diff --git a/config/level/guzzle/guzzle50.yml b/config/level/guzzle/guzzle50.yml
new file mode 100644
index 00000000000..0c31d4eea05
--- /dev/null
+++ b/config/level/guzzle/guzzle50.yml
@@ -0,0 +1,5 @@
+services:
+    Rector\Rector\Function_\FunctionToMethodCallRector:
+        $functionToMethodCall:
+            'GuzzleHttp\json_decode': ['GuzzleHttp\Utils', 'jsonDecode']
+            'GuzzleHttp\get_path': ['GuzzleHttp\Utils': 'getPath']
diff --git a/tests/Rector/Function_/FunctionToStaticCallRector/FunctionToMethodCallRectorTest.php b/tests/Rector/Function_/FunctionToStaticCallRector/FunctionToStaticCallRectorTest.php
similarity index 85%
rename from tests/Rector/Function_/FunctionToStaticCallRector/FunctionToMethodCallRectorTest.php
rename to tests/Rector/Function_/FunctionToStaticCallRector/FunctionToStaticCallRectorTest.php
index 882ebfa3f7d..8d592e3a4e9 100644
--- a/tests/Rector/Function_/FunctionToStaticCallRector/FunctionToMethodCallRectorTest.php
+++ b/tests/Rector/Function_/FunctionToStaticCallRector/FunctionToStaticCallRectorTest.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 
-namespace Rector\Tests\Rector\Function_\FunctionToMethodCallRector;
+namespace Rector\Tests\Rector\Function_\FunctionToStaticCallRector;
 
 use Iterator;
 use Rector\Testing\PHPUnit\AbstractRectorTestCase;
@@ -8,7 +8,7 @@ use Rector\Testing\PHPUnit\AbstractRectorTestCase;
 /**
  * @see \Rector\Rector\Function_\FunctionToStaticCallRector
  */
-final class FunctionToMethodCallRectorTest extends AbstractRectorTestCase
+final class FunctionToStaticCallRectorTest extends AbstractRectorTestCase
 {
     /**
      * @dataProvider provideWrongToFixedFiles()