Is it clear to reader when to create the greeter.php file?

[carlhunterroach]

First-time user of this documentation and PHPUnit.

I created GreeterTest.php but when I run it, it doesn't find src/Greeter.php because I haven't created/added it.
Have I missed the instruction or is the instruction missing to create src/Greeter.php?

To reproduce:
Follow the composer sections of installation
And then start writing a test.

[sebastianbergmann]

Thank you for your valuable feedback!