Merge pull request #27 from zhouguangming/bug_fixed

感谢修正！不过由于历史遗留原因 lib/qiniu/tokens/qbox_token.rb 尚保留在sdk代码里边但并未实际使用。请求签名认证程序使用的是  
Qiniu::RS::Utils.generate_qbox_signature(url,params) , 所以不影响sdk正常使用。

lib/qiniu/tokens/qbox_token.rb

@@ -29,7 +29,7 @@ module Qiniu
         end
 
         def generate_token
-          encoded_digest = generate_encoded_digest(signature)
+          encoded_digest = generate_encoded_digest(generate_signature)
           %Q(#{@access_key}:#{encoded_digest})
         end
 

spec/qiniu/tokens/qbox_token_spec.rb

@@ -0,0 +1,29 @@
+# -*- encoding: utf-8 -*-
+
+require 'spec_helper'
+require 'qiniu/tokens/qbox_token'
+
+module Qiniu
+  module RS
+    describe QboxToken do
+      before :all do
+        @qbox_token = QboxToken.new(:url => 'www.qiniutek.com?key1=value1',
+                                    :params => { :key2 => 'value2' })
+        @qbox_token.access_key = 'access_key'
+        @qbox_token.secret_key = 'secret_key'
+      end
+
+      context "#generate_token" do
+        it "should generate token" do
+          @qbox_token.generate_token.should_not be_empty
+        end
+      end
+
+      context "#generate_signature" do
+        it "should generate signature" do
+          @qbox_token.generate_signature.should == "www.qiniutek.com?key1=value1\nkey2=value2"
+        end
+      end
+    end
+  end
+end