Made nested contexts w/o a subject block be able to refer to its pare…

…nt subject block

Signed-off-by: Joshua Clayton <[email protected]>

lib/shoulda/context.rb

@@ -258,9 +258,9 @@ def get_instance_of(object_or_klass) # :nodoc:
     def instance_variable_name_for(klass) # :nodoc:
       klass.to_s.split('::').last.underscore
     end
-    
+
     private
-    
+
     def construct_subject
       if subject_block
         instance_eval(&subject_block)
@@ -327,6 +327,11 @@ def subject(&block)
       self.subject_block = block
     end
 
+    def subject_block
+      return @subject_block if @subject_block
+      parent.subject_block
+    end
+
     def full_name
       parent_name = parent.full_name if am_subcontext?
       return [parent_name, name].join(" ").strip

test/other/context_test.rb

@@ -169,6 +169,12 @@ class ::SomeModel; end
       should "return the result of the block as the subject" do
         assert_equal @expected, subject
       end
+
+      context "nested context block without a subject block" do
+        should "return the result of the parent context's subject block" do
+          assert_equal @expected, subject
+        end
+      end
     end
   end
 end