!16 修复运行单个单元测试时，获取OpenAuth.WebApi配置文件路径异常的问题。

Merge pull request !16 from sesamefly/N/A

OpenAuth.Repository/Test/TestBase.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -39,7 +39,7 @@ namespace OpenAuth.Repository.Test
             //模拟配置文件
             //读取OpenAuth.WebApi的配置文件用于单元测试
             var path = AppContext.BaseDirectory;
-            int pos = path.IndexOf("OpenAuth.Repository");
+            int pos =  path.LastIndexOf("OpenAuth.");
             var basepath = Path.Combine(path.Substring(0,pos) ,"OpenAuth.WebApi");
             IConfiguration config = new ConfigurationBuilder()
                 .SetBasePath(basepath)