In SetUp method just invoke AtataContext.Configure() method that returns AtataContextBuilder instance, then invoke configuration methods and finally invoke Build() method:

[SetUp]
public void SetUp()
{
    AtataContext.Configure().
        // TODO: Invoke configuration methods.
        Build();
}

To clean up the AtataContext do the following in the TearDown method:

[TearDown]
public void TearDown()
{
    AtataContext.Current.CleanUp();
}

It also closes web driver instance as well as a browser.