describe Rack::Contrib::ContentHash do
  let (:response) { [200, {'Location' => 'lolwhat'}, 'foobar-body'] }
  let (:response_clone) { [200, {'Location' => 'lolwhat'}, 'foobar-body'] }
  describe "#initialize" do
    it "accepts an app" do
      expect { ware  = Rack::Contrib::ContentHash.new nil }.not_to raise_error
    end

    it "requires an app" do
      expect { ware = Rack::Contrib::ContentHash.new }.to raise_error
    end

    it "accepts a hash of enabled algorithms" do
      expect {
        ware = Rack::Contrib::ContentHash.new nil, md5: true
      }.not_to raise_error
    end
  end

  describe "#call" do
    it "requires an env" do
      ware = Rack::Contrib::ContentHash.new nil
      expect { ware.call }.to raise_error
    end

    it "calls the app's .call method" do
      app = double(nil, call: response)
      env = {'foo' => 'bar'}
      ware = Rack::Contrib::ContentHash.new app
      ware.call env

      app.should have_received(:call).once.with(env)
    end

    context "all hashing is disabled" do
      it "returns the same data from the app" do
        app = double(nil, call: response)
        env = {}
        ware = Rack::Contrib::ContentHash.new app
        ware.call(env).should eq(response_clone)
      end
    end

    context "MD5 hashing is enabled" do
      it "hashes the body, and adds a Content-MD5 header" do
        app = double(nil, call: response)
        env = {}
        ware = Rack::Contrib::ContentHash.new app, md5: true

        response_clone[1]['Content-MD5'] = '58110b6c0b6880db960c1f19e73feb9a'
        ware.call(env).should eq(response_clone)
      end
    end

    context "SHA1 hashing is enabled" do
      it "hashes the body, and adds a Content-SHA1 header" do
        app = double(nil, call: response)
        env = {}
        ware = Rack::Contrib::ContentHash.new app, sha1: true

        response_clone[1]['Content-SHA1'] = 'e04ce9c63d277c7714f71d916461959710b761f2'
        ware.call(env).should eq(response_clone)
      end
    end

    context "SHA1 and MD5 hashing are both enabled" do
      it "hashes the body, and adds a Content-SHA1 and Content-MD5 header" do
        app = double(nil, call: response)
        env = {}
        ware = Rack::Contrib::ContentHash.new app, sha1: true, md5: true

        response_clone[1]['Content-SHA1'] = 'e04ce9c63d277c7714f71d916461959710b761f2'
        response_clone[1]['Content-MD5'] = '58110b6c0b6880db960c1f19e73feb9a'
        ware.call(env).should eq(response_clone)
      end
    end
  end
end