PHPUnit settings are not configured.

To configure PHPUnit settings, you can follow these steps:

1. Install PHPUnit globally using Composer by running the following command in your terminal:

composer global require phpunit/phpunit

2. Add the Composer's global vendor directory to your PATH environment variable. You can do this by adding the following line to your `~/.bashrc` or `~/.bash_profile` file:

export PATH="$PATH:$HOME/.composer/vendor/bin"

3. Check if PHPUnit has been installed correctly by running the following command:

phpunit --version

4. Set up the PHPUnit configuration file by running the following command:

phpunit --generate-config

5. Customize the configuration file as per your project requirements.

Once you have completed these steps, PHPUnit should be ready to use in your project.