The next type of tests that we can generate are called functional tests. Functional tests allow us to emulate our application without running it through a web server. This provides us with a way to quickly test the output of our application without introducing the overhead of a web server.
This emulation process is achieved by directly manipulating the
$_GET parameters before executing our application. As a side effect of this behavior, however, certain variables, such as
$_COOKIE, as well as headers, can result in
junk errors being thrown, which wouldn't necessarily be thrown in a real environment. Moreover, with Codeception, our functional tests will be executing within a single memory container, ...