Improve verbose mode output formatting

spec/producer/core/env_spec.rb

@@ -75,6 +75,10 @@ module Producer::Core
       it 'has a log level of ERROR' do
         expect(env.log_level).to eq Logger::ERROR
       end
+
+      it 'uses our formatter' do
+        expect(env.logger.formatter).to be_a LoggerFormatter
+      end
     end
 
     describe '#remote' do

spec/producer/core/logger_formatter_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+module Producer::Core
+  describe LoggerFormatter do
+    describe '#call' do
+      let(:severity)  { double 'severity' }
+      let(:datetime)  { double 'datetime' }
+      let(:progname)  { double 'progname' }
+      let(:message)   { 'some message' }
+
+      subject { described_class.new.call(severity, datetime, progname, message) }
+
+      it 'returns the given message with a line separator' do
+        expect(subject).to eq "#{message}\n"
+      end
+    end
+  end
+end