How to properly mock dependencies in ASP.NET Core Controller Action with F#?

I am reviewing an ASP.NET Core project created in F# (but not using Giraffe) and wondering how can tests can properly be achieved on controllers.

I purposefully (over) simplified the code of a controller in that source code:

[<Route("api/v1/A")>]
[<ApiController>]
type AController (myDbContext: MyDbContext) =
    inherit ControllerBase()

    [<HttpPost("post-a")>]
    member this.PostA() =
        myDbContext.SaveChanges()
        this.Ok()

Reading that answer How to mock out rich dependencies when testing F#, it seems that it would be beneficial to leverage the dependency as a simple function parameter which would lead me to think about this sort of solution:

[<Route("api/v1/A")>]
[<ApiController>]
type AController (myDbContext: MyDbContext) =
    inherit ControllerBase()

    [<HttpPost("post-b")>]
    member this.PostB() =
        this.PostB (fun () -> myDbContext.SaveChanges() |> ignore)

    [<NonAction>]
    member this.PostB (whateverDependencyAction: unit -> unit) =
        whateverDependencyAction()
        this.Ok()

However, not sure leaking details about testing is a good thing either.