Add basic Remote#execute implementation

lib/producer/core/remote.rb

@@ -13,6 +13,15 @@ module Producer
       def session
         @session ||= Net::SSH.start(@hostname, Etc.getlogin)
       end
+
+      def execute(command)
+        output = ''
+        session.exec command do |ch, stream, data|
+          output << data
+        end
+        session.loop
+        output
+      end
     end
   end
 end

spec/producer/core/remote_spec.rb

@@ -2,6 +2,9 @@ require 'spec_helper'
 
 module Producer::Core
   describe Remote do
+    require 'net/ssh/test'
+    include Net::SSH::Test
+
     let(:hostname)    { 'some_host.example' }
     subject(:remote)  { Remote.new(hostname) }
 
@@ -28,5 +31,45 @@ module Producer::Core
         expect(remote.session).to be remote.session
       end
     end
+
+    describe '#execute' do
+      let(:args)    { 'some remote command'}
+      let(:command) { "echo #{args}" }
+
+      # FIXME: refactor this with helpers, expectations and/or matchers.
+      def with_new_channel_story
+        story do |session|
+          ch = session.opens_channel
+          yield ch
+          ch.gets_close
+          ch.sends_close
+        end
+      end
+
+      def story_completed?
+        socket.script.events.empty?
+      end
+
+      before do
+        allow(remote).to receive(:session) { connection }
+      end
+
+      it 'executes the given command in a new channel' do
+        with_new_channel_story do |ch|
+          ch.sends_exec command
+          ch.gets_data args
+        end
+        remote.execute command
+        expect(story_completed?).to be
+      end
+
+      it 'returns the output' do
+        with_new_channel_story do |ch|
+          ch.sends_exec command
+          ch.gets_data args
+        end
+        expect(remote.execute(command)).to eq args
+      end
+    end
   end
 end