Update testing.md

ntheapp · Feb 13, 2018 · 78fae05 · 78fae05
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@@ -18,6 +18,8 @@ An `ExampleTest.php` file is provided in both the `Feature` and `Unit` test dire
 
 When running tests via `phpunit`, Laravel will automatically set the configuration environment to `testing` because of the environment variables defined in the `phpunit.xml` file. Laravel also automatically configures the session and cache to the `array` driver while testing, meaning no session or cache data will be persisted while testing.
 
+You may also create a `.env.testing` file. This file will override the `.env` file when running PHPUnit tests or executing Artisan commands with the `--env=testing` option.
+
 You are free to define other testing environment configuration values as necessary. The `testing` environment variables may be configured in the `phpunit.xml` file, but make sure to clear your configuration cache using the `config:clear` Artisan command before running your tests!
 
 <a name="creating-and-running-tests"></a>