fixed bug in tests which inverted sense of #added_methods, and added …

…#added_complexity

commit.rb

@@ -4,7 +4,19 @@ module RepoDepot
   class Commit < CodeHistory
 
     def added_methods
-      Repository.new('', @events.select {|e| e.previous_state }).methods
+      Repository.new('', events.reject {|e| e.previous_state }).methods
+    end
+
+    def added_complexity
+      events.reduce(0.0) do |sum,e|
+        if not e.previous_state
+          sum += e.complexity
+        elsif e.previous_state.complexity >= e.complexity
+          sum += 0.0
+        else
+          sum += e.complexity - e.previous_state.complexity
+        end
+      end
     end
 
   end

commit_spec.rb

@@ -9,15 +9,41 @@
       RepoDepot::Commit.new('', []).added_methods.should be_empty
     end
 
-    it "has zero methods when the commit has only events with no previous state" do
+    it "has one method when the commit has an event with no previous state" do
       (events ||= []) << CodeEvent.new({})
-      RepoDepot::Commit.new('', events).added_methods.should be_empty
+      RepoDepot::Commit.new('', events).added_methods.count.should eq(1)
     end
 
-    it "has one method when the commit has an event with a previous state" do
-      events = [CodeEvent.new({}), CodeEvent.new({})]
-      weave(events)
-      RepoDepot::Commit.new('', events).added_methods.count.should eq(1)
+    it "has no method when the commit has an event with a previous state" do
+      (events ||= []) << CodeEvent.new(previous_state: CodeEvent.new({}))
+      RepoDepot::Commit.new('', events).added_methods.count.should eq(0)
+    end
+  end
+
+  context "#added_complexity" do
+    it "has the complexity of added methods when there are no previous events" do
+      events = [CodeEvent.new(complexity: 0.5), CodeEvent.new(complexity: 0.5)]
+      RepoDepot::Commit.new('', events).added_complexity.should eq(1.0)
+    end
+
+    it "has the difference of current and previous complexities for non-added methods" do
+      previous = CodeEvent.new(complexity: 0.3)
+      current = CodeEvent.new(complexity: 1.0, previous_state: previous)
+      RepoDepot::Commit.new('', [current]).added_complexity.should eq(0.7)
+    end
+
+    it "reports zero for added complexity when a method reduces in complexity" do
+      previous = CodeEvent.new(complexity: 0.3)
+      current = CodeEvent.new(complexity: 0.1, previous_state: previous)
+      RepoDepot::Commit.new('', [current]).added_complexity.should eq(0.0)
+    end
+
+    it "dances grand coupe den finalen" do
+      previous = CodeEvent.new(complexity: 0.1)
+      events = [CodeEvent.new(complexity: 0.5),
+                CodeEvent.new(complexity: 0.3),
+                CodeEvent.new(complexity: 0.2, previous_state: previous)]
+      RepoDepot::Commit.new('', events).added_complexity.should eq(0.9)
     end
   end
 end