diff --git a/composer.json b/composer.json
index 5c7ba8e..e6f98cd 100644
--- a/composer.json
+++ b/composer.json
@@ -36,6 +36,7 @@
     "autoload": {
         "classmap": ["App.php","SeacmsAppPlugin.php"],
         "psr-4": {
+            "SeaCMS\\App\\Test\\": "tests",
             "SeaCMS\\App\\": "src"
         }
     },
diff --git a/tests/AppTest.php b/tests/AppTest.php
index f207b99..4aa797d 100644
--- a/tests/AppTest.php
+++ b/tests/AppTest.php
@@ -8,12 +8,18 @@
 namespace SeaCMS\App\Test;
 
 use SeaCMS\App;
-use PHPUnit\Framework\TestCase;
+use SeaCMS\App\Test\Common;
 
-final class AppTest extends TestCase {
+final class AppTest extends Common {
 
     public function testSuccess(): void
     {
+        $this->defineServer(
+            true,
+            'index.php',
+            '/',
+            ''
+        );
         $app = new App('');
         $output = $app->runPico();
         $this->assertTrue($app instanceof App);
diff --git a/tests/Common.php b/tests/Common.php
new file mode 100644
index 0000000..ca5d756
--- /dev/null
+++ b/tests/Common.php
@@ -0,0 +1,136 @@
+<?php
+
+/**
+ * SPDX-License-Identifier: EUPL-1.2
+ * Authors: see /README.md
+ */
+
+namespace SeaCMS\App\Test;
+
+use SeaCMS\App;
+use PHPUnit\Framework\TestCase;
+
+abstract class Common extends TestCase {
+
+    /**
+     * define $_SERVER because fastcgi not run in CLI
+     * @param bool $reset reset previous $_SERVER
+     * @param string $filePath realpath of current script file
+     * @param string $shortScriptName uri path of current script file
+     * @param string $queryString wanted query string
+     * @param string $method
+     * @param string $pathInfo
+     */
+    public function defineServer(
+        bool $reset,
+        string $filePath,
+        string $shortScriptName,
+        string $queryString,
+        string $method = 'GET',
+        string $pathInfo = ''
+    )
+    {
+        if (is_file($filePath)){
+            if (!is_array($_SERVER) || $reset){
+                $new = [];
+                if (is_array($_SERVER)){
+                    foreach(['SERVER_SOFTWARE','SERVER_PROTOCOL','GATEWAY_INTERFACE'] as $key){
+                        if (array_key_exists($key,$_SERVER)){
+                            $new[$key] = $_SERVER[$key];
+                        }
+                    }
+                }
+                $_SERVER = $new;
+            }
+            $_SERVER['QUERY_STRING'] = $queryString;
+            $_SERVER['REQUEST_METHOD'] = in_array($method,['GET','POST','PUT','DELETE','HEAD']) ? $method : 'GET';
+            // $_SERVER['CONTENT_TYPE'] = 'not defined';
+            // $_SERVER['CONTENT_LENGTH'] = 'not defined';
+    
+            $documentRoot = dirname(realpath($filePath));
+            $fileName = basename(realpath($filePath));
+            $documentRootShort = (substr($documentRoot,-strlen(DIRECTORY_SEPARATOR)) != DIRECTORY_SEPARATOR)
+                ? $documentRoot
+                : substr($documentRoot,0,-strlen(DIRECTORY_SEPARATOR));
+            $documentRootFull = $documentRootShort.DIRECTORY_SEPARATOR;
+
+            $scriptName = (basename($shortScriptName) == $fileName)
+                ? $shortScriptName
+                : $shortScriptName.((empty($shortScriptName) || substr($shortScriptName,-1) == '/') ? '' : '/').$fileName;
+
+            $hashPos = strpos($queryString,'#');
+            $queryStringWithoutHash = 
+                (empty($queryString) || ($hashPos === 0))
+                ? ''
+                : (
+                    ($hashPos === false)
+                    ? "?$queryString"
+                    : '?'.sustr($queryString,0,$hashPos+1)
+                );
+    
+            $_SERVER['SCRIPT_FILENAME'] = $documentRootFull.$fileName;
+            $_SERVER['SCRIPT_NAME'] = $scriptName;
+            $_SERVER['PHP_SELF'] = $scriptName.$pathInfo;
+            $_SERVER['PATH_INFO'] = $pathInfo;
+            $_SERVER['ORIG_PATH_INFO'] = $pathInfo;
+            $_SERVER['PATH_TRANSLATED'] = $documentRootShort.$pathInfo;
+            if (substr($shortScriptName,-1) == '/'){
+                if (!empty($pathInfo) && substr($pathInfo,0,1) == '/'){
+                    $_SERVER['DOCUMENT_URI'] = $shortScriptName.substr($pathInfo,1);
+                } else {
+                    $_SERVER['DOCUMENT_URI'] = $shortScriptName.$pathInfo;
+                }
+            } else if (empty($pathInfo) || substr($pathInfo,0,1) == '/'){
+                $_SERVER['DOCUMENT_URI'] = $shortScriptName.$pathInfo;
+            } else {
+                $_SERVER['DOCUMENT_URI'] = $shortScriptName.'/'.$pathInfo;
+            }
+            $_SERVER['REQUEST_URI'] = $_SERVER['DOCUMENT_URI'].$queryStringWithoutHash; 
+            $_SERVER['DOCUMENT_ROOT'] = $documentRootShort; 
+            $_SERVER['REMOTE_ADDR'] = '127.0.0.1';  // forced
+            $_SERVER['REMOTE_PORT'] = '80';         // forced
+            $_SERVER['SERVER_ADDR'] = '127.0.0.1';  // forced
+            $_SERVER['SERVER_ADDR'] = '80';         // forced
+            $_SERVER['SERVER_NAME'] = 'localhost';  // forced
+            $_SERVER['HTTPS'] = null;               // forced
+        }
+    }
+
+    /**
+     * save previous $_SERVER in $GLOBALS if existing
+     */
+    public function saveSERVER()
+    {
+        if (!isset($GLOBALS['savedSERVER'])){
+            $GLOBALS['savedSERVER'] = [
+                'saved' => false,
+                'value' => null
+            ];
+        }
+        if (!$GLOBALS['savedSERVER']['saved']){
+            if (!isset($_SERVER)){
+                $GLOBALS['savedSERVER']['value'] = null;
+                $GLOBALS['savedSERVER']['saved'] = true;
+            } else {
+                $GLOBALS['savedSERVER']['value'] = $_SERVER;
+                $GLOBALS['savedSERVER']['saved'] = true;
+            }
+        }
+    }
+
+    /**
+     * revert previous $_SERVER in $GLOBALS if existing
+     */
+    public function revertSERVER()
+    {
+        if (isset($GLOBALS['savedSERVER']['saved']) && $GLOBALS['savedSERVER']['saved']){
+            if (is_null($GLOBALS['savedSERVER']['value'])){
+                unset($_SERVER);
+            } else {
+                $_SERVER = $GLOBALS['savedSERVER']['value'];
+            }
+            $GLOBALS['savedSERVER']['saved'] = false;
+            $GLOBALS['savedSERVER']['value'] = null;
+        }
+    }
+}
\ No newline at end of file