ACP2E-707 Credit memo Refund Shipping (Incl. Tax) shows -0.01

Author: Chhandak.Barua

app/code/Magento/Sales/Model/Order/Creditmemo/Total/Shipping.php

@@ -146,10 +146,10 @@ private function getTaxConfig()
     /**
      * Get base allowed amount including Tax.
      *
+     * @param float $baseAllowedAmountInclTaxDiff
      * @return float
-     *
      */
-    private function getBaseAllowedAmountInclTax($baseAllowedAmountInclTaxDiff)
+    private function getBaseAllowedAmountInclTax(float $baseAllowedAmountInclTaxDiff)
     {
         return ($baseAllowedAmountInclTaxDiff > 0) ? $baseAllowedAmountInclTaxDiff : 0;
     }

app/code/Magento/Sales/Test/Unit/Model/Order/Creditmemo/Total/ShippingTest.php

@@ -486,7 +486,10 @@ public function testCollectRefundShippingAmountIncTax()
             ->method('setBaseGrandTotal')
             ->with($expectedBaseGrandTotal)
             ->willReturnSelf();
-        $this->assertEquals(0, $this->shippingCollector->getBaseAllowedAmountInclTax($expectedBaseShippingAmountInclTax));
+        $this->assertEquals(
+            0,
+            $this->shippingCollector->getBaseAllowedAmountInclTax($expectedBaseShippingAmountInclTax)
+        );
         $this->shippingCollector->collect($this->creditmemoMock);
     }
 }