title: How to start TDD/BDD PHP CodeIgniter
body: <p>I have been reading about TDD/BDD for quite a while now but I could never figure out how to implement it in a project.</p>
  
  <p>This is a simplified version of the project I am currently working :<br/>
  <em>A website that lets people signup, post used books for sale. People that needs these books can search for books posted for sale close-by and send an email message to the seller via the website.</em></p>
  
  <p>This is being written in CodeIgniter with me as the only developer working on it. For this scenario, can you please tell me how exactly would I go about testing - where to begin with and what would be tested.</p>
  
  <p>I've been wanting to do this for quite a while, I kind of understand the concept, but the actual implementation eludes me, many thanks!</p>