It skips it-statement when executing function in Pester, but shouldn't

I am trying to test a Function in an script file that is testing the connection to a PC. I am trying to do that by calling the mock "Test-Connection" from an other Script in an Pester Test.

When I run Temp.Testing.ps1

describe 'Test Error Handling' {
    $myDir = Split-Path -parent $PSCommandPath  
    $testFile = "$myDir\TryToRenameComputer.ps1"
    .$testFile

    mock 'Test-Connection' { $false }

    $pathForLogs = "C:\temp\Logs.txt"

    it 'exits if Test-Connection Failed'{
        TryToRenameComputer -OldName "OldName"
        Assert-MockCalled 'Test-Connection' -Times 1 -Scope It 
    }
}

TryToRenameComputer.ps1

function TryToRenameComputer {
    param([parameter(Mandatory=$true)]
            [string]$computerName)

    if (!(Test-Connection -ComputerName $computerName -Quiet)) {
        exit
    }
}

it skips the it-statement and shows me no errors. Only "Describing Test Error Handling".

Expected Result:

Actual Result:

I already tried running a other Function and it worked. Also when I am running multiple it-statements all get skipped when I call the Function in 1 it-statement. I also tried rewriting it so it is no function anymore and it worked.