会员提供商的集成测试

Question

我试图在会员提供商上进行集成测试......看起来像这样：

[TestClass]
public class UnitTestMembershipProvider
{
    [TestMethod]
    public void Are_There_Membership_Users()
    {
        // Arrange
        MembershipUserCollection users = Membership.GetAllUsers();

        //Assert
        Assert.IsTrue(users.Count > 0);
    }
}

为什么我会得到以下结果？

Test Name:  Are_There_Membership_Users
Test FullName:  Something.UnitTests.Controllers.UnitTestMembershipProvider.Are_There_Membership_Users
Test Source:    c:\Users\James\Source\Workspaces\Something\Something.UnitTests\Controllers\UnitTestMembershipProvider.cs : line 12
Test Outcome:   Failed
Test Duration:  0:00:00.0298722

Result Message: 
Test method Something.UnitTests.Controllers.UnitTestMembershipProvider.Are_There_Membership_Users threw exception: 
System.UnauthorizedAccessException: Access to the path 'C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 12.0\COMMON7\IDE\COMMONEXTENSIONS\MICROSOFT\TESTWINDOW\App_Data' is denied.
Result StackTrace:  
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, Object dirSecurityObj, Boolean checkHost)
   at System.IO.Directory.InternalCreateDirectoryHelper(String path, Boolean checkHost)
   at System.IO.Directory.CreateDirectory(String path)
   at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString)
   at System.Web.DataAccess.SqlConnectionHelper.EnsureDBFile(String connectionString)
   at System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation)
   at System.Web.Security.SqlMembershipProvider.GetAllUsers(Int32 pageIndex, Int32 pageSize, Int32& totalRecords)
   at System.Web.Security.Membership.GetAllUsers(Int32 pageIndex, Int32 pageSize, Int32& totalRecords)
   at System.Web.Security.Membership.GetAllUsers()
   at Something.UnitTests.Controllers.UnitTestMembershipProvider.Are_There_Membership_Users() in c:\Users\James\Source\Workspaces\Something\Something.UnitTests\Controllers\UnitTestMembershipProvider.cs:line 14