Extract logic for current target ssh user name:

Add Remote#user_name method, with code returning which user name
will be used for SSH authentication.

lib/producer/core/remote.rb

@@ -11,7 +11,11 @@ module Producer
       end
 
       def session
-        @session ||= Net::SSH.start(@hostname, Etc.getlogin)
+        @session ||= Net::SSH.start(@hostname, user_name)
+      end
+
+      def user_name
+        Etc.getlogin
       end
 
       def fs

spec/producer/core/remote_spec.rb

@@ -12,8 +12,8 @@ module Producer::Core
     end
 
     describe '#session' do
-      it 'builds a new SSH session to the remote host' do
-        expect(Net::SSH).to receive(:start).with(hostname, Etc.getlogin)
+      it 'builds a new SSH session to the remote host with #user_name' do
+        expect(Net::SSH).to receive(:start).with(hostname, remote.user_name)
         remote.session
       end
 
@@ -29,6 +29,12 @@ module Producer::Core
       end
     end
 
+    describe '#user_name' do
+      it 'returns the name of the user currently logged in' do
+        expect(remote.user_name).to eq Etc.getlogin
+      end
+    end
+
     describe '#fs' do
       it 'builds a new FS' do
         expect(Remote::FS).to receive(:new)