title: Cypress - automatically run all tests in browser, with hot reload
body: <p>By default, running <code>cypress open</code> opens the Cypress window and <em>then I have to manually hit the "Run All Tests" button</em> to run them all.</p>
  
  <p>How can run all tests in the browser just by running the <code>cypress open</code>, with no additional step?</p>
  
  <p>Thank you.</p>
  
  <p>Edit: I need the tests to rerun when I change the test files, just like <code>cypress open</code> does, so just running them once (like in headless mode) doesn't help.</p>