Powershell - "Supply Values for the following parameters"

Noob to PS, but I know bash and batch.

I'm trying to do a simple script that tests the existence of a file and then creates another depending on the outcome, but prompts me for a parameter value after running it.

Code:

Code:

function test-existence {
if(test-path -path "C:\testran.flag") {echo > C:\users\admin\desktop\true.flag}
if(!(test-path -path "C:\testfailed.flag")) {echo > C:\users\admin\desktop\false.flag}
test-existence

I've tried running it as a function and just as a two line script, but it still produces the same result.

Prompt:

Supply values for the following parameters:
InputObject[0]:

This is part of a fully automated setup so I need this to run without any user interaction.


Thanks.

Thanks :)