title: Errno::EACCES: Permission denied @ unlink_internal when running rake test:models
body: <p>I'm playing with rails 4. I just created very simple test for my model but when I try to execute "rake test:models" I get following error:</p>
  
  <pre><code>C:\rails\project&gt;rake test:models
  DL is deprecated, please use Fiddle
  rake aborted!
  Errno::EACCES: Permission denied @ unlink_internal - /tmp/db/new.sqlite3
  C:/rails/project/test/test_helper.rb:3:in `&lt;top (required)&gt;'
  C:/rails/project/test/models/admin_test.rb:1:in `&lt;top (required)&gt;'
  Tasks: TOP =&gt; test:models
  (See full trace by running task with --trace)
  </code></pre>
  
  <p>My test database configuration looks as follows:</p>
  
  <pre><code>test:
    adapter: sqlite3
    database: /tmp/db/new.sqlite3
    pool: 5
    timeout: 5000
  </code></pre>
  
  <p>"/tmp/db" is directory where I have full access on my personal laptop.</p>
  
  <p>Any ideas what could be source of this problem?</p>