[#2281] Added a TimeEntry#billable? method which is delegated to

TimeEntryActivity#billable?

spec/lib/overhead_time_entry_patch_spec.rb

@@ -0,0 +1,21 @@
+require File.dirname(__FILE__) + '/../spec_helper'
+
+describe TimeEntry, 'billable?' do
+  before(:each) do
+    @time_entry = TimeEntry.new
+  end
+
+  it 'should be true if the activity is considered billable' do
+    @time_entry.should_receive(:activity).and_return do
+      mock_model(TimeEntryActivity, :billable? => true)
+    end
+    @time_entry.billable?.should be_true
+  end
+
+  it 'should be false if the activity is considered overhead' do
+    @time_entry.should_receive(:activity).and_return do
+      mock_model(TimeEntryActivity, :billable? => false)
+    end
+    @time_entry.billable?.should be_false
+  end
+end