diff --git a/tests/AbstractTest.php b/tests/AbstractTest.php
index fcbc5220..6810a7a0 100644
--- a/tests/AbstractTest.php
+++ b/tests/AbstractTest.php
@@ -79,4 +79,17 @@ protected function getSandboxRoot()
     {
         return __DIR__."/sandbox";
     }
+
+    /**
+     * Generate a random string.
+     *
+     * @param int $length
+     *   The desired length.
+     *
+     * @return string
+     *   The random string.
+     */
+    protected function generateRandomString($length = 10) {
+        return substr(str_shuffle(str_repeat($x = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil($length/strlen($x)))), 1, $length);
+    }
 }
diff --git a/tests/CommandsTest.php b/tests/CommandsTest.php
index d3948abb..09a5d152 100644
--- a/tests/CommandsTest.php
+++ b/tests/CommandsTest.php
@@ -146,7 +146,7 @@ public function testSettingsSetup(array $config, array $expected)
 
         file_put_contents($configFile, Yaml::dump($config));
 
-        $sites_subdir = isset($config['drupal']['site']['sites_subdir']) ? $config['drupal']['site']['sites_subdir'] : 'default';
+        $sites_subdir = $config['drupal']['site']['sites_subdir'] ?? 'default';
         mkdir($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/', 0777, true);
         file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/default.settings.php', '');
 
@@ -158,6 +158,29 @@ public function testSettingsSetup(array $config, array $expected)
             $content = file_get_contents($this->getSandboxFilepath($row['file']));
             $this->assertContainsNotContains($content, $row);
         }
+
+        // Generate a random function name.
+        $fct = $this->generateRandomString(20);
+
+        // Generate a dummy PHP code.
+        $config_override_dummy_script = <<< EOF
+<?php 
+function $fct() {}
+EOF;
+
+        $config_override_filename = $config['drupal']['site']['settings_override_file'] ?? 'settings.override.php';
+
+        // Add the dummy PHP code to the config override file.
+        file_put_contents(
+            $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename,
+            $config_override_dummy_script
+        );
+
+        // Include the config override file.
+        include_once $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename;
+
+        // Test if the dummy PHP code has been properly included.
+        $this->assertTrue(\function_exists($fct));
     }
 
     /**
@@ -171,7 +194,7 @@ public function testSettingsSetupForce(array $config, array $expected)
         $configFile = $this->getSandboxFilepath('runner.yml');
         file_put_contents($configFile, Yaml::dump($config));
 
-        $sites_subdir = isset($config['drupal']['site']['sites_subdir']) ? $config['drupal']['site']['sites_subdir'] : 'default';
+        $sites_subdir = $config['drupal']['site']['sites_subdir'] ?? 'default';
         mkdir($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/', 0777, true);
         file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/default.settings.php', '');
         file_put_contents($this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/settings.php', '# Already existing file.');
@@ -184,6 +207,29 @@ public function testSettingsSetupForce(array $config, array $expected)
             $content = file_get_contents($this->getSandboxFilepath($row['file']));
             $this->assertContainsNotContains($content, $row);
         }
+
+        // Generate a random function name.
+        $fct = $this->generateRandomString(20);
+
+        // Generate a dummy PHP code.
+        $config_override_dummy_script = <<< EOF
+<?php 
+function $fct() {}
+EOF;
+
+        $config_override_filename = $config['drupal']['site']['settings_override_file'] ?? 'settings.override.php';
+
+        // Add the dummy PHP code to the config override file.
+        file_put_contents(
+            $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename,
+            $config_override_dummy_script
+        );
+
+        // Include the config override file.
+        include_once $this->getSandboxRoot() . '/build/sites/' . $sites_subdir . '/' . $config_override_filename;
+
+        // Test if the dummy PHP code has been properly included.
+        $this->assertTrue(\function_exists($fct));
     }
 
     /**
diff --git a/tests/fixtures/commands/drupal-settings-setup-force.yml b/tests/fixtures/commands/drupal-settings-setup-force.yml
index ae080c86..31587d65 100644
--- a/tests/fixtures/commands/drupal-settings-setup-force.yml
+++ b/tests/fixtures/commands/drupal-settings-setup-force.yml
@@ -13,5 +13,5 @@
         force: true
   expected:
     - file: "build/sites/default/settings.php"
-      contains: "include $app_root . '/' . $site_path . '/settings.override.php';"
+      contains: "include $app_root . '/' . $site_path . '/' . settings.override.php;"
       not_contains: "# Already existing file."
diff --git a/tests/fixtures/commands/drupal-settings-setup.yml b/tests/fixtures/commands/drupal-settings-setup.yml
index 53938b35..d7d74731 100644
--- a/tests/fixtures/commands/drupal-settings-setup.yml
+++ b/tests/fixtures/commands/drupal-settings-setup.yml
@@ -12,7 +12,7 @@
       contains: "$conf[\"file_scan_ignore_directories\"] = array(0 => 'node_modules',1 => 'bower_components',2 => 'vendor',3 => 'build');"
       not_contains: ~
     - file: "build/sites/default/settings.php"
-      contains: "include $app_root . '/' . $site_path . '/settings.override.php';"
+      contains: "include $app_root . '/' . $site_path . '/' . settings.override.php;"
       not_contains: ~
 
 - configuration:
@@ -47,7 +47,7 @@
       contains: "$settings[\"file_scan_ignore_directories\"] = array(0 => 'build');"
       not_contains: ~
     - file: "build/sites/default/settings.php"
-      contains: "include $app_root . '/' . $site_path . '/settings.overridemeplease.php';"
+      contains: "include $app_root . '/' . $site_path . '/' . settings.overridemeplease.php;"
       not_contains: ~
 
 - configuration:
@@ -64,5 +64,5 @@
       contains: "$settings[\"file_scan_ignore_directories\"] = array(0 => 'build');"
       not_contains: ~
     - file: "build/sites/inea/settings.php"
-      contains: "include $app_root . '/' . $site_path . '/settings.overridemeplease.php';"
+      contains: "include $app_root . '/' . $site_path . '/' . settings.overridemeplease.php;"
       not_contains: ~