`test()` in `within(dir)` should run after cd into dir

Given a `test()` in a `within()`,

```
within('/home/vagrant/app1/current') do
if test '[ -e tmp/pids/server.pid ]'
execute :kill, '-INT', 'tmp/pids/server.pid'
end
end
```

Does it make sense to generate the following commands?

```
cd /home/vagrant/app1/current && [ -e tmp/pids/server.pid ]
cd /home/vagrant/app1/current && (/usr/bin/env kill -INT tmp/pids/server.pid)
```

However, currently it doesn't cd into the given directory when generate test() command:

```
[ -e tmp/pids/server.pid ]
cd /home/vagrant/app1/current && (/usr/bin/env kill -INT tmp/pids/server.pid)
```

Start by tracing the within and test entry points that generate the shown shell commands, then reproduce the example from the issue. Done means the test command runs after changing into the within directory and the generated commands consistently use that directory, matching the expected output.

Scritto dal modello di indicizzazione a partire dal testo della issue.