Implement `has_dir' condition keyword

features/steps/remote_steps.rb

@@ -1,3 +1,7 @@
+Given /^a remote directory named "([^"]+)"$/ do |path|
+  create_dir path
+end
+
 Given /^a remote file named "([^"]+)"$/ do |file_name|
   write_file file_name, ''
 end

features/tests/has_dir.feature

@@ -0,0 +1,23 @@
+@sshd
+Feature: `has_dir' condition keyword
+
+  Background:
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :testing_directory_existence do
+        condition { has_dir 'some_directory' }
+
+        echo 'evaluated'
+      end
+      """
+
+  Scenario: succeeds when directory exists
+    Given a remote directory named "some_directory"
+    When I successfully execute the recipe
+    Then the output must contain "evaluated"
+
+  Scenario: fails when directory does not exist
+    When I successfully execute the recipe
+    Then the output must not contain "evaluated"