add phpunit listener

phpunit.xml

@@ -22,12 +22,16 @@
             <directory suffix=".php">./app</directory>
         </whitelist>
     </filter>
+    <listeners>
+        <listener class="Tests\Listener" />
+    </listeners>
     <php>
         <server name="APP_ENV" value="testing"/>
         <server name="BCRYPT_ROUNDS" value="4"/>
         <server name="CACHE_DRIVER" value="array"/>
         <server name="MAIL_DRIVER" value="array"/>
         <server name="QUEUE_CONNECTION" value="sync"/>
         <server name="SESSION_DRIVER" value="array"/>
+        <server name="APP_CONFIG_CACHE" value="bootstrap/cache/config.phpunit.php" />
     </php>
 </phpunit>

tests/Listener.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Tests;
+
+use PHPUnit\Framework\TestSuite;
+use PHPUnit\Framework\TestListener;
+use Illuminate\Contracts\Console\Kernel;
+use PHPUnit\Framework\TestListenerDefaultImplementation;
+
+class Listener implements TestListener
+{
+    use CreatesApplication, TestListenerDefaultImplementation;
+
+    /**
+     * Indicates if the listener has already run.
+     *
+     * @var bool
+     */
+    protected $alreadyRun = false;
+
+    /**
+     * Called at the start of the test suite.
+     *
+     * @param  \PHPUnit\Framework\TestSuite  $suite
+     * @return void
+     */
+    public function startTestSuite(TestSuite $suite): void
+    {
+        if ($this->alreadyRun) {
+            return;
+        }
+
+        $this->createApplication()
+            ->make(Kernel::class)
+            ->call('config:cache');
+
+        $this->alreadyRun = true;
+    }
+}