Update tests to handle multiple neutral tax rates and adjust calculations accordingly.

Author: tomkalon

features/managing_invoices/seeing_invoice_with_taxes_included_in_price.feature

@@ -26,7 +26,7 @@ Feature: Seeing included in price taxes on an invoice
         When I view the summary of the invoice for order "#00000666"
         Then it should have 2 "PHP T-Shirt" items with unit net price "48.78", discounted unit net price "48.78", net value "97.56", tax total "22.44" and total "120.00" in "USD" currency
         And it should have 2 "Symfony Mug" items with unit net price "36.36", discounted unit net price "36.36", net value "72.72", tax total "7.28" and total "80.00" in "USD" currency
-        And it should have 1 "Symfony Mug" items with unit net price "36.37", discounted unit net price "36.37", net value "36.37", tax total "3.63" and total "40.00" in "USD" currency
+        And it should have 1 "Symfony Mug" items with unit net price "36.36", discounted unit net price "36.37", net value "36.37", tax total "3.63" and total "40.00" in "USD" currency
         And it should have a tax item "23%" with amount "22.44" in "USD" currency
         And it should have a tax item "10%" with amount "10.91" in "USD" currency
         And its net total should be "216.65" in "USD" currency

features/managing_invoices/seeing_invoice_with_taxes_included_in_price_and_promotions_applied.feature

@@ -22,6 +22,6 @@ Feature: Seeing included in price taxes and promotions applied on an invoice
 
     Scenario: Seeing proper taxes and promotions on an invoice
         When I view the summary of the invoice for order "#00000666"
-        Then it should have 2 "PHP T-Shirt" items with unit net price "50.65", discounted unit net price "40.65", net value "81.30", tax total "18.70" and total "100.00" in "USD" currency
+        Then it should have 2 "PHP T-Shirt" items with unit net price "48.78", discounted unit net price "40.65", net value "81.30", tax total "18.70" and total "100.00" in "USD" currency
         And it should have a tax item "23%" with amount "18.70" in "USD" currency
         And its total should be "110.00" in "USD" currency

src/Provider/UnitNetPriceProvider.php

@@ -42,6 +42,6 @@ public function getUnitNetPrice(OrderItemUnitInterface $orderItemUnit): int
 
         $taxDivisor = 1.0 + $taxRate;
 
-        return (int) round($unitPrice / $taxDivisor, 0, PHP_ROUND_HALF_UP);
+        return (int) round($unitPrice / $taxDivisor, 0, \PHP_ROUND_HALF_UP);
     }
 }

tests/Unit/Provider/UnitNetPriceProviderTest.php

@@ -46,19 +46,19 @@ public function it_provides_net_price_for_unit_with_taxes_included_in_price(): v
         $taxAdjustment = $this->createMock(AdjustmentInterface::class);
 
         $unit->method('getOrderItem')->willReturn($orderItem);
-        $orderItem->method('getUnitPrice')->willReturn(1000);
+        $orderItem->method('getUnitPrice')->willReturn(1200);
 
         $unit
             ->method('getAdjustments')
             ->with(AdjustmentInterface::TAX_ADJUSTMENT)
             ->willReturn(new ArrayCollection([$taxAdjustment]));
 
         $taxAdjustment->method('isNeutral')->willReturn(true);
-        $taxAdjustment->method('getAmount')->willReturn(200);
+        $taxAdjustment->method('getDetails')->willReturn(['taxRateAmount' => 0.20]);
 
         $result = $this->provider->getUnitNetPrice($unit);
 
-        self::assertSame(800, $result);
+        self::assertSame(1000, $result);
     }
 
     #[Test]
@@ -77,10 +77,36 @@ public function it_provides_net_price_for_unit_with_taxes_excluded_of_price(): v
             ->willReturn(new ArrayCollection([$taxAdjustment]));
 
         $taxAdjustment->method('isNeutral')->willReturn(false);
-        $taxAdjustment->method('getAmount')->willReturn(200);
 
         $result = $this->provider->getUnitNetPrice($unit);
 
         self::assertSame(1000, $result);
     }
+
+    #[Test]
+    public function it_supports_multiple_neutral_tax_rates_by_summing_them(): void
+    {
+        $unit = $this->createMock(OrderItemUnitInterface::class);
+        $orderItem = $this->createMock(OrderItemInterface::class);
+        $taxAdj1 = $this->createMock(AdjustmentInterface::class);
+        $taxAdj2 = $this->createMock(AdjustmentInterface::class);
+
+        $unit->method('getOrderItem')->willReturn($orderItem);
+        $orderItem->method('getUnitPrice')->willReturn(1000);
+
+        $unit
+            ->method('getAdjustments')
+            ->with(AdjustmentInterface::TAX_ADJUSTMENT)
+            ->willReturn(new ArrayCollection([$taxAdj1, $taxAdj2]));
+
+        $taxAdj1->method('isNeutral')->willReturn(true);
+        $taxAdj1->method('getDetails')->willReturn(['taxRateAmount' => 0.05]);
+
+        $taxAdj2->method('isNeutral')->willReturn(true);
+        $taxAdj2->method('getDetails')->willReturn(['taxRateAmount' => 0.025]);
+
+        $result = $this->provider->getUnitNetPrice($unit);
+
+        self::assertSame(930, $result);
+    }
 }