diff --git a/tests/Unit/MollieAmountFormatTest.php b/tests/Unit/MollieAmountFormatTest.php
new file mode 100644
index 000000000000..147d4e21218b
--- /dev/null
+++ b/tests/Unit/MollieAmountFormatTest.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+
+class MollieAmountFormatTest extends TestCase
+{
+    /**
+     * @covers \App\PaymentDrivers\MolliePaymentDriver::convertToMollieAmount() 
+     */
+    public function testFormatterIsWorkingCorrectly()
+    {
+        $this->assertEquals('1000.00', \number_format((float) 1000, 2, '.', ''));
+
+        $this->assertEquals('1000.00', \number_format((float) "1000", 2, '.', ''));
+
+        $this->assertEquals('1000.00', \number_format((float) "1000.00", 2, '.', ''));
+
+        $this->assertEquals('1000.00', \number_format((float) "1000.00000", 2, '.', ''));
+    }
+}