feature(currency): allow enums to be passed as currency

src/CurrenciesTrait.php

@@ -34,6 +34,14 @@
             return new Currency($currency);
         }
 
+        if ($currency instanceof \StringBackedEnum) {
+            return new Currency($currency->value);
+        }
+
+        if ($currency instanceof \UnitEnum) {
+            return new Currency($currency->name);
+        }
+
         return $currency;
     }
 

tests/Enums/CurrencyIntBacked.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Cknow\Money\Tests\Enums;
+
+enum CurrencyIntBacked: int
+{
+    case USD = 1;
+}

tests/Enums/CurrencyNotBacked.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Cknow\Money\Tests\Enums;
+
+enum CurrencyNotBacked
+{
+    case USD;
+}

tests/Enums/CurrencyStringBacked.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Cknow\Money\Tests\Enums;
+
+enum CurrencyStringBacked: string
+{
+    case USD = 'USD';
+}

tests/MoneyParserTraitTest.php

@@ -3,6 +3,9 @@
 namespace Cknow\Money\Tests;
 
 use Cknow\Money\Money;
+use Cknow\Money\Tests\Enums\CurrencyIntBacked;
+use Cknow\Money\Tests\Enums\CurrencyNotBacked;
+use Cknow\Money\Tests\Enums\CurrencyStringBacked;
 use InvalidArgumentException;
 use Money\Currency;
 use Money\Exception\ParserException;
@@ -101,6 +104,14 @@ public function test_parse_invalid_money_value()
         Money::parse(new stdClass);
     }
 
+    public function test_parse_currency()
+    {
+        static::assertEquals(Money::parseCurrency('USD'), new Currency('USD'));
+        static::assertEquals(Money::parseCurrency(CurrencyStringBacked::USD), new Currency('USD'));
+        static::assertEquals(Money::parseCurrency(CurrencyIntBacked::USD), new Currency('USD'));
+        static::assertEquals(Money::parseCurrency(CurrencyNotBacked::USD), new Currency('USD'));
+    }
+
     public function test_parse_invalid_money()
     {
         $this->expectException(ParserException::class);