Make the `/groups` route behave as expected

The route is supposed to redirect the Groups#index request based on
whether or not a user was logged in. If they are, we redirect them to
their groups dashboard; if they're not, we redirect them to the public
Explore page.

But due to overly aggressive `before_action`s that weren't excluding the
`index` action, the request always resulted in a 404, whether a user was
logged in or not.

Closes #12660

1 files changed, 23 insertions, 0 deletions

diff --git a/spec/controllers/groups_controller_spec.rb b/spec/controllers/groups_controller_spec.rb
new file mode 100644
index 00000000000..938e97298b6
--- /dev/null
+++ b/spec/controllers/groups_controller_spec.rb
@@ -0,0 +1,23 @@
+require 'rails_helper'
+
+describe GroupsController do
+  describe 'GET index' do
+    context 'as a user' do
+      it 'redirects to Groups Dashboard' do
+        sign_in(create(:user))
+
+        get :index
+
+        expect(response).to redirect_to(dashboard_groups_path)
+      end
+    end
+
+    context 'as a guest' do
+      it 'redirects to Explore Groups' do
+        get :index
+
+        expect(response).to redirect_to(explore_groups_path)
+      end
+    end
+  end
+end