Implement Manager#grab_key

lib/uh/wm/manager.rb

@@ -10,6 +10,10 @@ module Uh
       def connect
         @display.open
       end
+
+      def grab_key keysym
+        @display.grab_key keysym.to_s, KEY_MODIFIERS[:mod1]
+      end
     end
   end
 end

spec/uh/wm/manager_spec.rb

@@ -15,6 +15,14 @@ module Uh
           manager.connect
         end
       end
+
+      describe '#grab_key' do
+        it 'grabs given key on the display' do
+          expect(manager.display)
+            .to receive(:grab_key).with('q', KEY_MODIFIERS[:mod1])
+          manager.grab_key :q
+        end
+      end
     end
   end
 end