Add failing specs for association_matcher autosave

has_one, has_many, belongs_to, and has_and_belongs_to_many relationships can
have an `:autosave` option, which causes the relevant associated records to be
automatically saved when their parent is saved.

I've added failing specs for passing and failing cases for each of these
association types.

https://github.com/rails/rails/blob/master/activerecord/lib/active_record/autosave_association.rb

spec/shoulda/active_record/association_matcher_spec.rb

@@ -98,6 +98,23 @@
       end
       Child.new.should_not @matcher.class_name('TreeChild')
     end
+
+    it "should accept an association with a valid :autosave option" do
+      define_model :parent, :adopter => :boolean
+      define_model :child, :parent_id => :integer do
+        belongs_to :parent, :autosave => true
+      end
+      Child.new.should @matcher.autosave(:true)
+    end
+
+    it "should reject an association with a valid :autosave option" do
+      define_model :parent, :adopter => :boolean
+      define_model :child, :parent_id => :integer do
+        belongs_to :parent, :autosave => false
+      end
+      Child.new.should_not @matcher.autosave(:true)
+    end
+
   end
 
   context "have_many" do
@@ -240,6 +257,22 @@
       Parent.new.should_not @matcher.class_name('Node')
     end
 
+    it "should accept an association with a valid :autosave option" do
+      define_model :child, :parent_id => :integer
+      define_model :parent do
+        has_many :children, :autosave => true
+      end
+      Parent.new.should @matcher.autosave(:true)
+    end
+
+    it "should reject an association with a valid :autosave option" do
+      define_model :child, :parent_id => :integer
+      define_model :parent do
+        has_many :children, :autosave => false
+      end
+      Parent.new.should_not @matcher.autosave(:true)
+    end
+
     it "should accept an association with a nonstandard reverse foreign key, using :inverse_of" do
       define_model :child, :ancestor_id => :integer do
         belongs_to :ancestor, :inverse_of => :children, :class_name => :Parent
@@ -364,6 +397,22 @@
       Person.new.should_not @matcher.class_name('PersonDetail')
     end
 
+    it "should accept an association with a valid :autosave option" do
+      define_model :detail, :person_id => :integer, :disabled => :boolean
+      define_model :person do
+        has_one :detail, :autosave => true
+      end
+      Person.new.should @matcher.autosave(:true)
+    end
+
+    it "should reject an association with a valid :autosave option" do
+      define_model :detail, :person_id => :integer, :disabled => :boolean
+      define_model :person do
+        has_one :detail, :autosave => false
+      end
+      Person.new.should_not @matcher.autosave(:true)
+    end
+
   end
 
   context "have_and_belong_to_many" do
@@ -445,5 +494,24 @@
       Person.new.should_not @matcher.class_name('PersonRelatives')
     end
 
+    it "should accept an association with a valid :autosave option" do
+      define_model :relatives, :adopted => :boolean
+      define_model :person do
+        has_and_belongs_to_many :relatives, :autosave => true
+      end
+      define_model :people_relative, :person_id   => :integer,
+                                     :relative_id => :integer
+      Person.new.should @matcher.autosave(:true)
+    end
+
+    it "should reject an association with a bad :autosave option" do
+      define_model :relatives, :adopted => :boolean
+      define_model :person do
+        has_and_belongs_to_many :relatives
+      end
+      define_model :people_relative, :person_id   => :integer,
+                                     :relative_id => :integer
+      Person.new.should_not @matcher.autosave(:true)
+    end
   end
 end