more tests and fix missing label abstract method in PushButton

library/cwm/src/lib/cwm/widget.rb

@@ -603,6 +603,8 @@ def value=(val)
   #   end
   class PushButton < AbstractWidget
     self.widget_type = :push_button
+
+    abstract_method :label
   end
 
   # Widget representing menu button with its submenu

library/cwm/test/widgets_test.rb

@@ -147,6 +147,56 @@ def initialize
         expect(TNotHandleEvents.new.cwm_definition).to_not be_key("handle_events")
       end
     end
+
+    class TInit < CWM::AbstractWidget
+      self.widget_type = :empty
+      def init
+      end
+    end
+
+    it "returns hash with key init when init method defined" do
+      expect(TInit.new.cwm_definition).to be_key("init")
+    end
+
+    class THandle1 < CWM::AbstractWidget
+      self.widget_type = :empty
+      def handle
+      end
+    end
+
+    it "returns hash with key handle when handle without parameter defined" do
+      expect(THandle1.new.cwm_definition).to be_key("handle")
+    end
+
+    class THandle2 < CWM::AbstractWidget
+      self.widget_type = :empty
+      def handle(event)
+      end
+    end
+
+    it "returns hash with key handle when handle with parameter defined" do
+      expect(THandle2.new.cwm_definition).to be_key("handle")
+    end
+
+    class TStore < CWM::AbstractWidget
+      self.widget_type = :empty
+      def store
+      end
+    end
+
+    it "returns hash with key store when store method defined" do
+      expect(TStore.new.cwm_definition).to be_key("store")
+    end
+
+    class TCleanup < CWM::AbstractWidget
+      self.widget_type = :empty
+      def cleanup
+      end
+    end
+
+    it "returns hash with key cleanup when cleanup method defined" do
+      expect(TCleanup.new.cwm_definition).to be_key("cleanup")
+    end
   end
 end