Mock and stub models shouldn't be blank

lib/rspec/rails/mocks.rb

@@ -81,6 +81,7 @@ def mock_model(string_or_model_class, stubs = {})
         stubs = stubs.reverse_merge(:persisted? => !!stubs[:id])
         stubs = stubs.reverse_merge(:destroyed? => false)
         stubs = stubs.reverse_merge(:marked_for_destruction? => false)
+        stubs = stubs.reverse_merge(:blank? => false)
 
         mock("#{model_class.name}_#{stubs[:id]}", stubs).tap do |m|
           m.extend ActiveModelInstanceMethods
@@ -192,6 +193,7 @@ def stub_model(model_class, stubs={})
             stubs = stubs.reverse_merge(:id => next_id)
             stubs = stubs.reverse_merge(:persisted? => !!stubs[:id])
           end
+          stubs = stubs.reverse_merge(:blank? => false)
           stubs.each do |k,v|
             m.__send__("#{k}=", stubs.delete(k)) if m.respond_to?("#{k}=")
           end

spec/rspec/rails/mocks/mock_model_spec.rb

@@ -260,6 +260,12 @@
     end
   end
 
+  describe "#blank?" do
+    it "is false" do
+      mock_model(MockableModel).should_not be_blank
+    end
+  end
+
   describe "ActiveModel Lint tests" do
     require 'test/unit/assertions'
     require 'active_model/lint'

spec/rspec/rails/mocks/stub_model_spec.rb

@@ -35,6 +35,11 @@
       second.to_param.to_i.should == (first.to_param.to_i + 1)
     end
 
+    describe "#blank?" do
+      it "is false" do
+        stub_model(model_class).should_not be_blank
+      end
+    end
   end
 
   context "with ActiveModel (not ActiveRecord)" do