(CONT-588) - allow deferred function for change

lib/puppet/functions/tomcat/change.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# This function exists for usage of a returning the input params that is a deferred function
+# Will be used for deferring the values at agent level
+Puppet::Functions.create_function(:'tomcat::change') do
+  dispatch :change do
+    param 'Any', :arg
+    return_type 'Any'
+  end
+
+  def change(arg)
+    arg
+  end
+end

manifests/config/server/tomcat_users.pp

@@ -103,7 +103,7 @@
   augeas { "${catalina_base}-tomcat_users-${element}-${_element_name}-${name}":
     lens      => 'Xml.lns',
     incl      => $_file,
-    changes   => $changes,
+    changes   => Deferred('tomcat::change', [$changes]),
     show_diff => $show_diff,
   }
 }

spec/functions/change_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'tomcat::change' do
+  it { is_expected.to run.with_params(nil).and_return(nil) }
+  it { is_expected.to run.with_params(2).and_return(2) }
+  it { is_expected.to run.with_params('').and_return('') }
+  it { is_expected.to run.with_params('string').and_return('string') }
+  it { is_expected.to run.with_params(['abc', 2]).and_return(['abc', 2]) }
+end