ColumnFixture: Rows contains input and expected output. Tests are executed in order.
RowFixture: An exact set of order-independent results
ActionFixture: A script that imitates user actions
Comment: just a comment, not a test
RowEntryFixture: for entering data into a database
TableFixture: custom test
CommandLineFixture: execute shell script
SummaryFixture: List all the tests on a page