Delegates `layout_*' messages as Layout#handle_*

features/actions/layout_delegation.feature

@@ -0,0 +1,31 @@
+Feature: `layout_*' action keywords
+
+  Background:
+    Given a file named layout.rb with:
+      """
+      class Layout
+        def register _; end
+
+        def handle_some_action arg
+          puts arg
+        end
+      end
+      """
+
+  Scenario: delegates messages matching `layout_*' to `layout_handle_*'
+    Given a run control file with:
+      """
+      key(:f) { layout_some_action :testing_some_action }
+      """
+    And uhwm is running
+    When I press the alt+f keys
+    Then the output must contain ":testing_some_action"
+
+  Scenario: logs an error about unimplemented messages
+    Given a run control file with:
+      """
+      key(:f) { layout_unknown_action }
+      """
+    And uhwm is running
+    When I press the alt+f keys
+    Then the output must match /layout.+no.+implem.+handle_unknown_action/i