title: Ruby: How to run all unit tests that I have in a folder with a single command?
body: <p>I have, let's say:</p>
  
  <pre><code>emp_test.rb
  sales_emp_test.rb
  corporate_emp_test.rb
  payroll_emp_test.rb
  </code></pre>
  
  <p>How can I run them all together? Should I include them into another test file?</p>
  
  <p>I am using test/unit gem.</p>