Introduce Env to manage CLI env and config

spec/uh/wm/env_spec.rb

@@ -0,0 +1,30 @@
+module Uh
+  module WM
+    RSpec.describe Env do
+      let(:output)  { StringIO.new }
+      let(:logger)  { Logger.new(StringIO.new) }
+
+      subject(:env) { described_class.new output, logger_: logger }
+
+      describe '#logger' do
+        it 'returns a logger' do
+          expect(env.logger).to be_a ::Logger
+        end
+      end
+
+      describe '#log' do
+        it 'logs given message at info level' do
+          expect(logger).to receive(:info).with 'some message'
+          env.log 'some message'
+        end
+      end
+
+      describe '#print' do
+        it 'prints the message to the output' do
+          env.print 'some message'
+          expect(output.string).to eq 'some message'
+        end
+      end
+    end
+  end
+end