Rakefile in opal-0.3.26 vs Rakefile in opal-0.3.27

@@ -1,17 +1,16 @@
 require 'bundler/setup'
-
-require 'opal/version'
 require 'opal/rake_task'
 
 Opal::RakeTask.new do |t|
   t.dependencies = %w(opal-spec)
   t.files        = []   # we handle this by Opal.runtime instead
   t.parser       = true # we want to also build opal-parser.js (used in specs)
 end
 
-task :default => 'opal:test'
+# build runtime, dependencies and specs, then run the tests
+task :default => %w[opal opal:test]
 
 desc "Check file sizes for opal.js runtime"
 task :sizes do
   o = File.read 'build/opal.js'
   m = uglify o
@@ -39,7 +38,31 @@
 def gzip(str)
   IO.popen('gzip -f', 'r+') do |i|
     i.puts str
     i.close_write
     return i.read
+  end
+end
+
+# For testing just specific sections of opal
+desc "Build each test case"
+task :test_cases do
+  FileUtils.mkdir_p 'build/test_cases'
+
+  sources = Dir['spec/core/*', 'spec/language', 'spec/lib', 'spec/opal']
+
+  sources.each do |c|
+    dest = "build/test_cases/#{File.basename c}"
+    FileUtils.mkdir_p dest
+    File.open("#{dest}/specs.js", "w+") do |out|
+      out.puts Opal.build_files(c)
+    end
+
+    File.open("#{dest}/index.html", "w+") do |out|
+      out.puts File.read("spec/test_case.html")
+    end
+  end
+
+  File.open("build/test_cases/runner.js", "w+") do |out|
+    out.puts Opal.parse(File.read("spec/spec_helper.rb"))
   end
 end
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