diff --git a/tests/StringsTest.php b/tests/StringsTest.php
index 1b9c666..e982e18 100644
--- a/tests/StringsTest.php
+++ b/tests/StringsTest.php
@@ -58,9 +58,10 @@
 });
 
 test('test random() method', function (): void {
-    $this->assertNotEquals(Strings::create()->random(0), Strings::create()->random(0));
+    $this->assertTrue(is_string(Strings::create()->random(0)->toString()));
+    $this->assertStringContainsString(Strings::create()->random(0)->toString(), '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
     $this->assertNotEquals(Strings::create()->random(), Strings::create()->random());
-    $this->assertNotEquals(Strings::create()->random(10), Strings::create()->random(10));
+    $this->assertNotEquals(Strings::create()->random(100), Strings::create()->random(100));
     $this->assertNotEquals(Strings::create()->random(10, '0123456789'), Strings::create()->random(10, '0123456789'));
     $this->assertEquals(10, Strings::create(Strings::create()->random(10, '0123456789'))->length());
 });