Acceptance test: Install pip

First part of regression test for PR#418

Author: Feandil

spec/acceptance/virtualenv_spec.rb

@@ -29,5 +29,30 @@ class { 'python' :
       apply_manifest(pp, catch_failures: true)
       apply_manifest(pp, catch_changes: true)
     end
+    it 'maintains pip version' do
+      pp = <<-EOS
+      class { 'python' :
+        version    => 'system',
+        pip        => 'present',
+        virtualenv => 'present',
+      }
+      ->
+      python::virtualenv { 'venv' :
+        ensure     => 'present',
+        systempkgs => false,
+        venv_dir   => '/opt/venv2',
+        owner      => 'root',
+        group      => 'root',
+      }
+      ->
+      python::pip { 'pip' :
+        ensure     => '18.0',
+        virtualenv => '/opt/venv2',
+      }
+      EOS
+
+      # Run it twice and test for idempotency
+      apply_manifest(pp, catch_failures: true)
+    end
   end
 end