From 35f6de221293da503860bfa8e003d1d1031f8576 Mon Sep 17 00:00:00 2001
From: Mikael Dalholm <mikael@dalholm.se>
Date: Thu, 30 Dec 2021 14:36:24 +0100
Subject: [PATCH] Fixes #9

---
 src/Money.php                      |  4 ++--
 tests/Pest/CurrencyManagerTest.php | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/Money.php b/src/Money.php
index 94dff7b..efcec53 100644
--- a/src/Money.php
+++ b/src/Money.php
@@ -233,14 +233,14 @@ final class Money implements JsonSerializable, Arrayable, Wireable
     }
 
     /** Convert the money to a different currency. */
-    public function convertTo(Currency|string $currency): self
+    public function convertTo(Currency|string $currency, float $rate = null): self
     {
         // We're converting from the current currency to the default currency, and then to the intended currency
         $newCurrency = currency($currency);
         $mathDecimalDifference = $newCurrency->mathDecimals() - currencies()->getDefault()->mathDecimals();
 
         return new static(
-            (int) round($this->valueInDefaultCurrency() * $newCurrency->rate() * 10 ** $mathDecimalDifference, 0),
+            (int) round($this->valueInDefaultCurrency() * ($rate ?: $newCurrency->rate()) * 10 ** $mathDecimalDifference, 0),
             $currency
         );
     }
diff --git a/tests/Pest/CurrencyManagerTest.php b/tests/Pest/CurrencyManagerTest.php
index 0bfd835..b781d09 100644
--- a/tests/Pest/CurrencyManagerTest.php
+++ b/tests/Pest/CurrencyManagerTest.php
@@ -126,6 +126,16 @@ test('the default currency can have any rate', function () {
     )->toBe('0.54 €');
 });
 
+test('change currency rate on convertion', function () {
+    currencies()->add([new CZK(rate: 1), new EUR(rate: 0.5)]);
+
+    currencies()->setDefault(CZK::class);
+
+    expect(
+        money(200, 'CZK')->convertTo(EUR::class)->formatted()
+    )->toBe('1.00 €');
+});
+
 test('the getCode method accepts any currency format', function () {
     expect(currencies()->getCode(USD::class))->toBe('USD');
     expect(currencies()->getCode(new USD))->toBe('USD');