diff --git a/Rakefile b/Rakefile
index db8bed4..26779e0 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,12 +14,23 @@ require 'jasmine/headless/task'
 
 Jasmine::Headless::Task.new
 
+PLATFORMS = %w{1.8.7 1.9.2 ree 1.9.3-rc1}
+
+def rvm_bundle(command = '')
+  Bundler.with_clean_env do
+    system %{bash -c 'unset BUNDLE_BIN_PATH && unset BUNDLE_GEMFILE && rvm #{PLATFORMS.join(',')} ruby bundle #{command}'}.tap { |o| p o }
+  end
+end
+
+class SpecFailure < StandardError; end
+class BundleFailure < StandardError; end
+
 namespace :spec do
   desc "Run on three Rubies"
   task :platforms do
-    system %{rvm 1.8.7,1.9.2,ree ruby bundle}
-    system %{rvm 1.8.7,1.9.2,ree ruby bundle exec rake spec}
-    raise StandardError.new if $?.exitstatus != 0
+    rvm_bundle
+    rvm_bundle "exec rspec spec"
+    raise SpecError.new if $?.exitstatus != 0
   end
 end
 
@@ -31,3 +42,4 @@ task :build_runner do
     system %{ruby extconf.rb}
   end
 end
+
diff --git a/lib/jasmine/files_list.rb b/lib/jasmine/files_list.rb
index 2764b28..2295111 100644
--- a/lib/jasmine/files_list.rb
+++ b/lib/jasmine/files_list.rb
@@ -1,5 +1,4 @@
 require 'jasmine-core'
-require 'iconv'
 require 'time'
 require 'multi_json'
 
@@ -64,7 +63,6 @@ module Jasmine
           alert_time = nil
         end
 
-        function_locations = {}
         source = nil
 
         result = case File.extname(file)
diff --git a/lib/jasmine/headless/spec_file_analyzer.rb b/lib/jasmine/headless/spec_file_analyzer.rb
index 252b067..0ac0899 100644
--- a/lib/jasmine/headless/spec_file_analyzer.rb
+++ b/lib/jasmine/headless/spec_file_analyzer.rb
@@ -1,4 +1,3 @@
-require 'iconv'
 require 'multi_json'
 
 module Jasmine::Headless
@@ -12,8 +11,16 @@ module Jasmine::Headless
     def action
       line_numbers = {}
 
-      ic = Iconv.new('UTF-8//IGNORE', 'US-ASCII')
-      data = ic.iconv(File.read(file) + ' ')[0..-2]
+      data = File.read(file)
+
+      if data.respond_to?(:encode)
+        data.encode!('US-ASCII', 'UTF-8', :invalid => :replace)
+      else
+        require 'iconv'
+        ic = Iconv.new('UTF-8//IGNORE', 'US-ASCII')
+        data = ic.iconv(File.read(file) + ' ')[0..-2]
+      end
+
       data.force_encoding('US-ASCII') if data.respond_to?(:force_encoding)
 
       data.lines.each_with_index.each { |line, index|