Create an F# project in VSCode

Step-by-step instructions

Create new directory

Move to new directory

At the console type Code . or open VSCode and then open the new directory you just created

Press [Shift] [Command/Ctrl] [P] and type F#

Select New Project

Choose classlib or console or other project type for the production project

Choose the project directory (if left empty, current directory will be used)

Provide a project name (using production.fsproj for this example)

Press [Shift] [Command/Ctrl] [P] and type FAKE

Choose Default build, you should see an output similar to this:

Checking Paket version (downloading latest stable)...
Paket.exe 3.33.5 is up to date.
Paket version 3.33.5
0 seconds - ready.
Building project with version: LocalBuild
Shortened DependencyGraph for Target Build:
<== Build
 <== Clean
...

Press [Shift] [Command/Ctrl] [P] and type F#

Select New Project

Choose fsunit for test code

Choose the project directory (if left empty current directory will be used)

Provide a project name (using test.fsproj for this example)

Open up the test.fsproj file

Press [Shift] [Command/Ctrl] [P] and type F#

Select Add Project Reference

Choose test.fsproj project as the project that you want to edit

Choose production.fsproj project as the reference you want to add

Verify that test.fsproj has been changed and contains a reference to production.fsproj

...
<ItemGroup>
  <ProjectReference Include="../production/production.fsproj">
    <Name>production.fsproj</Name>
    <Project>{df896c20-dc7e-4d4d-90da-546d6154d641}</Project>
  </ProjectReference>
</ItemGroup>
...

Press [Shift] [Command/Ctrl] [P] and type paket

Select Add Nuget Package

Type Nunit.Console

Verify that paket.dependencies gets updated with new dependency

source https://www.nuget.org/api/v2
nuget FAKE
nuget FSharp.Core
nuget FsUnit
nuget FsCheck
nuget nunit.console // <- !!!This line should be present!!!

Open build.fsx

Add open Fake.Testing after open Fake

open Fake
open Fake.Testing // <--!!!Add this line!!!

Add the test task

let testAssemblies = !! (buildDir + "*Tests.dll") // <--!!!Add this line!!!
Target "UnitTests" (fun _ -> testAssemblies |> NUnit3 id) // <--!!!Add this line!!!

Add UnitTests to the build

"Clean"
==> "Build"
==> "UnitTests" // <--!!!Add this line!!!
==> "Deploy"
RunTargetOrDefault "Build"

Press [Shift] [Command/Ctrl] [P] and type FAKE

Choose build

Choose UnitTests, you should see an output similar to this:

Checking Paket version (downloading latest stable)...
Paket.exe 3.33.5 is up to date.
Paket version 3.33.5
0 seconds - ready.
Building project with version: LocalBuild
Shortened DependencyGraph for Target UnitTests:
<== UnitTests
 <== Build
    <== Clean
...

Voila!

Bonus

Press [Shift] [Command/Ctrl] [B]

Should show an error and you can choose to edit. Edit the configuration to run the build script

{
  // See https://go.microsoft.com/fwlink/?LinkId=733558
  // for the documentation about the tasks.json format
  "version": "0.1.0",
  "command": "./build.sh", // <--!!!Modify this line to call your build script (build.sh on mac/linux) or (build.cmd on windows)!!!
  "isShellCommand": true,
  "args": [], // <--!!!Modify this line to remove arguments!!!
  "showOutput": "always"
}

Press [Shift] [Command/Ctrl] [B], you should see an output similar to this:

Checking Paket version (downloading latest stable)...
Paket.exe 3.33.5 is up to date.
Paket version 3.33.5
0 seconds - ready.
Building project with version: LocalBuild
Shortened DependencyGraph for Target Build:
<== Build
 <== Clean
...