The error produced by nested It blocks is obfuscated by an error in ConvertTo-FailureLines

[alx9r]

Repro

Describe describe {
    It outer {
        It inner { $true }
    }
}

Results in this error:

Analysis

The originating block of code uses variable $count. That line was originally written as part of #426 in 77b84c9 like this:

Select-Object -First $count

I expected this to work because -First is typed as [int] and [int]$null evaluates to 0 in powershell. But these tests demonstrate that implicit casting of parameters does not behave in that manner nor consistently.

That line happens to have been changed in 344aee6 to this:

& $SafeCommands['Select-Object'] -First $count

That change is inconsequential to this problem, though, and this problem existed prior to that change in the original 77b84c9.

Fix

I have a working fix which is simply a matter of initializing $count. This restores the helpful output error message as follows:

I'll create a PR as soon as I (re)figure out the right way to do that.

[alx9r]

This is already fixed as of 900d028.