Fix ruby syntax according to the PDK validation

spec/classes/init_spec.rb

@@ -1,39 +1,37 @@
 require 'spec_helper'
 
 describe 'nslcd' do
-
   { 'Ubuntu' => 'Debian', 'Debian' => 'Debian', 'CentOS' => 'RedHat', 'RedHat' => 'RedHat' }.each do |system, family|
     context "when on system #{system}" do
       facts = {
-          :osfamily        => family,
+        osfamily: family,
-          :operatingsystem => system,
+        operatingsystem: system,
       }
       let :facts do
         facts
       end
 
-      it { should contain_class('nslcd') }
+      it { is_expected.to contain_class('nslcd') }
-      it { should contain_class('nslcd::install') }
+      it { is_expected.to contain_class('nslcd::install') }
-      it { should contain_class('nslcd::config') }
+      it { is_expected.to contain_class('nslcd::config') }
-      it { should contain_class('nslcd::service') }
+      it { is_expected.to contain_class('nslcd::service') }
-
 
       case facts[:osfamily]
       when 'Debian'
         it {
-          should contain_package('nslcd')
+          is_expected.to contain_package('nslcd')
-          should contain_service('nslcd')
+          is_expected.to contain_service('nslcd')
         }
       when 'RedHat'
         it {
-          should contain_package('nss-pam-ldapd')
+          is_expected.to contain_package('nss-pam-ldapd')
-          should contain_service('nslcd')
+          is_expected.to contain_service('nslcd')
         }
       end
     end
   end
 
   context 'when on an unknown system' do
-    it { expect { should raise_error(Puppet::Error) } }
+    it { is_expected.to raise_error(Puppet::Error) }
   end
 end