!(:issues).and_return([issue1, issue2])
+    @deliverable.overhead_spent.should eql(0)
+  end
+end