Why does running phpunit with Laravel return "no tests executed"?

I recently downloaded a fresh setup of Laravel 5.7 and have tried running the phpunit command at the command prompt with the basic settings, but it always comes through with "No tests executed"

Yet it has default tests that should run. Below is the snapshot of the folder setup and phpunit.xml.

What am I missing?

I am running the setup on xampp v3.2.2

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