diff --git a/spec/unit/classes/server/contrib_spec.rb b/spec/unit/classes/server/contrib_spec.rb
index 8f87929..33f11c9 100644
--- a/spec/unit/classes/server/contrib_spec.rb
+++ b/spec/unit/classes/server/contrib_spec.rb
@@ -1,46 +1,79 @@
 # frozen_string_literal: true
 
 require 'spec_helper'
 
 describe 'postgresql::server::contrib', type: :class do
   let :pre_condition do
     "class { 'postgresql::server': }"
   end
 
   let :facts do
     {
       os: {
         family: 'RedHat',
         name: 'RedHat',
         release: { 'major' => '8' },
         selinux: {
           enabled: false,
         },
       },
       kernel: 'Linux',
       id: 'root',
       path: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
     }
   end
 
   describe 'with parameters' do
     let(:params) do
       {
         package_name: 'mypackage',
         package_ensure: 'absent',
       }
     end
 
     it 'creates package with correct params' do
       is_expected.to contain_package('postgresql-contrib').with(ensure: 'absent',
                                                                 name: 'mypackage',
                                                                 tag: 'puppetlabs-postgresql')
     end
   end
 
   describe 'with no parameters' do
     it 'creates package with postgresql tag' do
       is_expected.to contain_package('postgresql-contrib').with(tag: 'puppetlabs-postgresql')
     end
   end
+
+  describe 'on Gentoo' do
+    let :facts do
+      {
+        os: {
+          family: 'Gentoo',
+          name: 'Gentoo',
+        },
+      }
+    end
+
+    it 'postgresql-contrib should not be installed' do
+      is_expected.to compile
+      is_expected.not_to contain_package('postgresql-contrib')
+    end
+  end
+
+  describe 'on Debian' do
+    let :facts do
+      {
+        os: {
+          family: 'Debian',
+          name: 'Debian',
+          release: { 'full' => '8.0', 'major' => '8' },
+        },
+      }
+    end
+
+    it 'postgresql-contrib should not be installed' do
+      is_expected.to compile
+      is_expected.not_to contain_package('postgresql-contrib')
+    end
+  end
 end