SSH task tests (#684)

* Update description and ensure :deploy_to exists

* Add specs for ssh task

spec/support/outputs/ssh.txt

@@ -0,0 +1 @@
+ssh localhost -p 22 -tt 'cd .*/deploy && exec \$SHELL'

spec/tasks/default_spec.rb

@@ -20,10 +20,19 @@
   end
 
   describe 'ssh' do
-    it 'runs ssh' do
-      expect_any_instance_of(Kernel).to receive(:exec)
+    it 'runs ssh when :deploy_to exists' do
+      expect_any_instance_of(Kernel).to receive(:exec).with(output_file('ssh'))
       subject.invoke
     end
+
+    it "exits with an error if :deploy_to doesn't exist" do
+      deploy_to = Mina::Configuration.instance.remove(:deploy_to)
+
+      expect { subject.invoke }.to raise_error(SystemExit)
+                               .and output(/deploy_to must be defined!/).to_stdout
+
+      Mina::Configuration.instance.set(:deploy_to, deploy_to)
+    end
   end
 
   describe 'debug_configuration_variables' do

tasks/mina/default.rb

@@ -83,7 +83,8 @@
   end
 end
 
-desc 'Open an ssh session to the server and cd to deploy_to folder'
+desc 'Opens an SSH session and positions to :deploy_to folder'
 task :ssh do
+  ensure!(:deploy_to)
   exec %{#{Mina::Backend::Remote.new(nil).ssh} 'cd #{fetch(:deploy_to)} && exec $SHELL'}
 end