add stub request

engines/instance_verification/spec/requests/api/connect/v3/systems/products_controller_spec.rb

@@ -86,6 +86,13 @@
 
         context 'when verification provider raises an unhandled exception' do
           before do
+            stub_request(:post, scc_activate_url)
+            .to_return(
+              status: 422,
+              body: { error: 'Unexpected instance verification error has occurred' }.to_json,
+              headers: {}
+            )
+
             expect(InstanceVerification::Providers::Example).to receive(:new)
               .with(be_a(ActiveSupport::Logger), be_a(ActionDispatch::Request), payload, instance_data).and_return(plugin_double)
             expect(plugin_double).to receive(:instance_valid?).and_raise('Custom plugin error')