Accept -l LAYOUT CLI option to set the layout

spec/uh/wm/cli_spec.rb

@@ -130,6 +130,15 @@ module Uh
           end
         end
 
+        context 'with layout option' do
+          let(:arguments) { %w[-l Object] }
+
+          it 'assigns the layout class in the env' do
+            cli.parse_arguments!
+            expect(cli.env.layout_class).to eq Object
+          end
+        end
+
         context 'with invalid option' do
           let(:arguments) { %w[--unknown-option] }
 

spec/uh/wm/env_spec.rb

@@ -13,6 +13,10 @@ module Uh
         expect(env).not_to be_debug
       end
 
+      it 'has no layout_class set' do
+        expect(env.layout_class).not_to be
+      end
+
       describe '#verbose?' do
         context 'when verbose mode is disabled' do
           before { env.verbose = false }