diff --git a/spec/unit/util/adsi_spec.rb b/spec/unit/util/adsi_spec.rb
old mode 100644
new mode 100755
index b61724405..3a27cdaef
--- a/spec/unit/util/adsi_spec.rb
+++ b/spec/unit/util/adsi_spec.rb
@@ -1,202 +1,206 @@
 #!/usr/bin/env ruby
 
 require 'spec_helper'
 
 require 'puppet/util/adsi'
 
 describe Puppet::Util::ADSI do
   let(:connection) { stub 'connection' }
 
   before(:each) do
     Puppet::Util::ADSI.instance_variable_set(:@computer_name, 'testcomputername')
     Puppet::Util::ADSI.stubs(:connect).returns connection
   end
 
+  after(:each) do
+    Puppet::Util::ADSI.instance_variable_set(:@computer_name, nil)
+  end
+
   it "should generate the correct URI for a resource" do
     Puppet::Util::ADSI.uri('test', 'user').should == "WinNT://testcomputername/test,user"
   end
 
   it "should be able to get the name of the computer" do
     Puppet::Util::ADSI.computer_name.should == 'testcomputername'
   end
 
   it "should be able to provide the correct WinNT base URI for the computer" do
     Puppet::Util::ADSI.computer_uri.should == "WinNT://testcomputername"
   end
 
   describe Puppet::Util::ADSI::User do
     let(:username)  { 'testuser' }
 
     it "should generate the correct URI" do
       Puppet::Util::ADSI::User.uri(username).should == "WinNT://testcomputername/#{username},user"
     end
 
     it "should be able to create a user" do
       adsi_user = stub('adsi')
 
       connection.expects(:Create).with('user', username).returns(adsi_user)
 
       user = Puppet::Util::ADSI::User.create(username)
 
       user.should be_a(Puppet::Util::ADSI::User)
       user.native_user.should == adsi_user
     end
 
     it "should be able to check the existence of a user" do
       Puppet::Util::ADSI.expects(:connect).with("WinNT://testcomputername/#{username},user").returns connection
       Puppet::Util::ADSI::User.exists?(username).should be_true
     end
 
     it "should be able to delete a user" do
       connection.expects(:Delete).with('user', username)
 
       Puppet::Util::ADSI::User.delete(username)
     end
 
     describe "an instance" do
       let(:adsi_user) { stub 'user' }
       let(:user)      { Puppet::Util::ADSI::User.new(username, adsi_user) }
 
       it "should provide its groups as a list of names" do
         names = ["group1", "group2"]
 
         groups = names.map { |name| mock('group', :Name => name) }
 
         adsi_user.expects(:Groups).returns(groups)
 
         user.groups.should =~ names
       end
 
       it "should be able to test whether a given password is correct" do
         Puppet::Util::ADSI::User.expects(:logon).with(username, 'pwdwrong').returns(false)
         Puppet::Util::ADSI::User.expects(:logon).with(username, 'pwdright').returns(true)
 
         user.password_is?('pwdwrong').should be_false
         user.password_is?('pwdright').should be_true
       end
 
       it "should be able to set a password" do
         adsi_user.expects(:SetPassword).with('pwd')
         adsi_user.expects(:SetInfo).at_least_once
 
         flagname = "UserFlags"
         fADS_UF_DONT_EXPIRE_PASSWD = 0x10000
 
         adsi_user.expects(:Get).with(flagname).returns(0)
         adsi_user.expects(:Put).with(flagname, fADS_UF_DONT_EXPIRE_PASSWD)
 
         user.password = 'pwd'
       end
 
       it "should generate the correct URI" do
         user.uri.should == "WinNT://testcomputername/#{username},user"
       end
 
       describe "when given a set of groups to which to add the user" do
         let(:groups_to_set) { 'group1,group2' }
 
         before(:each) do
           user.expects(:groups).returns ['group2', 'group3']
         end
 
         describe "if membership is specified as inclusive" do
           it "should add the user to those groups, and remove it from groups not in the list" do
             group1 = stub 'group1'
             group1.expects(:Add).with("WinNT://testcomputername/#{username},user")
 
             group3 = stub 'group1'
             group3.expects(:Remove).with("WinNT://testcomputername/#{username},user")
 
             Puppet::Util::ADSI.expects(:connect).with('WinNT://testcomputername/group1,group').returns group1
             Puppet::Util::ADSI.expects(:connect).with('WinNT://testcomputername/group3,group').returns group3
 
             user.set_groups(groups_to_set, false)
           end
         end
 
         describe "if membership is specified as minimum" do
           it "should add the user to the specified groups without affecting its other memberships" do
             group1 = stub 'group1'
             group1.expects(:Add).with("WinNT://testcomputername/#{username},user")
 
             Puppet::Util::ADSI.expects(:connect).with('WinNT://testcomputername/group1,group').returns group1
 
             user.set_groups(groups_to_set, true)
           end
         end
       end
     end
   end
 
   describe Puppet::Util::ADSI::Group do
     let(:groupname)  { 'testgroup' }
 
     describe "an instance" do
       let(:adsi_group) { stub 'group' }
       let(:group)      { Puppet::Util::ADSI::Group.new(groupname, adsi_group) }
 
       it "should be able to add a member" do
         adsi_group.expects(:Add).with("WinNT://testcomputername/someone,user")
 
         group.add_member('someone')
       end
 
       it "should be able to remove a member" do
         adsi_group.expects(:Remove).with("WinNT://testcomputername/someone,user")
 
         group.remove_member('someone')
       end
 
       it "should provide its groups as a list of names" do
         names = ['user1', 'user2']
 
         users = names.map { |name| mock('user', :Name => name) }
 
         adsi_group.expects(:Members).returns(users)
 
         group.members.should =~ names
       end
 
       it "should be able to add a list of users to a group" do
         names = ['user1', 'user2']
         adsi_group.expects(:Members).returns names.map{|n| stub(:Name => n)}
 
         adsi_group.expects(:Remove).with('WinNT://testcomputername/user1,user')
         adsi_group.expects(:Add).with('WinNT://testcomputername/user3,user')
 
         group.set_members(['user2', 'user3'])
       end
 
       it "should generate the correct URI" do
         group.uri.should == "WinNT://testcomputername/#{groupname},group"
       end
     end
 
     it "should generate the correct URI" do
       Puppet::Util::ADSI::Group.uri("people").should == "WinNT://testcomputername/people,group"
     end
 
     it "should be able to create a group" do
       adsi_group = stub("adsi")
 
       connection.expects(:Create).with('group', groupname).returns(adsi_group)
 
       group = Puppet::Util::ADSI::Group.create(groupname)
 
       group.should be_a(Puppet::Util::ADSI::Group)
       group.native_group.should == adsi_group
     end
 
     it "should be able to confirm the existence of a group" do
       Puppet::Util::ADSI.expects(:connect).with("WinNT://testcomputername/#{groupname},group").returns connection
 
       Puppet::Util::ADSI::Group.exists?(groupname).should be_true
     end
 
     it "should be able to delete a group" do
       connection.expects(:Delete).with('group', groupname)
 
       Puppet::Util::ADSI::Group.delete(groupname)
     end
   end
 end