Allow to override .env files per env

phpunit/phpunit/4.7/.env.test

@@ -0,0 +1,4 @@
+# define your env variables for the test env here
+KERNEL_CLASS=App\\Kernel
+APP_SECRET='s$cretf0rt3st'
+SHELL_VERBOSITY=-1

phpunit/phpunit/4.7/manifest.json

@@ -1,5 +1,6 @@
 {
     "copy-from-recipe": {
+        ".env.test": ".env.test",
         "phpunit.xml.dist": "phpunit.xml.dist",
         "tests/": "tests/"
     },

phpunit/phpunit/4.7/phpunit.xml.dist

@@ -2,19 +2,13 @@
 
 <!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.7/phpunit.xsd"
          backupGlobals="false"
          colors="true"
-         bootstrap="vendor/autoload.php"
+         bootstrap="tests/bootstrap.php"
 >
     <php>
         <ini name="error_reporting" value="-1" />
-        <env name="KERNEL_CLASS" value="App\Kernel" />
-        <env name="APP_ENV" value="test" />
-        <env name="APP_DEBUG" value="1" />
-        <env name="APP_SECRET" value="s$cretf0rt3st" />
-        <env name="SHELL_VERBOSITY" value="-1" />
-        <!-- define your env variables for the test env here -->
     </php>
 
     <testsuites>

phpunit/phpunit/4.7/tests/bootstrap.php

@@ -0,0 +1,5 @@
+<?php
+
+require dirname(__DIR__).'/vendor/autoload.php';
+
+App\Kernel::bootstrapEnv('test');