diff --git a/spec/acceptance/concat_spec.rb b/spec/acceptance/concat_spec.rb
index d2950e7..708559a 100644
--- a/spec/acceptance/concat_spec.rb
+++ b/spec/acceptance/concat_spec.rb
@@ -1,79 +1,82 @@
 require 'spec_helper_acceptance'
 
 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
       apply_manifest(pp, :catch_failures => true)
       apply_manifest(pp, :catch_changes => true)
     end
   end
 
   context 'owner/group' do
     pp = <<-EOS
       include concat::setup
       concat { '#{basedir}/file':
         owner => '#{username}',
         group => '#{groupname}',
         mode  => '0644',
       }
 
       concat::fragment { '1':
         target  => '#{basedir}/file',
         content => '1',
         order   => '01',
       }
 
       concat::fragment { '2':
         target  => '#{basedir}/file',
         content => '2',
         order   => '02',
       }
     EOS
 
     it_behaves_like 'successfully_applied', pp
 
     describe file("#{basedir}/file") do
       it { should be_file }
       it { should be_owned_by username }
       it { should be_grouped_into groupname }
       # XXX file be_mode isn't supported on AIX
       it("should be mode 644", :unless => (fact('osfamily') == "AIX" or UNSUPPORTED_PLATFORMS.include?(fact('osfamily')))) {
         should be_mode 644
       }
       it { should contain '1' }
       it { should contain '2' }
     end
     describe file("#{default.puppet['vardir']}/concat/#{basedir.gsub('/','_')}_file/fragments/01_1") do
       it { should be_file }
       it { should be_owned_by username }
       it { should be_grouped_into groupname }
       # XXX file be_mode isn't supported on AIX
       it("should be mode 644", :unless => (fact('osfamily') == "AIX" or UNSUPPORTED_PLATFORMS.include?(fact('osfamily')))) {
         should be_mode 644
       }
     end
     describe file("#{default.puppet['vardir']}/concat/#{basedir.gsub('/','_')}_file/fragments/02_2") do
       it { should be_file }
       it { should be_owned_by username }
       it { should be_grouped_into groupname }
       # XXX file be_mode isn't supported on AIX
       it("should be mode 644", :unless => (fact('osfamily') == "AIX" or UNSUPPORTED_PLATFORMS.include?(fact('osfamily')))) {
         should be_mode 644
       }
     end
   end
 end
diff --git a/spec/acceptance/fragment_source_spec.rb b/spec/acceptance/fragment_source_spec.rb
index 610ec5c..82a3cba 100644
--- a/spec/acceptance/fragment_source_spec.rb
+++ b/spec/acceptance/fragment_source_spec.rb
@@ -1,150 +1,153 @@
 require 'spec_helper_acceptance'
 
 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
     before(:all) do
       shell("/bin/echo 'file1 contents' > #{basedir}/file1")
       shell("/bin/echo 'file2 contents' > #{basedir}/file2")
     end
 
     pp = <<-EOS
       include concat::setup
       concat { '#{basedir}/foo': }
 
       concat::fragment { '1':
         target  => '#{basedir}/foo',
         source  => '#{basedir}/file1',
       }
       concat::fragment { '2':
         target  => '#{basedir}/foo',
         content => 'string1 contents',
       }
       concat::fragment { '3':
         target  => '#{basedir}/foo',
         source  => '#{basedir}/file2',
       }
     EOS
 
     it 'applies the manifest twice with no stderr' do
       apply_manifest(pp, :catch_failures => true)
       apply_manifest(pp, :catch_changes => true)
     end
 
     describe file("#{basedir}/foo") do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should contain 'string1 contents' }
       it { should contain 'file2 contents' }
     end
   end # should read file fragments from local system
 
   context 'should create files containing first match only.' do
     before(:all) do
       shell("rm -rf #{basedir} #{default.puppet['vardir']}/concat")
       shell("mkdir -p #{basedir}")
       shell("echo 'file1 contents' > #{basedir}/file1")
       shell("echo 'file2 contents' > #{basedir}/file2")
     end
 
     pp = <<-EOS
       include concat::setup
       concat { '#{basedir}/result_file1':
         owner   => '#{username}',
         group   => '#{groupname}',
         mode    => '0644',
       }
       concat { '#{basedir}/result_file2':
         owner   => '#{username}',
         group   => '#{groupname}',
         mode    => '0644',
       }
       concat { '#{basedir}/result_file3':
         owner   => '#{username}',
         group   => '#{groupname}',
         mode    => '0644',
       }
 
       concat::fragment { '1':
         target  => '#{basedir}/result_file1',
         source => [ '#{basedir}/file1', '#{basedir}/file2' ],
         order   => '01',
       }
       concat::fragment { '2':
         target  => '#{basedir}/result_file2',
         source => [ '#{basedir}/file2', '#{basedir}/file1' ],
         order   => '01',
       }
       concat::fragment { '3':
         target  => '#{basedir}/result_file3',
         source => [ '#{basedir}/file1', '#{basedir}/file2' ],
         order   => '01',
       }
     EOS
 
     it 'applies the manifest twice with no stderr' do
       apply_manifest(pp, :catch_failures => true)
       apply_manifest(pp, :catch_changes => true)
     end
     describe file("#{basedir}/result_file1") do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should_not contain 'file2 contents' }
     end
     describe file("#{basedir}/result_file2") do
       it { should be_file }
       it { should contain 'file2 contents' }
       it { should_not contain 'file1 contents' }
     end
     describe file("#{basedir}/result_file3") do
       it { should be_file }
       it { should contain 'file1 contents' }
       it { should_not contain 'file2 contents' }
     end
   end
 
   context 'should fail if no match on source.' do
     before(:all) do
       shell("rm -rf #{basedir} #{default.puppet['vardir']}/concat")
       shell("mkdir -p #{basedir}")
       shell("rm -rf #{basedir}/fail_no_source #{basedir}/nofilehere #{basedir}/nothereeither")
     end
 
     pp = <<-EOS
       include concat::setup
       concat { '#{basedir}/fail_no_source':
         owner   => '#{username}',
         group   => '#{groupname}',
         mode    => '0644',
       }
 
       concat::fragment { '1':
         target  => '#{basedir}/fail_no_source',
         source => [ '#{basedir}/nofilehere', '#{basedir}/nothereeither' ],
         order   => '01',
       }
     EOS
 
     it 'applies the manifest with resource failures' do
       apply_manifest(pp, :expect_failures => true)
     end
     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 }
     end
   end
 end