Implement recipe evaluation feature

features/recipe.feature

@@ -0,0 +1,10 @@
+Feature: recipe evaluation
+
+  Scenario: evaluates ruby code in a recipe
+    Given a recipe with:
+      """
+      puts 'hello from recipe'
+      """
+    When I execute the recipe
+    Then the exit status must be 0
+    And the output must contain "hello from recipe"