Tag: F#

XUnit and Connection Strings

A real quick one but maybe a good one.

I was running the xUnit.gui.exe program to run units tests using xUnit… duh. Problem I ran into is that xUnit is not a part of the solution that the tests were. This caused issues when trying to run integration tests since the needed app.config wouldn’t be read by xUnit as the config file used when running an app is the config file from the topmost (Usually UI) project/application. So I made a wild guess that if I follow that logic, what little there may be, and add the connection strings to the xunit.gui.exe.config file as if it were an app.config/web.config, it should use the connection strings added… and turns out it did.

And there you have it… it being the solution and not a clown.

Fun with F# and Method Reduction

So the first and second methods came from this book , but I thought for fun I might reduce it further to see
how small a call could get.

Basically take a number and divide it by another number 3 times.

let bytesToGb item =
let itemB = item / 1024I
let itemC = itemB / 1024I
let itemD = itemC / 1024I

Is the same as:
let bytesToGb item =
let x = x / 1024I
let x = x / 1024I
let x = x / 1024I

And more reduction:
let bytesToGb item =
item
|> (fun x -> x/1024L)
|> (fun x -> x/1024L)
|> (fun x -> x/1024L)

Or more:
let divide x = x/1024L
let bytesToGb = divide >> divide >> divide

If you’re familiar with Func/Action, Linq, ect this might actually look a lot like some of the newer “functional like” additions to C#. Well at least the third one. Funny part, and I didn’t know this, is that most of the more interesting additions to C# (Generics, Linq, Lambda expressions) actually came from F#; Which was built to match other existing functional languages like Haskel)  Go figure.

XUnit.gui.exe – this assembly is built by a runtime newer than the currently…

So ran into this while using XUnit (For my new F# adventure) and I ran into this error when I tried to use the XUnit.gui.exe thing:

“This assembly is built by a runtime newer that the currently loaded runtime and cannot be loaded.”

Pretty straightforward in that I am creating projects in 4.0 and one can infer XUnit wasn’t ready for this. At first I was thinking, painful as that is, that XUnit can’t handle 4.0. To my relief, I found this post at:

www.markhneedham.com

Great… except it only talks about the xunit.console.exe.config and there wasn’t a xunit.gui.exe.config. Well in a moment of questionable brilliance, more like a slight moment of clarity, I decided to copy the xunit.console.exe.config and rename the copied file to “xunit.gui.exe.config” and it worked. Go figure.

This is a picture for the slighty less lazy:

And for those more lazy than that:

Here’s the xml in case you’re more lazy than I am.