diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 00000000..76b70f89
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" bootstrap="./phpunit/bootstrap.php" colors="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd" cacheDirectory=".phpunit.cache" backupStaticProperties="false">
+  <testsuites>
+    <testsuite name="Tests">
+      <directory suffix="Test.php">./phpunit</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>
diff --git a/phpunit/bootstrap.php b/phpunit/bootstrap.php
new file mode 100644
index 00000000..9bbaf678
--- /dev/null
+++ b/phpunit/bootstrap.php
@@ -0,0 +1,9 @@
+<?php
+
+
+use PhpAot\Php\CompilerTest;
+
+require __DIR__ . '/../bin/bootstrap.php';
+
+CompilerTest::getInstance(ROOT_PATH);
+
diff --git a/phpunit/code/duplicate.php b/phpunit/code/duplicate.php
new file mode 100644
index 00000000..0acae66b
--- /dev/null
+++ b/phpunit/code/duplicate.php
@@ -0,0 +1,6 @@
+<?php
+function main()
+{
+    static $a = 10;
+    static $a = 11;
+}
\ No newline at end of file
diff --git a/phpunit/src/ErrorTest.php b/phpunit/src/ErrorTest.php
new file mode 100644
index 00000000..a0230087
--- /dev/null
+++ b/phpunit/src/ErrorTest.php
@@ -0,0 +1,23 @@
+<?php
+
+
+use PhpAot\Php\CompilerTest;
+use PhpAot\Php\Exception\TestError;
+use PHPUnit\Framework\TestCase;
+
+class ErrorTest extends TestCase
+{
+    public function testDuplicateStaticVar()
+    {
+        try {
+            $o = CompilerTest::getInstance();
+            $file = __DIR__ . '/../code/duplicate.php';
+            $o->addFiles([$file]);
+            $o->convert($file);
+        } catch (TestError $exception) {
+            $this->assertStringContainsString('Duplicate static variable', $exception->getMessage());
+            return;
+        }
+        $this->fail();
+    }
+}
diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 0fbae6a9..ccf0396e 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -19,6 +19,7 @@ use PhpAot\Php\Exception\DynamicCall;
 use PhpAot\Php\Exception\PlaceHolder;
 use PhpAot\Php\Exception\Redo;
 use PhpAot\Php\Exception\Skip;
+use PhpAot\Php\Exception\TestError;
 use PhpAot\Php\Generator\ClosureGenerator;
 use PhpAot\Php\Generator\PlaceHolderGenerator;
 use PhpAot\Php\Generator\PropertyPromotion;
@@ -244,6 +245,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected bool $defaultNativeType = false;
     protected bool $stubFile = false;
     protected bool $enableProfiler = false;
+    protected bool $forTest = false;
     protected Parser $parser;
     protected PrettyPrinter $printer;
 
@@ -1567,6 +1569,9 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected function addStaticVar(string $name, string $type): void
     {
         $this->context->staticVars[$name] = $type;
+        if ($this->hasStaticVar($name)) {
+            $this->error('Duplicate static variable `$' . $name . '`');
+        }
         $this->addGlobalVar($this->getStaticVarName($name), $type);
     }
 
@@ -2175,9 +2180,13 @@ class CompilerBase extends \PhpAot\Core\Translator
 
     protected function error(string $msg): never
     {
-        $this->climate->red("Fatal error: {$msg}");
-        debug_print_backtrace();
-        exit(255);
+        if ($this->forTest) {
+            throw new TestError($msg);
+        } else {
+            $this->climate->red("Fatal error: {$msg}");
+            debug_print_backtrace();
+            exit(255);
+        }
     }
 
     protected function fatalError(Node $node, string $msg): never
diff --git a/src/Php/CompilerTest.php b/src/Php/CompilerTest.php
new file mode 100644
index 00000000..488671ce
--- /dev/null
+++ b/src/Php/CompilerTest.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * This file is part of Swoole-Compiler(AOT).
+ *
+ * @link     https://www.swoole.com/
+ * @contact  service@swoole.com
+ */
+
+namespace PhpAot\Php;
+
+class CompilerTest extends Translator
+{
+    protected static ?self $instance = null;
+
+    public static function getInstance(string $rootPath = ''): CompilerTest
+    {
+        if (!self::$instance) {
+            self::$instance = new self($rootPath);
+            self::$instance->forTest = true;
+        }
+        return self::$instance;
+    }
+}
diff --git a/src/Php/Exception/TestError.php b/src/Php/Exception/TestError.php
new file mode 100644
index 00000000..a107cbc2
--- /dev/null
+++ b/src/Php/Exception/TestError.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace PhpAot\Php\Exception;
+
+class TestError extends \RuntimeException
+{
+
+}
\ No newline at end of file
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index da4b0bed..41a136d5 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -99,6 +99,7 @@ class Translator extends Preprocessor
 
     public function convert(string $file): string
     {
+        $file = realpath($file);
         if ($this->hasCppFileCache($file)) {
             $this->climate->darkGray('skip: ' . $file . ', cache exists');
 
@@ -148,6 +149,11 @@ class Translator extends Preprocessor
         $this->targetName = $name;
     }
 
+    public function addFiles(array $files): void
+    {
+        $this->sourceDirs = array_merge($this->sourceDirs, $files);
+    }
+
     public function getFiles(string $path): array
     {
         $realpath = realpath($path);
diff --git a/tests/core/lang/static_basic_001.phpt b/tests/core/lang/static_basic_001.phpt
new file mode 100644
index 00000000..80802f30
--- /dev/null
+++ b/tests/core/lang/static_basic_001.phpt
@@ -0,0 +1,87 @@
+--TEST--
+Static keyword - basic tests
+--FILE--
+<?php
+function staticNonStatic() {
+    echo "---------\n";
+    $a=0;
+    echo "$a\n";
+    static $a=10;
+    echo "$a\n";
+    $a++;
+}
+
+function manyInits() {
+    static $counter=0;
+    echo "------------- Call $counter --------------\n";
+    static $a, $b=10, $c=20, $d, $e=30;
+    echo "Uninitialized    : $a\n";
+    echo "Initialized to 10: $b\n";
+    echo "Initialized to 20: $c\n";
+    echo "Uninitialized    : $d\n";
+    echo "Initialized to 30: $e\n";
+    $a++;
+    $b++;
+    $c++;
+    $d++;
+    $e++;
+    $counter++;
+}
+
+
+function main() {
+    echo "\nSame variable used as static and non static.\n";
+    staticNonStatic();
+    staticNonStatic();
+    staticNonStatic();
+
+    echo "\nLots of initialisations in the same statement.\n";
+    manyInits();
+    manyInits();
+    manyInits();
+
+    echo "\nUsing static keyword at global scope\n";
+    for ($i=0; $i<3; $i++) {
+       static $s, $k=10;
+       echo "$s $k\n";
+       $s++;
+       $k++;
+    }
+}
+?>
+--EXPECT--
+Same variable used as static and non static.
+---------
+0
+10
+---------
+0
+11
+---------
+0
+12
+
+Lots of initialisations in the same statement.
+------------- Call 0 --------------
+Uninitialized    : 
+Initialized to 10: 10
+Initialized to 20: 20
+Uninitialized    : 
+Initialized to 30: 30
+------------- Call 1 --------------
+Uninitialized    : 1
+Initialized to 10: 11
+Initialized to 20: 21
+Uninitialized    : 1
+Initialized to 30: 31
+------------- Call 2 --------------
+Uninitialized    : 2
+Initialized to 10: 12
+Initialized to 20: 22
+Uninitialized    : 2
+Initialized to 30: 32
+
+Using static keyword at global scope
+ 10
+1 11
+2 12