Mustache Spec compliance

.gitmodules

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+[submodule "ext/spec"]
+	path = ext/spec
+	url = git://github.com/mustache/spec.git

test/compliance_spec.rb

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+require 'rubygems'
+require 'yaml'
+require 'json'
+
+YAML::add_builtin_type('code') do |_, value|
+  value['js'].tap do |func|
+    def func.to_json(_)
+      "function() { return #{self}; }"
+    end
+  end
+end
+
+__DIR__ = File.dirname(__FILE__)
+
+testnames = Dir.glob(__DIR__ + '/../ext/spec/specs/[^~]*.yml').map do |name|
+  File.basename name, '.yml'
+end
+
+def load_tests(dir, name)
+  file = File.join(dir, '..', 'ext', 'spec', 'specs', "#{name}.yml")
+  return YAML.load_file(file)['tests']
+end
+
+describe "Mustache Spec compliance" do
+  before(:all) do
+    @mustache = File.read(__DIR__ + "/../mustache.js")
+  end
+
+  testnames.each do |testname|
+    load_tests(__DIR__, testname).each do |test|
+      describe test['name'] do
+        it test['desc'] do
+          runner = <<-JS
+            #{@mustache}
+            print(Mustache.to_html(
+              #{test['template'].to_json},
+              #{test['data'].to_json},
+              #{test['partials'].to_json}
+            ));
+          JS
+
+          # #print appends a newline
+          run_js(runner).should == test['expected'] + "\n"
+        end
+      end
+    end
+  end
+
+  def run_js(js)
+    File.open("runner.js", 'w') {|f| f << js}
+    `js runner.js`
+  end
+end