Flatten features directory tree

features/test_dir.feature

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+@sshd
+Feature: `dir?' condition keyword
+
+  Background:
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :testing_directory_existence do
+        condition { 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"