Enable OmniAuth testing in RSpec tests

- Created `spec/support/helpers/omniauth_helper.rb` for simulating authentication with providers like Shibboleth
- Added OmniAuth test config settings in `spec/rails_helper.rb`.

Author: aaronskiba

spec/rails_helper.rb

@@ -79,4 +79,9 @@
   config.include Devise::Test::ControllerHelpers, type: :controller
   config.include Devise::Test::ControllerHelpers, type: :view
   config.include Pundit::Matchers, type: :policy
+
+  # Enable test mode for OmniAuth
+  OmniAuth.config.test_mode = true
+  # Set the full host to nil to avoid URL generation issues in tests
+  OmniAuth.config.full_host = nil
 end

spec/support/helpers/omniauth_helper.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Helper module for mocking OmniAuth authentication in tests
+module OmniAuthHelper
+  # This method sets and returns an OmniAuth::AuthHash
+  # that simulates the authentication data returned by
+  # an OmniAuth provider (e.g. Shibboleth).
+  def mock_auth_hash(user, scheme)
+    Rails.application.env_config['omniauth.auth'] =
+      OmniAuth::AuthHash.new({
+                               provider: scheme.name,
+                               uid: '12345',
+                               info: {
+                                 email: user.email,
+                                 first_name: user.firstname,
+                                 last_name: user.surname
+                               }
+                             })
+    Rails.application.env_config['omniauth.auth']
+  end
+end