I like this one, cool format.

Thanks; I learned a new format specifier.

null is not null in powershell, instaed write $null

It looks like overhead..

I found the problem in Test-Solution!

If fisrt char is '-' or '_', the result was broken:

'-a' => '-' // must be 'A'
'_some_text' => '_omeText' // must be 'SomeText'

It is very unpleasant that I had to open solutions and lose the opportunity to get points!!!

PowerShell version of tests is broken! It prints on several cases:

Expected: value to be empty but it was { }

There are more same instructions, are not?