Possible to test log warnings for unit tests in PHPUnit? - phpunit

Is it possible to test for log warnings while running tests for PHPUnit? Basically I have a function that logs a warning in our log files and I was wondering if there is a way to test that in PHPUnit.
Kindly note that this is not a PHP warning and I only want to test this specific warning. The result that I get back for the function that I am writing unit tests for doesn't contain information that would allow me to test whether the warning was logged or not.
I would be much obliged if someone can direct me in the right direction for this if it's possible to do.
Thanks in advance! :)

I am not 100% sure what you are after from your question, but it sounds like you may be looking for a way to mock the file system.
PHPUnit can work with vfsstream to do this. The PHPUnit manual gives some guidance on this.

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