Today I came across an error in a Laravel application that runs Telescope that when I run PHPUnit I was getting this error:
1) Tests\Unit\ExampleTest::testBasicTest ReflectionException: Class env does not exist
The solution to fix this is to open phpunit.xml and add the below line in the php section.
<env name="TELESCOPE_ENABLED" value="false"/>
This disables Telescope and allows your test suite to run.