diff --git a/tests/Unit/ZeroDecimalTest.php b/tests/Unit/ZeroDecimalTest.php
index ca0ed4534010..4bd94103d1b7 100644
--- a/tests/Unit/ZeroDecimalTest.php
+++ b/tests/Unit/ZeroDecimalTest.php
@@ -37,5 +37,22 @@ class ZeroDecimalTest extends TestCase
 
     }
 
+
+    public function testCurrencyMiss()
+    {
+
+        $this->assertFalse(in_array("USD", $this->currencies));
+
+    }
+
+    public function testCurrencyNotexist()
+    {
+
+        $this->assertFalse(in_array("USDddd", $this->currencies));
+
+    }
+
+
+
 }