diff --git a/spec/acceptance/concat_spec.rb b/spec/acceptance/concat_spec.rb
index 8a45e97..3668217 100644
--- a/spec/acceptance/concat_spec.rb
+++ b/spec/acceptance/concat_spec.rb
@@ -1,6 +1,22 @@
 require 'spec_helper_acceptance'
 
-describe 'basic concat test' do
+case fact('osfamily')
+when 'AIX'
+  username  = 'root'
+  groupname = 'system'
+when 'Darwin'
+  username  = 'root'
+  groupname = 'wheel'
+when 'windows'
+  username  = 'Administrator'
+  groupname = 'Administrators'
+else
+  username  = 'root'
+  groupname = 'root'
+end
+
+describe 'basic concat test', :unless => UNSUPPORTED_PLATFORMS.include?(fact('osfamily')) do
+  basedir = default.tmpdir('concat')
 
   shared_examples 'successfully_applied' do |pp|
     it 'applies the manifest twice with no stderr' do
@@ -10,64 +26,64 @@ describe 'basic concat test' do
 
     describe file("#{default['puppetvardir']}/concat") do
       it { should be_directory }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 755 }
     end
     describe file("#{default['puppetvardir']}/concat/bin") do
       it { should be_directory }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 755 }
     end
     describe file("#{default['puppetvardir']}/concat/bin/concatfragments.sh") do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      #it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      #it { should be_grouped_into groupname }
       it { should be_mode 755 }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file") do
       it { should be_directory }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 750 }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments") do
       it { should be_directory }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 750 }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments.concat") do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 640 }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments.concat.out") do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 640 }
     end
   end
 
   context 'owner/group root' do
     pp = <<-EOS
-      concat { '/tmp/concat/file':
-        owner => 'root',
-        group => 'root',
+      concat { '#{basedir}/file':
+        owner => '#{username}',
+        group => '#{groupname}',
         mode  => '0644',
       }
 
       concat::fragment { '1':
-        target  => '/tmp/concat/file',
+        target  => '#{basedir}/file',
         content => '1',
         order   => '01',
       }
 
       concat::fragment { '2':
-        target  => '/tmp/concat/file',
+        target  => '#{basedir}/file',
         content => '2',
         order   => '02',
       }
@@ -75,89 +91,34 @@ describe 'basic concat test' do
 
     it_behaves_like 'successfully_applied', pp
 
-    describe file('/tmp/concat/file') do
+    describe file('#{basedir}/file') do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 644 }
       it { should contain '1' }
       it { should contain '2' }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments/01_1") do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 640 }
     end
     describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments/02_2") do
       it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
+      it { should be_owned_by username }
+      it { should be_grouped_into groupname }
       it { should be_mode 640 }
     end
   end
 
-  context 'owner/group non-root' do
-    before(:all) do
-      shell "groupadd -g 64444 bob"
-      shell "useradd -u 42 -g 64444 bob"
-    end
-    after(:all) do
-      shell "userdel bob"
-    end
-
-    pp="
-      concat { '/tmp/concat/file':
-        owner => 'bob',
-        group => 'bob',
-        mode  => '0644',
-      }
-
-      concat::fragment { '1':
-        target  => '/tmp/concat/file',
-        content => '1',
-        order   => '01',
-      }
-
-      concat::fragment { '2':
-        target  => '/tmp/concat/file',
-        content => '2',
-        order   => '02',
-      }
-    "
-
-    it_behaves_like 'successfully_applied', pp
-
-    describe file('/tmp/concat/file') do
-      it { should be_file }
-      it { should be_owned_by 'bob' }
-      it { should be_grouped_into 'bob' }
-      it { should be_mode 644 }
-      it { should contain '1' }
-      it { should contain '2' }
-    end
-    describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments/01_1") do
-      it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
-      it { should be_mode 640 }
-      it { should contain '1' }
-    end
-    describe file("#{default['puppetvardir']}/concat/_tmp_concat_file/fragments/02_2") do
-      it { should be_file }
-      it { should be_owned_by 'root' }
-      it { should be_grouped_into 'root' }
-      it { should be_mode 640 }
-      it { should contain '2' }
-    end
-  end
-
   context 'ensure' do
     context 'works when set to present with path set' do
       pp="
         concat { 'file':
           ensure => present,
-          path   => '/tmp/concat/file',
+          path   => '#{basedir}/file',
           mode   => '0644',
         }
         concat::fragment { '1':
@@ -169,7 +130,7 @@ describe 'basic concat test' do
 
       it_behaves_like 'successfully_applied', pp
 
-      describe file('/tmp/concat/file') do
+      describe file('#{basedir}/file') do
         it { should be_file }
         it { should be_mode 644 }
         it { should contain '1' }
@@ -179,7 +140,7 @@ describe 'basic concat test' do
       pp="
         concat { 'file':
           ensure => absent,
-          path   => '/tmp/concat/file',
+          path   => '#{basedir}/file',
           mode   => '0644',
         }
         concat::fragment { '1':
@@ -193,10 +154,10 @@ describe 'basic concat test' do
       # absent is set.
       it 'applies the manifest twice with no stderr' do
         apply_manifest(pp, :catch_failures => true)
-        apply_manifest(pp, :catch_failures => true)
+        apply_manifest(pp, :catch_changes => true)
       end
 
-      describe file('/tmp/concat/file') do
+      describe file('#{basedir}/file') do
         it { should_not be_file }
       end
     end
diff --git a/spec/acceptance/fragment_source_spec.rb b/spec/acceptance/fragment_source_spec.rb
index 7edd380..9c5427a 100644
--- a/spec/acceptance/fragment_source_spec.rb
+++ b/spec/acceptance/fragment_source_spec.rb
@@ -1,26 +1,45 @@
 require 'spec_helper_acceptance'
 
-describe 'concat::fragment source' do
-  context 'should read file fragments from local system' do
-    before(:all) do
-      shell("/bin/echo 'file1 contents' > /tmp/concat/file1")
-      shell("/bin/echo 'file2 contents' > /tmp/concat/file2")
-    end
+case fact('osfamily')
+when 'AIX'
+  username  = 'root'
+  groupname = 'system'
+when 'Darwin'
+  username  = 'root'
+  groupname = 'wheel'
+when 'windows'
+  username  = 'Administrator'
+  groupname = 'Administrators'
+else
+  username  = 'root'
+  groupname = 'root'
+end
 
+describe 'concat::fragment source', :unless => UNSUPPORTED_PLATFORMS.include?(fact('osfamily')) do
+  basedir = default.tmpdir('concat')
+  context 'should read file fragments from local system' do
     pp = <<-EOS
-      concat { '/tmp/concat/foo': }
+      file { '#{basedir}/file1':
+        content => "file1 contents\n"
+      }
+      file { '#{basedir}/file2':
+        content => "file2 contents\n"
+      }
+      concat { '#{basedir}/foo': }
 
       concat::fragment { '1':
-        target  => '/tmp/concat/foo',
-        source  => '/tmp/concat/file1',
+        target  => '#{basedir}/foo',
+        source  => '#{basedir}/file1',
+        require => File['#{basedir}/file1'],
       }
       concat::fragment { '2':
-        target  => '/tmp/concat/foo',
+        target  => '#{basedir}/foo',
         content => 'string1 contents',
       }
       concat::fragment { '3':
-        target  => '/tmp/concat/foo',
-        source  => '/tmp/concat/file2',
+        target  => '#{basedir}/foo',
+        source  => '#{basedir}/file2',
+        require => File['#{basedir}/file2'],
       }
     EOS
 
@@ -29,7 +48,7 @@ describe 'concat::fragment source' do
       apply_manifest(pp, :catch_changes => true)
     end
 
-    describe file('/tmp/concat/foo') do
+    describe file('#{basedir}/foo') do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should contain 'string1 contents' }
@@ -38,43 +57,45 @@ describe 'concat::fragment source' do
   end # should read file fragments from local system
 
   context 'should create files containing first match only.' do
-    before(:all) do
-      shell('rm -rf /tmp/concat /var/lib/puppet/concat')
-      shell('mkdir -p /tmp/concat')
-      shell("/bin/echo 'file1 contents' > /tmp/concat/file1")
-      shell("/bin/echo 'file2 contents' > /tmp/concat/file2")
-    end
-
     pp = <<-EOS
-      concat { '/tmp/concat/result_file1':
-        owner   => root,
-        group   => root,
+      file { '#{basedir}/file1':
+        content => "file1 contents\n"
+      }
+      file { '#{basedir}/file2':
+        content => "file2 contents\n"
+      }
+      concat { '#{basedir}/result_file1':
+        owner   => '#{username}',
+        group   => '#{groupname}',
         mode    => '0644',
       }
-      concat { '/tmp/concat/result_file2':
-        owner   => root,
-        group   => root,
+      concat { '#{basedir}/result_file2':
+        owner   => '#{username}',
+        group   => '#{groupname}',
         mode    => '0644',
       }
-      concat { '/tmp/concat/result_file3':
-        owner   => root,
-        group   => root,
+      concat { '#{basedir}/result_file3':
+        owner   => '#{username}',
+        group   => '#{groupname}',
         mode    => '0644',
       }
 
       concat::fragment { '1':
-        target  => '/tmp/concat/result_file1',
-        source => [ '/tmp/concat/file1', '/tmp/concat/file2' ],
+        target  => '#{basedir}/result_file1',
+        source  => [ '#{basedir}/file1', '#{basedir}/file2' ],
+        require => [ File['#{basedir}/file1'], File['#{basedir}/file2'] ],
         order   => '01',
       }
       concat::fragment { '2':
-        target  => '/tmp/concat/result_file2',
-        source => [ '/tmp/concat/file2', '/tmp/concat/file1' ],
+        target  => '#{basedir}/result_file2',
+        source  => [ '#{basedir}/file2', '#{basedir}/file1' ],
+        require => [ File['#{basedir}/file1'], File['#{basedir}/file2'] ],
         order   => '01',
       }
       concat::fragment { '3':
-        target  => '/tmp/concat/result_file3',
-        source => [ '/tmp/concat/file1', '/tmp/concat/file2' ],
+        target  => '#{basedir}/result_file3',
+        source  => [ '#{basedir}/file1', '#{basedir}/file2' ],
+        require => [ File['#{basedir}/file1'], File['#{basedir}/file2'] ],
         order   => '01',
       }
     EOS
@@ -83,17 +104,17 @@ describe 'concat::fragment source' do
       apply_manifest(pp, :catch_failures => true)
       apply_manifest(pp, :catch_changes => true)
     end
-    describe file('/tmp/concat/result_file1') do
+    describe file('#{basedir}/result_file1') do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should_not contain 'file2 contents' }
     end
-    describe file('/tmp/concat/result_file2') do
+    describe file('#{basedir}/result_file2') do
       it { should be_file }
       it { should contain 'file2 contents' }
       it { should_not contain 'file1 contents' }
     end
-    describe file('/tmp/concat/result_file3') do
+    describe file('#{basedir}/result_file3') do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should_not contain 'file2 contents' }
@@ -101,22 +122,16 @@ describe 'concat::fragment source' do
   end
 
   context 'should fail if no match on source.' do
-    before(:all) do
-      shell('rm -rf /tmp/concat /var/lib/puppet/concat')
-      shell('mkdir -p /tmp/concat')
-      shell('/bin/rm -rf /tmp/concat/fail_no_source /tmp/concat/nofilehere /tmp/concat/nothereeither')
-    end
-
     pp = <<-EOS
-      concat { '/tmp/concat/fail_no_source':
-        owner   => root,
-        group   => root,
+      concat { '#{basedir}/fail_no_source':
+        owner   => '#{username}',
+        group   => '#{groupname}',
         mode    => '0644',
       }
 
       concat::fragment { '1':
-        target  => '/tmp/concat/fail_no_source',
-        source => [ '/tmp/concat/nofilehere', '/tmp/concat/nothereeither' ],
+        target  => '#{basedir}/fail_no_source',
+        source => [ '#{basedir}/nofilehere', '#{basedir}/nothereeither' ],
         order   => '01',
       }
     EOS
@@ -124,7 +139,7 @@ describe 'concat::fragment source' do
     it 'applies the manifest with resource failures' do
       apply_manifest(pp, :expect_failures => true)
     end
-    describe file('/tmp/concat/fail_no_source') do
+    describe file('#{basedir}/fail_no_source') do
       #FIXME: Serverspec::Type::File doesn't support exists? for some reason. so... hack.
       it { should_not be_file }
       it { should_not be_directory }