Implement `composed_macro' recipe keyword

features/recipe_compose_macro.feature

@@ -1,15 +1,29 @@
 Feature: `compose_macro' recipe keyword
 
-  Scenario: allows macro composition
-    Given a recipe with:
+  Background:
+    Given a recipe named "composed_macro.rb" with:
       """
       macro :hello do |prefix, *args|
         echo 'hello %s %s' % [prefix, args.join(', ')]
       end
 
       compose_macro :hello_composed, :hello, 'composed'
+      """
 
+  Scenario: declares a composed macro as recipe keyword
+    Given a recipe with:
+      """
+      source 'composed_macro'
       hello_composed :foo, :bar
       """
     When I successfully execute the recipe
     Then the output must contain "hello composed foo, bar"
+
+  Scenario: declares a composed macro as task keyword
+    Given a recipe with:
+      """
+      source 'composed_macro'
+      task(:some_task) { hello_composed :foo, :bar }
+      """
+    When I successfully execute the recipe
+    Then the output must contain "hello composed foo, bar"

features/steps/recipe_steps.rb

@@ -2,6 +2,10 @@ Given /^a recipe with:$/ do |recipe_body|
   write_file 'recipe.rb', recipe_body
 end
 
+Given /^a recipe named "([^"]+)" with:$/ do |recipe_path, recipe_body|
+  write_file recipe_path, recipe_body
+end
+
 When /^I execute the recipe$/ do
   run_simple 'producer recipe.rb', false
 end