Assert Some with FsUnit

Question

I am trying to check that my function returns `Some(x)` ``` testedFunc() |> should be (sameAs Some) testedFunc() |> should be Some testedFunc() |> should equal Some ``` All don't work. I'd rather not use: ``` match testedFunc() with | Some -> Pass() | None -> Fail() ``` Anyone know of a way to do this?

Accepted Answer

I haven't really used FsUnit, but something like this should work...

```
testedFunc() |> Option.isSome |> should equal true
```

Or because an Option already has an IsSome property, you could do this, but be careful of case - it's different from the `Option.isSome` function.

```
testedFunc().IsSome |> should equal true
```

A third approach would be to compose together the function you're testing with `Option.isSome` to get a function that returns boolean directly. This isn't so useful in this example, but if you need to test an Option-returning function several times with a variety of inputs, this approach could help reduce duplicate code.

```
let testedFunc = testedFunc >> Option.isSome
testedFunc() |> should equal true
```

Assert Some with FsUnit

Solution

Problem