Test that invoked generators actually exist

Author: joaquintomas2003

spec/generators/devise/webauthn/install_generator_spec.rb

@@ -35,6 +35,14 @@
       expect(generator).to have_received(:invoke)
         .with("devise:webauthn:javascript")
     end
+
+    # rubocop:disable Rails/DynamicFindBy
+    it "invoked generators are findable" do
+      expect(Rails::Generators.find_by_namespace("devise:webauthn:webauthn_credential_model")).not_to be_nil
+      expect(Rails::Generators.find_by_namespace("devise:webauthn:webauthn_id")).not_to be_nil
+      expect(Rails::Generators.find_by_namespace("devise:webauthn:javascript")).not_to be_nil
+    end
+    # rubocop:enable Rails/DynamicFindBy
   end
 
   context "when using a custom resource name" do