Either [[modelClass]] or [[tableName]] must be set. You should also provide fixture data in the file
specified by [[dataFile]] or overriding ActiveFixture::getData if you want to use code to generate the fixture data.
When the fixture is being loaded, it will first call ActiveFixture::resetTable to remove any existing data in the table.
It will then populate the table with the data returned by ActiveFixture::getData.
After the fixture is loaded, you can access the loaded data via the [[data]] property. If you set [[modelClass]],
you will also be able to retrieve an instance of [[modelClass]] with the populated data via [[getModel()]].
For more details and usage information on ActiveFixture, see the guide article on fixtures.