diff --git a/src/Psalm/Internal/CliUtils.php b/src/Psalm/Internal/CliUtils.php
index a8bfa216efd..24f7778460d 100644
--- a/src/Psalm/Internal/CliUtils.php
+++ b/src/Psalm/Internal/CliUtils.php
@@ -589,7 +589,12 @@ public static function getPathToConfig(array $options): ?string
      */
     public static function getMemoryLimitInBytes(): int
     {
-        $limit = ini_get('memory_limit');
+        return self::convertMemoryLimitToBytes(ini_get('memory_limit'));
+    }
+
+    /** @psalm-pure */
+    public static function convertMemoryLimitToBytes(string $limit): int
+    {
         // for unlimited = -1
         if ($limit < 0) {
             return -1;
diff --git a/tests/CommandFunctions/GetMemoryLimitInBytesTest.php b/tests/CommandFunctions/GetMemoryLimitInBytesTest.php
index 006fc679bdd..70ceb7dcb9e 100644
--- a/tests/CommandFunctions/GetMemoryLimitInBytesTest.php
+++ b/tests/CommandFunctions/GetMemoryLimitInBytesTest.php
@@ -1,27 +1,11 @@
 <?php
+
 namespace Psalm\Tests\CommandFunctions;
 
 use Psalm\Internal\CliUtils;
 
-use function ini_get;
-use function ini_set;
-
-/**
- * testcase for src/command_functions.php
- */
 class GetMemoryLimitInBytesTest extends \Psalm\Tests\TestCase
 {
-    /**
-     * @var string
-     */
-    private $previousLimit;
-
-    public function setUp(): void
-    {
-        $this->previousLimit = (string)ini_get('memory_limit');
-        parent::setUp();
-    }
-
     /**
      * @return array<int,array<string|int>>
      */
@@ -56,19 +40,15 @@ public function memoryLimitSettingProvider(): array
      *
      * @param int|string $setting
      * @param int|string $expectedBytes
-     *
      */
     public function testGetMemoryLimitInBytes(
         $setting,
         $expectedBytes
     ): void {
-        ini_set('memory_limit', (string)$setting);
-        $this->assertSame($expectedBytes, CliUtils::getMemoryLimitInBytes(), 'Memory limit in bytes does not fit setting');
-    }
-
-    public function tearDown(): void
-    {
-        ini_set('memory_limit', $this->previousLimit);
-        parent::tearDown();
+        $this->assertSame(
+            $expectedBytes,
+            CliUtils::convertMemoryLimitToBytes((string)$setting),
+            'Memory limit in bytes does not fit setting'
+        );
     }
 }