disallow unstub! on any_instance

lib/rspec/mocks/any_instance/recorder.rb

@@ -91,6 +91,11 @@ def stub!(*)
           raise "stub! is not supported on any_instance. Use stub instead."
         end
 
+        # @private
+        def unstub!(*)
+          raise "unstub! is not supported on any_instance. Use unstub instead."
+        end
+
         # @private
         def stop_all_observation!
           @observed_methods.each {|method_name| restore_method!(method_name)}

spec/rspec/mocks/any_instance_spec.rb

@@ -245,6 +245,14 @@ class RSpec::SampleRspecTestClass;end
         end
       end
 
+      context "with #unstub!" do
+        it "raises with a message instructing the user to use unstub instead" do
+          expect do
+            klass.any_instance.unstub!(:foo)
+          end.to raise_error(/Use unstub instead/)
+        end
+      end
+
       context "unstub implementation" do
         it "replaces the stubbed method with the original method" do
           klass.any_instance.stub(:existing_method)