Extract logger to its own class

lib/hi.rb

@@ -1,4 +1,5 @@
 require 'hi/version'
+require 'hi/logger'
 require 'hi/request'
 require 'hi/app'
 require 'hi/server'

lib/hi/logger.rb

@@ -0,0 +1,15 @@
+require 'awesome_print'
+
+module Hi
+  class Logger
+    def log(message)
+      ap message unless testing
+    end
+
+    private
+
+    def testing
+      ENV['RACK_ENV'] == 'test'
+    end
+  end
+end

spec/hi/logger_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+require 'hi/logger'
+
+describe Hi::Logger do
+  let(:logger)  { described_class.new }
+  let(:message) { 'Hello logger' }
+
+  context "when RACK_ENV is not 'test'" do
+    before do
+      ENV['RACK_ENV'] = 'the real deal'
+    end
+
+    it 'prints message to standard out' do
+      stdout = capture_stdout do
+        logger.log message
+      end
+
+      expect(stdout).to include message
+    end
+  end
+
+  context "when RACK_ENV is 'test'" do
+    before do
+      ENV['RACK_ENV'] = 'test'
+    end
+
+    it 'does not print message to standard out' do
+      stdout = capture_stdout do
+        logger.log message
+      end
+
+      expect(stdout).to be_empty
+    end
+  end
+
+  private
+
+  def capture_stdout
+    captured = StringIO.new
+    stdout = $stdout
+    $stdout = captured
+
+    yield
+
+    $stdout = stdout
+    captured.string
+  end
+end