Allow Infection to run without a pre-existing Test Framework configuration file

[thompsnm]

Description

My team has implemented a binary that wraps around PHPUnit and configures / executes tests for us when we simply point it at a particular directory. I want to implement an Infection Test Framework extension that we would only use internally that executes tests via our binary. Since our binary dynamically creates a PHPUnit configuration file, there is no existing configuration file to point Infection to. However, when I try to run Infection I get the following error because it requires a configuration file exist:

In FileOrDirectoryNotFound.php line 71:

  The path "/home/nthompson/development/MyApp/modules/ExampleModule" does not contain any of the requested files: "PhpUnitTestRunner.xml", "PhpUnitTestRunner.yml", "PhpUnitTestRunner.xml.dist", "PhpUnitTe
  stRunner.yml.dist", "PhpUnitTestRunner.dist.xml", "PhpUnitTestRunner.dist.yml"

Workaround

If I create a fake, empty configuration file by running the following command then Infection works as expected:

touch modules/ExampleModule/PhpUnitTestRunner.yml

Ideal Solution

I would much prefer to be able to simply turn off the check for a pre-existing configuration file.

Related Context

I also submitted the bug Infection can't run custom Test Framework extensions because TestFrameworkTypes is hardcoded related to other issues I encountered while setting up my Test Framework extension. Whereas that bug will affect anyone trying to create a Test Framework extension, I realize this feature request may be more niche to my use case.