1 files changed, 14 insertions, 1 deletions
diff --git a/spec/graphql/resolvers/design_management/design_resolver_spec.rb b/spec/graphql/resolvers/design_management/design_resolver_spec.rb
index 02d7f94612c..e33eaedf167 100644
--- a/spec/graphql/resolvers/design_management/design_resolver_spec.rb
+++ b/spec/graphql/resolvers/design_management/design_resolver_spec.rb
@@ -6,6 +6,10 @@ RSpec.describe Resolvers::DesignManagement::DesignResolver do
   include GraphqlHelpers
   include DesignManagementTestHelpers
 
+  specify do
+    expect(described_class).to have_nullable_graphql_type(::Types::DesignManagement::DesignType)
+  end
+
   before do
     enable_design_management
   end
@@ -57,12 +61,21 @@ RSpec.describe Resolvers::DesignManagement::DesignResolver do
       end
 
       context 'the ID belongs to a design on another issue' do
-        let(:args) { { id: GitlabSchema.id_from_object(design_on_other_issue).to_s } }
+        let(:args) { { id: global_id_of(design_on_other_issue) } }
 
         it 'returns nothing' do
           expect(resolve_design).to be_nil
         end
       end
+
+      context 'the ID does not belong to a design at all' do
+        let(:args) { { id: global_id_of(issue) } }
+        let(:msg) { /does not represent an instance of DesignManagement::Design/ }
+
+        it 'complains meaningfully' do
+          expect { resolve_design }.to raise_error(msg)
+        end
+      end
     end
 
     context 'by filename' do