Upgrade to Rails 6.0 and apply new framework defaults

spec/db/seeds_spec.rb

@@ -7,12 +7,18 @@ describe 'seeds' do
 
   before do
     CodeOcean::Application.load_tasks
+
+    # We want to execute the seeds for the dev environment against the test database
     allow(Rails).to receive(:env) { 'development'.inquiry }
+    allow(ActiveRecord::Base).to receive(:establish_connection).and_call_original
+    allow(ActiveRecord::Base).to receive(:establish_connection).with(:development) {
+      ActiveRecord::Base.establish_connection(:test)
+    }
   end
 
   describe 'execute db:seed' do
     it 'collects the test results' do
-      expect { seed }.not_to raise_error(StandardError)
+      expect { seed }.not_to raise_error
     end
   end
 end