diff --git a/spec/lib/rate_time_entry_patch_spec.rb b/spec/lib/rate_time_entry_patch_spec.rb
deleted file mode 100644
index 56469fd..0000000
--- a/spec/lib/rate_time_entry_patch_spec.rb
+++ /dev/null
@@ -1,29 +0,0 @@
-require File.dirname(__FILE__) + '/../spec_helper'
-
-describe TimeEntry, 'cost' do
-  before(:each) do
-    @user = mock_model(User)
-    @project = mock_model(Project)
-    @date = Date.today.to_s
-    @time_entry = TimeEntry.new({:user => @user, :project => @project, :spent_on => @date, :hours => 10.0})
-  end
-  
-  it 'should return 0.0 if there are no rates for the user' do
-    Rate.should_receive(:amount_for).with(@user, @project, @date).and_return(nil)
-    @time_entry.cost.should eql(0.0)
-  end
-
-  describe 'should return the product of hours by' do
-    it 'the results of Rate.amount_for' do
-      Rate.should_receive(:amount_for).with(@user, @project, @date).and_return(200.0)
-      @time_entry.cost.should eql(200.0 * @time_entry.hours)
-    end
-
-    it 'the assigned rate' do
-      rate = mock_model(Rate, :amount => 100.0)
-      @time_entry.should_receive(:rate).at_least(:twice).and_return(rate)
-      @time_entry.cost.should eql(rate.amount * @time_entry.hours)
-    end
-
-  end
-end
diff --git a/test/unit/lib/rate_time_entry_patch_test.rb b/test/unit/lib/rate_time_entry_patch_test.rb
new file mode 100644
index 0000000..1945ac7
--- /dev/null
+++ b/test/unit/lib/rate_time_entry_patch_test.rb
@@ -0,0 +1,29 @@
+require File.dirname(__FILE__) + '/../../test_helper'
+
+class RateTimeEntryPatchTest < ActiveSupport::TestCase
+  def setup
+    @user = User.generate!
+    @project = Project.generate!
+    @date = Date.today.to_s
+    @time_entry = TimeEntry.new({:user => @user, :project => @project, :spent_on => @date, :hours => 10.0})
+  end
+  
+  should 'should return 0.0 if there are no rates for the user' do
+    assert_equal 0.0, @time_entry.cost
+  end
+
+  context 'should return the product of hours by' do
+    should 'the results of Rate.amount_for' do
+      Rate.generate!(:user => @user, :project => @project, :date_in_effect => @date, :amount => 200.0)
+      assert_equal((200.0 * @time_entry.hours), @time_entry.cost)
+    end
+
+    should 'the assigned rate' do
+      rate = Rate.generate!(:user => @user, :project => @project, :date_in_effect => @date, :amount => 100.0)
+      @time_entry.rate = rate
+      assert_equal rate.amount * @time_entry.hours, @time_entry.cost
+    end
+
+  end
+
+end