Write each test as its own unit. Write the tests in a way that will not be reliant on other tests to complete: Let us say there is a content management system with which you can create some custom content which then appears on your website as a module after publishing, and it may take some time to sync between the CMS and the application. A wrong way of testing your module is that the content is created and published in one test, and then checking the module in another test.
