You may not have the xdebug PHP extension enabled. When I run the tests without xdebug enabled on PHPUnit 4.8.26, I get this message:
Warning: The Xdebug extension is not loaded
No code coverage will be generated.
It looks like VVV comes with xdebug though, so it is probably enabled by default. But perhaps you disabled it somehow?
To check if xdebug is enabled you can run php --ri xdebug. That should show you the xdebug settings, if the extension is currently enabled.
If the extension is enabled, then maybe you haven’t configured a whitelist within your configuration file. Take a look at those docs if you haven’t already, as they outline the steps needed to generate code coverage data with PHPUnit.
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