## Alcotest backend for QCheck

We use environment variables for controlling QCheck here, since alcotest doesn't seem to provide a lot of flexibility.

- `QCHECK_VERBOSE` if "1" or "true", will make tests verbose
- `QCHECK_SEED` if an integer, will fix the seed
- `QCHECK_LONG` is present, will trigger long tests

- since 0.9

`val to_alcotest : ?colors:bool -> ?verbose:bool -> ?long:bool -> ?debug_shrink:Stdlib.out_channel option -> ?debug_shrink_list:string list -> ?speed_level:Alcotest.speed_level -> ?rand:Stdlib.Random.State.t -> QCheck2.Test.t -> unit Alcotest.test_case`

Convert a qcheck test into an alcotest test.

The optional `speed_level` is ``Slow` by default, meaning Alcotest can skip such a test when the `-q` flag is passed. Passing ``Quick` instead means the test is always run.

In addition to `speed_level` and the environment variables mentioned above, you can control the behavior of QCheck tests using optional parameters that behave in the same way as the parameters of `QCheck_base_runner.run_tests`.

- since 0.9

- since 0.9 parameters [verbose], [long], [rand]

- since 0.19 parameters [colors], [debug_shrink], [debug_shrink_list]

- since 0.24 parameter [speed_level]