diff --git a/docker/tests/init.sh b/docker/tests/init.sh
index 9e37faeb..6c1e6e3c 100755
--- a/docker/tests/init.sh
+++ b/docker/tests/init.sh
@@ -1,114 +1,113 @@
 #!/bin/bash
 set -e
 set -x
 
 rsync -av \
     --exclude=vendor \
     --exclude=composer.lock \
     --exclude=node_modules \
     --exclude=package-lock.json \
     --exclude=public \
     --exclude=storage \
     --exclude=resources/build \
-    --exclude=bootstrap \
     --exclude=.gitignore \
     /src/kolabsrc.orig/ /opt/app-root/src/ | tee /tmp/rsync.output
 
 cd /opt/app-root/src/
 
 if [ "$1" == "--refresh" ]; then
     /update.sh
     shift
 fi
 
 ./artisan route:list
 
 EXCLUDE_GROUPS=${EXCLUDE_GROUPS:-"skipci,ldap,coinbase,mollie,stripe,meet,dns,slow"}
 
 if [ "$1" == "browsertest" ]; then
     ./artisan octane:start --port=80 &
     echo "127.0.0.1 kolab.local admin.kolab.local reseller.kolab.local" >> /etc/hosts
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --testsuite Browser
 elif [ "$1" == "testsuite" ]; then
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --testsuite Unit
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --testsuite Functional
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --testsuite Feature
 elif [ "$1" == "quicktest" ]; then
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --stop-on-defect \
         --stop-on-error \
         --stop-on-failure \
         --testsuite Unit
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --stop-on-defect \
         --stop-on-error \
         --stop-on-failure \
         --testsuite Functional
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --stop-on-defect \
         --stop-on-error \
         --stop-on-failure \
         --testsuite Feature
 elif [ "$1" == "shell" ]; then
     exec /bin/bash
 elif [ "$1" == "lint" ]; then
     php -dmemory_limit=-1 vendor/bin/phpcs -p
 
     php -dmemory_limit=-1 vendor/bin/phpstan analyse
 
     npm run lint
 else
 
     if [[ "$1" =~ "Browser" ]]; then
         echo "Assuming a browsertest and starting octane"
         ./artisan octane:start --port=80 &
         echo "127.0.0.1 kolab.local admin.kolab.local reseller.kolab.local" >> /etc/hosts
     fi
 
     php \
         -dmemory_limit=-1 \
         vendor/bin/phpunit \
         --exclude-group "$EXCLUDE_GROUPS" \
         --verbose \
         --stop-on-defect \
         --stop-on-error \
         --stop-on-failure \
         $@
 fi
diff --git a/src/bootstrap/app.php b/src/bootstrap/app.php
index def6d60c..a70ba683 100644
--- a/src/bootstrap/app.php
+++ b/src/bootstrap/app.php
@@ -1,78 +1,83 @@
 <?php
 
 // Stuff from Roundcube Framework bootstrap required by rcube_* classes
-define('RCUBE_CHARSET', 'UTF-8');
+if (!defined('RCUBE_CHARSET')) {
+    define('RCUBE_CHARSET', 'UTF-8');
+}
 
-/**
- * Get first element from an array
- *
- * @param array $array Input array
- *
- * @return mixed First element if found, Null otherwise
- */
-function array_first($array)
-{
-    // @phpstan-ignore-next-line
-    if (is_array($array) && !empty($array)) {
-        reset($array);
-        foreach ($array as $element) {
-            return $element;
+// This function is defined by phpunit as well
+if (!function_exists("array_first")) {
+    /**
+    * Get first element from an array
+    *
+    * @param array $array Input array
+    *
+    * @return mixed First element if found, Null otherwise
+    */
+    function array_first($array)
+    {
+        // @phpstan-ignore-next-line
+        if (is_array($array) && !empty($array)) {
+            reset($array);
+            foreach ($array as $element) {
+                return $element;
+            }
         }
-    }
 
-    return null;
+        return null;
+    }
 }
 
 /*
 |--------------------------------------------------------------------------
 | Create The Application
 |--------------------------------------------------------------------------
 |
 | The first thing we will do is create a new Laravel application instance
 | which serves as the "glue" for all the components of Laravel, and is
 | the IoC container for the system binding all of the various parts.
 |
 */
 
 $app = new Illuminate\Foundation\Application(
     $_ENV['APP_BASE_PATH'] ?? dirname(__DIR__)
 );
 
 /*
 |--------------------------------------------------------------------------
 | Bind Important Interfaces
 |--------------------------------------------------------------------------
 |
 | Next, we need to bind some important interfaces into the container so
 | we will be able to resolve them when needed. The kernels serve the
 | incoming requests to this application from both the web and CLI.
 |
 */
 
 $app->singleton(
     Illuminate\Contracts\Http\Kernel::class,
     App\Http\Kernel::class
 );
 
 $app->singleton(
     Illuminate\Contracts\Console\Kernel::class,
     App\Console\Kernel::class
 );
 
 $app->singleton(
     Illuminate\Contracts\Debug\ExceptionHandler::class,
     App\Exceptions\Handler::class
 );
 
 /*
 |--------------------------------------------------------------------------
 | Return The Application
 |--------------------------------------------------------------------------
 |
 | This script returns the application instance. The instance is given to
 | the calling script so we can separate the building of the instances
 | from the actual running of the application and sending responses.
 |
 */
 
 return $app;