diff --git a/lib/simplecov-json.rb b/lib/simplecov-json.rb
index 874be89..cad43ce 100644
--- a/lib/simplecov-json.rb
+++ b/lib/simplecov-json.rb
@@ -2,48 +2,54 @@ require 'simplecov'
 require 'json'
 
 class SimpleCov::Formatter::JSONFormatter
+  
   def format(result)
-    puts result.inspect
     data = {}
     data[:timestamp] = result.created_at.to_i
     data[:command_name] = result.command_name
     data[:files] = []
-    result.original_result.each do |filename,coverage| 
+    result.original_result.each do |filename, coverage|
       next unless result.filenames.include? filename
+      
       data[:files] << {
         filename: filename,
-        coverage: coverage,
+        coverage: coverage
       }
     end
-    data[:groups] = result.groups
     data[:metrics] = {
       covered_percent: result.covered_percent,
       covered_strength: result.covered_strength,
       covered_lines: result.covered_lines,
-      total_lines: result.total_lines,
+      total_lines: result.total_lines
     }
-    File.open(File.join(output_path, output_filename), "w+") do |file|
-      file.puts data.to_json
+    
+    json = data.to_json
+    
+    File.open(output_filepath, "w+") do |file|
+      file.puts json
     end
+    
     puts output_message(result)
-    data.to_json
+    
+    json
   end
-
+  
   def output_filename
     'coverage.json'
   end
-
+  
   def output_filepath
     File.join(output_path, output_filename)
   end
-
+  
   def output_message(result)
     "Coverage report generated for #{result.command_name} to #{output_filepath}. #{result.covered_lines} / #{result.total_lines} LOC (#{result.covered_percent.round(2)}%) covered."
   end
-
-  private 
+  
+private
   
   def output_path
     SimpleCov.coverage_path
   end
+  
 end
diff --git a/simplecov-json.gemspec b/simplecov-json.gemspec
index 3b74e2c..e76f0bd 100644
--- a/simplecov-json.gemspec
+++ b/simplecov-json.gemspec
@@ -16,6 +16,8 @@ Gem::Specification.new do |s|
   s.test_files    = ['test/helper.rb', 'test/test_simplecov_json.rb']
   s.require_paths = ["lib"]
   
-  s.add_dependency(%q<simplecov>, [">= 0"])
-  s.add_dependency(%q<json>, [">= 0"])
+  s.add_dependency "simplecov"
+  s.add_dependency "json"
+  
+  s.add_development_dependency "rake"
 end
diff --git a/test/helper.rb b/test/helper.rb
index df6ee5f..ab1710c 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -4,7 +4,7 @@ require 'simplecov'
 require 'simplecov-json'
 
 require 'test/unit'
-require 'mocha'
+require 'mocha/setup'
 
 class Test::Unit::TestCase
 end
diff --git a/test/test_simplecov_json.rb b/test/test_simplecov_json.rb
index c39b77d..ff2c6ac 100644
--- a/test/test_simplecov_json.rb
+++ b/test/test_simplecov_json.rb
@@ -16,7 +16,6 @@ class TestSimpleCovHtml < Test::Unit::TestCase
     result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
     result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
     result.expects(:filenames).returns(['/lib/foo.rb', '/lib/bar.rb'])
-    result.expects(:groups).returns(['controllers', 'models'])
     result.expects(:covered_percent).returns(73.33)
     result.expects(:covered_strength).returns(0.87)
     result.expects(:covered_lines).returns(11)
@@ -34,7 +33,6 @@ class TestSimpleCovHtml < Test::Unit::TestCase
         {'filename' => '/lib/foo.rb', 'coverage' => [1, nil, 0, 0, nil, 1, nil]},
         {'filename' => '/lib/bar.rb', 'coverage' => [nil, 1, nil, 1, 1, 1, 0, 0, nil, 1, nil]},
       ],
-      'groups' =>['controllers', 'models'],
       'metrics' => {
         'covered_percent' => 73.33,
         'covered_strength' => 0.87,