diff --git a/README.md b/README.md
index 9db7fdc..a30a9ef 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,9 @@ Make sure bwoken is <a href="#installation">properly installed</a>. Then, build
 <pre><code># will build and run all of your tests
 $ rake
 
+# will use xunit output formatter (default colorized)
+$ rake formatter=xunit
+
 # will run one file, relative to integration/coffeescript (note: no file extension)
 $ RUN=iphone/focused_test rake
 </code></pre>
diff --git a/lib/bwoken.rb b/lib/bwoken.rb
index 83df83c..d10ae75 100644
--- a/lib/bwoken.rb
+++ b/lib/bwoken.rb
@@ -3,6 +3,7 @@
 require 'bwoken/build'
 require 'bwoken/coffeescript'
 require 'bwoken/formatters/colorful_formatter'
+require 'bwoken/formatters/xunit_formatter'
 require 'bwoken/script'
 require 'bwoken/simulator'
 require 'bwoken/device'
@@ -23,7 +24,12 @@ def app_name
     end
 
     def formatter
-      @formatter ||= Bwoken::ColorfulFormatter.new
+      formatter_type = ENV['formatter'] || 'color'
+      if formatter_type == 'xunit'
+        @formatter = Bwoken::XunitFormatter::Formatter.new(File.join(results_path, "#{app_name}.xml"))
+      else
+        @formatter = Bwoken::ColorfulFormatter.new
+      end
     end
 
     def project_path
diff --git a/lib/bwoken/formatter.rb b/lib/bwoken/formatter.rb
index ff3a231..619f002 100644
--- a/lib/bwoken/formatter.rb
+++ b/lib/bwoken/formatter.rb
@@ -12,7 +12,7 @@ def format_build stdout
 
       def on name, &block
         define_method "_on_#{name}_callback" do |*line|
-          block.call(*line)
+          self.instance_exec(*line, &block)
         end
       end
 
diff --git a/lib/bwoken/formatters/xunit_formatter.rb b/lib/bwoken/formatters/xunit_formatter.rb
new file mode 100644
index 0000000..5890723
--- /dev/null
+++ b/lib/bwoken/formatters/xunit_formatter.rb
@@ -0,0 +1,150 @@
+require 'bwoken/formatter'
+require 'date'
+
+module Bwoken::XunitFormatter
+
+  ##
+  # based on the code by @sebastianludwig as a part of tuneup.js
+  # https://github.com/alexvollmer/tuneup_js/blob/master/test_runner/xunit_output.rb
+  ##
+  class TestSuite
+    attr_reader :name, :timestamp
+    attr_accessor :test_cases
+
+    def initialize(name)
+      @name = name
+      @test_cases = []
+      @timestamp = DateTime.now
+    end
+
+    def failures
+      @test_cases.count { |test| test.failed? }
+    end
+
+    def time
+      @test_cases.map { |test| test.time }.inject(:+)
+    end
+  end
+
+  class TestCase
+    attr_reader :name
+    attr_accessor :messages
+
+    def initialize(name)
+      @name     = name
+      @messages = []
+      @failed   = true
+      @start    = Time.now
+      @finish   = nil
+    end
+
+    def <<(message)
+      @messages << message
+    end
+
+    def pass!
+      @failed = false;
+      @finish = Time.now
+    end
+
+    def fail!
+      @finish = Time.now
+    end
+
+    def failed?
+      @failed
+    end
+
+    def time
+      return 0 if @finish.nil?
+      @finish - @start
+    end
+  end
+
+  class XunitOutput
+    attr_reader :suite
+
+    def initialize(filename)
+      @filename = filename
+      @suite = TestSuite.new(File.basename(filename, File.extname(filename)))
+    end
+
+    def add(line)
+      return if @suite.test_cases.empty?
+      @suite.test_cases.last << line
+    end
+
+    def add_status(status, msg)
+      case status
+      when :start
+        @suite.test_cases << TestCase.new(msg)
+      when :pass
+        @suite.test_cases.last.pass!
+      when :fail
+        @suite.test_cases.last.fail!
+      end
+    end
+
+    def close
+      File.open(@filename, 'w') { |f| f.write(serialize(@suite)) }
+    end
+
+    def xml_escape(input)
+       result = input.dup
+
+       result.gsub!("&", "&amp;")
+       result.gsub!("<", "&lt;")
+       result.gsub!(">", "&gt;")
+       result.gsub!("'", "&apos;")
+       result.gsub!("\"", "&quot;")
+
+       return result
+    end
+
+    def serialize(suite)
+      output = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" << "\n"
+      output << "<testsuite name=\"#{xml_escape(suite.name)}\" timestamp=\"#{suite.timestamp}\" time=\"#{suite.time}\" tests=\"#{suite.test_cases.count}\" failures=\"#{suite.failures}\">" << "\n"
+
+      suite.test_cases.each do |test|
+        output << "  <testcase name=\"#{xml_escape(test.name)}\" time=\"#{test.time}\">" << "\n"
+        if test.failed?
+          output << "    <failure>#{test.messages.map { |m| xml_escape(m) }.join("\n")}</failure>" << "\n"
+        end
+        output << "  </testcase>" << "\n"
+      end
+
+      output << "</testsuite>" << "\n"
+    end
+  end
+
+  class Formatter < Bwoken::Formatter
+
+    def initialize(filename)
+      @output = XunitOutput.new(filename)
+    end
+
+    on :complete do |line|
+      @output.close
+    end
+
+    on :error do |line|
+      tokens = line.split(' ')
+      @output.add(tokens[4..-1].join(' ')) if line.include?('Exception')
+    end
+
+    on :fail do |line|
+      tokens = line.split(' ')
+      @output.add_status(:fail, tokens[4..-1].join(' '))
+    end
+
+    on :start do |line|
+      tokens = line.split(' ')
+      @output.add_status(:start, tokens[4..-1].join(' '))
+    end
+
+    on :pass do |line|
+      tokens = line.split(' ')
+      @output.add_status(:pass, tokens[4..-1].join(' '))
+    end
+  end
+end
diff --git a/spec/lib/bwoken/formatters/xunit_formatter_spec.rb b/spec/lib/bwoken/formatters/xunit_formatter_spec.rb
new file mode 100644
index 0000000..0a798ef
--- /dev/null
+++ b/spec/lib/bwoken/formatters/xunit_formatter_spec.rb
@@ -0,0 +1,177 @@
+require 'spec_helper'
+
+require 'bwoken/formatters/xunit_formatter'
+
+describe Bwoken::XunitFormatter::TestSuite do
+  subject { described_class.new('FakeProject') }
+
+  describe '.failures' do
+    context 'when contain failed test case' do
+      before { subject.test_cases << Bwoken::XunitFormatter::TestCase.new('foo') }
+      it 'returns number of failed cases' do
+        subject.failures.should == 1
+      end
+    end
+  end
+
+  describe '.time' do
+    before do
+      foo = Bwoken::XunitFormatter::TestCase.new('foo')
+      bar = Bwoken::XunitFormatter::TestCase.new('bar')
+      foo.stub(:time => 10)
+      bar.stub(:time => 1)
+      subject.test_cases << foo
+      subject.test_cases << bar
+    end
+
+    it 'returns number of seconds cosumed for all cases' do
+      subject.time.should == 11
+    end
+  end
+end
+
+describe Bwoken::XunitFormatter::TestCase do
+  subject { described_class.new('FakeTest') }
+
+  describe '.pass!' do
+    before do
+      time = Time.now
+      Time.stub(:now => time)
+      subject << 'Triggering creation'
+      Time.stub(:now => time + 2)
+      subject.pass!
+    end
+
+    it 'changes case status to passed' do
+      subject.failed?.should == false;
+    end
+
+    it 'saves finished time' do
+      subject.time.should == 2
+    end
+  end
+
+  describe '.fail!' do
+    before do
+      time = Time.now
+      Time.stub(:now => time)
+      subject << 'Triggering creation'
+      Time.stub(:now => time + 2)
+      subject.fail!
+    end
+
+    it 'saves finished time' do
+      subject.time.should == 2
+    end
+  end
+
+  describe '.failed?' do
+    context 'when test failed' do
+      it 'returns true' do
+        subject.failed?.should == true
+      end
+    end
+
+    context 'when test passed' do
+      before { subject.pass! }
+      it 'returns false' do
+        subject.failed?.should == false
+      end
+    end
+  end
+
+  describe '.time' do
+    context 'when test finished' do
+      before do
+        time = Time.now
+        Time.stub(:now => time)
+        subject << 'Triggering creation'
+        Time.stub(:now => time + 2)
+        subject.pass!
+      end
+
+      it 'returns number of seconds consumed by test case' do
+        subject.time.should == 2
+      end
+    end
+
+    context 'when test is not finished' do
+      it 'returns 0' do
+        subject.time.should == 0
+      end
+    end
+  end
+end
+
+describe Bwoken::XunitFormatter::XunitOutput do
+  subject { described_class.new('fake_file_path') }
+
+  describe '.add' do
+    before { subject.add_status(:start, '') }
+    it 'appends line to the last test case' do
+      subject.suite.test_cases.last.should_receive(:<<).with('foo')
+      subject.add('foo')
+    end
+  end
+
+  describe '.addStatus' do
+    context 'with :start' do
+      it 'creates new test case' do
+        subject.suite.test_cases.should_receive(:<<)
+        subject.add_status(:start, '')
+      end
+    end
+
+    context 'with :pass' do
+      before { subject.add_status(:start, '') }
+      it 'changes last test case status to passed' do
+        subject.suite.test_cases.last.should_receive(:pass!)
+        subject.add_status(:pass, '')
+      end
+    end
+
+    context 'with :fail' do
+      before { subject.add_status(:start, '') }
+      it 'changes last test case status to failed' do
+        subject.suite.test_cases.last.should_receive(:fail!)
+        subject.add_status(:fail, '')
+      end
+    end
+  end
+
+  describe '.close' do
+    it 'writes serialized test suite to the file' do
+      File.should_receive(:open).with('fake_file_path', 'w')
+      subject.close
+    end
+  end
+
+  describe '.serialize' do
+    before do
+      @datetime = DateTime.now
+      DateTime.stub(:now => @datetime)
+
+      @time = Time.now
+      Time.stub(:now => @time)
+
+      subject.add_status(:start, 'failed case')
+      subject.add('foo')
+      subject.add_status(:fail, '')
+      subject.add_status(:start, 'passed case')
+      subject.add_status(:pass, '')
+    end
+
+    it 'returns test suite as xml document' do
+      subject.serialize(subject.suite).should == <<-XML
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<testsuite name="fake_file_path" timestamp="#{@datetime}" time="0.0" tests="2" failures="1">
+  <testcase name="failed case" time="0.0">
+    <failure>foo</failure>
+  </testcase>
+  <testcase name="passed case" time="0.0">
+  </testcase>
+</testsuite>
+      XML
+    end
+  end
+end
diff --git a/spec/lib/bwoken_spec.rb b/spec/lib/bwoken_spec.rb
index dc7e113..c796c4e 100644
--- a/spec/lib/bwoken_spec.rb
+++ b/spec/lib/bwoken_spec.rb
@@ -14,8 +14,21 @@
   end
 
   describe '#formatter' do
-    it 'returns Bwoken::ColorfulFormatter' do
-      subject.formatter.should be_kind_of(Bwoken::ColorfulFormatter)
+    context 'without formatter env variable' do
+      it 'returns Bwoken::ColorfulFormatter' do
+        subject.formatter.should be_kind_of(Bwoken::ColorfulFormatter)
+      end
+    end
+
+    context "with ENV['formatter'] = 'xunit'" do
+      before do
+        ENV['formatter'] = 'xunit'
+        subject.stub(:app_name => 'FakeProject')
+      end
+
+      it 'returns Bwoken::XunitFormatter for ' do
+        subject.formatter.should be_kind_of(Bwoken::XunitFormatter::Formatter)
+      end
     end
   end