Test generated boolean rule property

spec/ameba/base_spec.cr

@@ -32,6 +32,10 @@ module Ameba::Rule
         subject.description.should_not be_nil
       end
 
+      it "has a dummy? property" do
+        subject.dummy?.should be_true
+      end
+
       it "has excluded property" do
         subject.excluded.should be_nil
       end

spec/ameba/formatter/todo_formatter_spec.cr

@@ -102,6 +102,7 @@ module Ameba
               # Run `ameba --only Ameba/DummyRule` for details
               Ameba/DummyRule:
                 Description: Dummy rule that does nothing.
+                Dummy: true
                 Excluded:
                 - source1.cr
                 - source2.cr

spec/spec_helper.cr

@@ -7,6 +7,7 @@ module Ameba
   class DummyRule < Rule::Base
     properties do
       description : String = "Dummy rule that does nothing."
+      dummy true
     end
 
     def test(source)