Implement `quit' action keyword

spec/uh/wm/actions_handler_spec.rb

@@ -0,0 +1,23 @@
+module Uh
+  module WM
+    RSpec.describe ActionsHandler do
+      let(:env)         { Env.new(StringIO.new) }
+      let(:events)      { Dispatcher.new }
+      subject(:actions) { described_class.new env, events }
+
+      describe '#evaluate' do
+        it 'evaluates given code' do
+          expect { actions.evaluate proc { throw :action_code } }
+            .to throw_symbol :action_code
+        end
+      end
+
+      describe '#quit' do
+        it 'emits the quit event' do
+          expect(events).to receive(:emit).with :quit
+          actions.quit
+        end
+      end
+    end
+  end
+end