Rake Test fail

Failures:

  1) Metaforce::Job::Retrieve.zip_file should eq "~\x8A\e"
     Failure/Error: it { should eq "~\x8A\e" }

```
   expected: "~\x8A\e"
        got: "~\x8A\e"

   (compared using ==)
 # ./spec/lib/job/retrieve_spec.rb:25:in `block (3 levels) in <top (required)>'
```

Any idea why this might be happening?
