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@@ -377,6 +377,13 @@ module ThoughtBot # :nodoc:
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             end
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           end
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         end
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+        
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+        # Macro that creates a test asserting that the rendered view contains a <form> element.
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+        def should_render_a_form
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+          should "display a form" do
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+            assert_select "form", true, "The template doesn't contain a <form> element"            
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+          end
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+        end
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       end
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       module InstanceMethods # :nodoc:

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@@ -47,14 +47,10 @@ module ThoughtBot # :nodoc:
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                 should_respond_with :success
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                 should_render_template :edit
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                 should_not_set_the_flash
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-
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+                should_render_a_form
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                 should "set @#{res.object} to requested instance" do
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                   assert_equal @record, assigns(res.object)
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                 end
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-          
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-                should "display a form" do
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-                  assert_select "form", true, "The template doesn't contain a <form> element"            
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-                end
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               end
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             end
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           end
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@@ -95,10 +91,7 @@ module ThoughtBot # :nodoc:
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                 should_assign_to res.object
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                 should_not_set_the_flash
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                 should_render_template :new
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-          
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-                should "display a form" do
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-                  assert_select "form", true, "The template doesn't contain a <form> element"            
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-                end
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+                should_render_a_form
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               end
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             end
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           end

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@@ -95,6 +95,25 @@ module ThoughtBot # :nodoc:
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       def assert_valid(obj)
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         assert obj.valid?, "Errors: #{obj.errors.full_messages.join('; ')}"
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       end
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+      
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+      # Asserts that the block uses ActionMailer to send emails
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+      #
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+      #  assert_sends_email(2) { Mailer.deliver_messages }
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+      def assert_sends_email(num = 1, &blk)
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+        ActionMailer::Base.deliveries.clear
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+        blk.call
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+        msg = "Sent #{ActionMailer::Base.deliveries.size} emails, when #{num} expected:\n"
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+        ActionMailer::Base.deliveries.each { |m| msg << "  '#{m.subject}' sent to #{m.to.to_sentence}\n" }
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+        assert(num == ActionMailer::Base.deliveries.size, msg)
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+      end
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+
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+      # Asserts that the block does not send emails thorough ActionMailer
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+      #
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+      #  assert_does_not_send_email { # do nothing }
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+      def assert_does_not_send_email(&blk)
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+        assert_sends_email 0, &blk
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+      end
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+      
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     end
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   end
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 end