Unit Tests in F#


In the F# community, I have seen a lot of talk about how cool functional programming is, how to use continuations, monads, and so on. I haven’t seen much about using F# for unit testing how to unit test F# code. I’ve been particularly interested in unit testing since I’ve started a larger web project and once I had my MVC controller ready, I wanted to run the unit tests. Since I’m pushing myself to use F# more, I’m writing the unit tests in F#.

I just want to let you know that writing a unit test in F# is as easy as anywhere else. After including a reference to MbUnit in my test assembly, I wrote a simple test like so:

namespace somenamespace.TestSuite
open MbUnit.Framework

[<TestFixture>]
type SampleTest() =
  [<FixtureSetUp>]
  member this.Setup() =
    // Do setup work
    ()

  [<FixtureTearDown>]
  member this.Teardown() =
    // Do tear down work
    ()

  [<Test>]
  member this.IAmATest() =
    Assert.AreEqual(1, 1, "This was supposed to work")
    ()

For you C#/C++ folks, the empty parens () at the end of the functions just state that the member has a void return type. For the VB.NET folks, it is the same as a Sub.

And yes, all the other attributes you expect from MbUnit do work just fine in F#. When you add F# to your toolbox, you can leverage the time you spent learning unit testing frameworks. Hopefully, this makes the transition a little more appealing.

  1. Leave a comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: