Implement CLI debug option

features/cli_debug.feature

@@ -0,0 +1,11 @@
+Feature: CLI debug option
+
+  Background:
+    Given a recipe with:
+      """
+      task(:trigger_error) { fail 'some error' }
+      """
+
+  Scenario: reports recipe errors
+    When I execute the recipe with option -d
+    Then the output must match /\ARuntimeError:.*\n\ncause:\nRuntimeError:/

features/cli_usage.feature

@@ -10,6 +10,7 @@ Feature: CLI usage
 
       options:
           -v, --verbose                    enable verbose mode
+          -d, --debug                      enable debug mode
           -n, --dry-run                    enable dry run mode
           -t, --target HOST                target host
       """

features/steps/recipe_steps.rb

@@ -24,6 +24,10 @@ When /^I successfully execute the recipe on remote target$/ do
   assert_exit_status 0
 end
 
+When /^I execute the recipe with option (-.+)$/ do |option|
+  run_simple "producer #{option} recipe.rb", false
+end
+
 When /^I successfully execute the recipe with option (-.+)$/ do |option|
   run_simple "producer #{option} recipe.rb", false
   assert_exit_status 0