Playing around with contexts and examples

src/spectator.cr

@@ -15,6 +15,10 @@ module Spectator
     {% debug %}
   end
 
+  macro _spec_add_example(example)
+    {{example.id}}.run
+  end
+
   at_exit do
     # TODO
   end

src/spectator/dsl.cr

@@ -11,6 +11,10 @@ module Spectator
       {% module_name = (type.id + safe_name.camelcase).id %}
       module {{module_name.id}}
         include ::Spectator::DSL
+
+        module Context
+        end
+
         {{block.body}}
       end
     end
@@ -27,32 +31,39 @@ module Spectator
       {% safe_name = description.id.stringify.gsub(/\W+/, "_") %}
       {% class_name = (safe_name.camelcase + "Example").id %}
       class {{class_name.id}} < ::Spectator::Example
+        include Context
+
         def run
           {{block.body}}
         end
       end
+      ::Spectator._spec_add_example({{class_name.id}}.new)
     end
 
     def it_behaves_like
       raise NotImplementedError.new("Spectator::DSL#it_behaves_like")
     end
 
-    def subject
-      raise NotImplementedError.new("Spectator::DSL#subject")
+    macro subject(&block)
+      let(:subject) {{block}}
     end
 
-    def subject!
-      raise NotImplementedError.new("Spectator::DSL#subject!")
-    end
-
-    def let
-      raise NotImplementedError.new("Spectator::DSL#let")
+    macro let(name, &block)
+      module Context
+        def {{name.id}}
+          {{block.body}}
+        end
+      end
     end
 
     def let!
       raise NotImplementedError.new("Spectator::DSL#let!")
     end
 
+    macro is_expected
+      expect(subject)
+    end
+
     def before_all
       raise NotImplementedError.new("Spectator::DSL#before_all")
     end

src/spectator/example.cr

@@ -1,12 +1,5 @@
 module Spectator
-  class Example
-    def initialize(@description : String, @block : ->)
-    end
-
-    def run
-      @block.call
-    rescue ex : ExpectationFailedError
-      puts ex
-    end
+  abstract class Example
+    abstract def run
   end
 end