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In PHPUnit, you can set the value of an environment variable while running a test by utilizing the putenv() function.

Here's an example code snippet:

public function testSomething()
{
    putenv('MY_ENV_VAR=some_value');

    // your test code here
}

In this example, we set the value of the MY_ENV_VAR environment variable to 'some_value' using the putenv() function just before the test code is executed.

Note that changes made to environment variables with putenv() during a test will only persist for the duration of the test. Once the test is complete, any changes made to the environment variables will be discarded.