`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)
```