Must be a different notion of what a fixture is than I’m accustomed to.
Most of my tests are unit tests, property tests, or integration/functional tests. A lot of my tests will run DAL code or poke at the API and see what state the database is in. As a result, when I talk about fixtures I mean the data installed into the database post-table-truncation. Usually in Haskell I’ll also have a datatype storing all the data from the database in memory as a big Fixtures record, a pattern I picked up from a past employer.