diff --git a/spec/spectator/mocks/mock_spec.cr b/spec/spectator/mocks/mock_spec.cr
index 54bed0b..202d8ea 100644
--- a/spec/spectator/mocks/mock_spec.cr
+++ b/spec/spectator/mocks/mock_spec.cr
@@ -33,6 +33,10 @@ Spectator.describe Spectator::Mock do
         expect(MockThing).to be_lt(Thing)
       end
 
+      it "defines a class" do
+        expect(MockThing).to be_lt(::Reference)
+      end
+
       it "overrides responses from methods with keyword arguments" do
         expect(mock.method1).to eq(123)
       end
@@ -95,6 +99,10 @@ Spectator.describe Spectator::Mock do
         expect(MockThing).to be_lt(Thing)
       end
 
+      it "defines a class" do
+        expect(MockThing).to be_lt(::Reference)
+      end
+
       it "overrides responses from methods defined in the block" do
         expect(mock.method1).to eq(123)
       end