chore: add unit tests for rbenv::rubygems

Author: moritz-makandra

spec/defines/rbenv__rubygems_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'rbenv::rubygems', type: :define do
+  let(:version) { '3.3.7' }
+  let(:user)    { 'tester' }
+  let(:home)    { "/home/#{user}" }
+  let(:ruby)    { '3.1.1' }
+
+  on_supported_os.each do |os, os_facts|
+    let(:facts) { os_facts }
+    let(:pre_condition) do
+      <<~PP
+        exec { "rbenv::compile #{user} #{ruby}":
+          command => true,
+        }
+      PP
+    end
+
+    let(:title)   { "rbenv::rubygems #{user} #{ruby}" }
+    let(:params)  { { version: version, user: user, home: home, ruby: ruby } }
+
+    context "on #{os}" do
+      it 'updates rubygems to 3.3.7' do
+        should contain_exec('update_rubygems_tester_3.3.7').with(
+          command: "/home/#{user}/.rbenv/shims/gem update --system #{version}",
+          unless: "/home/#{user}/.rbenv/shims/gem -v | /bin/grep #{version}",
+          user: user,
+          cwd: home,
+          environment: "HOME=#{home}"
+        )
+      end
+    end
+  end
+end