Add Test::Integration::Mattermost

Here we add a new entrypoint for the test suite,
Test::Integration::Mattermost.  It is to ensure that mattermost
integration is working when enabling the embedded mattermost of
gitlab-omnibus

It runs all the example groups from Test::Instance, in addition to any
groups tagged :mattermost

* Extracts a common entrypoint class from Test::Instance as
  Scenario::Entrypoint, and uses that as the base for Test::Instance and
  Test::Integration::Mattermost

* RSpec groups defined in `specs/features/mattermost/**_spec.rb` are
  tagged with :mattermost so they can be filtered out of the default
  run.

* Tests tagged :mattermost are filtered out by default, and are
  un-filtered by Test::Integration::Mattermost

1 files changed, 5 insertions, 0 deletions

diff --git a/qa/qa.rb b/qa/qa.rb
index eb6f922d0d3..59d9dd131c2 100644
--- a/qa/qa.rb
+++ b/qa/qa.rb
@@ -18,6 +18,7 @@ module QA
     # Support files
     #
     autoload :Actable, 'qa/scenario/actable'
+    autoload :Entrypoint, 'qa/scenario/entrypoint'
     autoload :Template, 'qa/scenario/template'
 
     ##
@@ -25,6 +26,10 @@ module QA
     #
     module Test
       autoload :Instance, 'qa/scenario/test/instance'
+
+      module Integration
+        autoload :Mattermost, 'qa/scenario/test/integration/mattermost'
+      end
     end
 
     ##