[Audio] Provengo provides various ways to define how and when events can and should be triggered. One of these ways is the storyline DSL shown here. This defines a sequence of events for testing the store. The code begins by opening a session in a given URL. It, then, continues with a series of invocations of events. Each invocation is specified by calling the event function with the events parameters. The parameters are given as a dictionary. For example, the username and password parameters that we specified in the Login event above are specified by key-value pairs in this dictionary. Note that, in addition to activating the system being tested, this test also confirm that the system acts as predicted. For instance, the ' checkOut' step makes sure the cart only has the products we expect it to contain and nothing else..