Merge pull request #11 from wmde/euro_string_casting

Add string casting / JSON serialization to Euro class

composer.json

@@ -4,7 +4,8 @@
 	"homepage": "https://github.com/wmde/Euro",
 	"license": "GPL-2.0-or-later",
 	"require": {
-		"php": ">=7.1"
+		"php": ">=7.1",
+		"ext-json": "*"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "~6.2",

src/Euro.php

@@ -10,7 +10,7 @@
  * @licence GNU GPL v2+
  * @author Jeroen De Dauw < jeroendedauw@gmail.com >
  */
-final class Euro {
+final class Euro implements \JsonSerializable {
 
 	private const DECIMAL_COUNT = 2;
 	private const CENTS_PER_EURO = 100;
@@ -29,6 +29,20 @@ private function __construct( int $cents ) {
 		$this->cents = $cents;
 	}
 
+	/**
+	 * @return string
+	 */
+	public function __toString(): string {
+		return $this->getEuroString();
+	}
+
+	/**
+	 * @return string
+	 */
+	public function jsonSerialize(): string {
+		return $this->getEuroString();
+	}
+
 	/**
 	 * @param int $cents
 	 * @return self

tests/Unit/EuroTest.php

@@ -91,6 +91,16 @@ public function testGiven1234Cents_getEuroStringReturns12euro34() {
 		$this->assertSame( '12.34', $amount->getEuroString() );
 	}
 
+	public function testGiven9876Cents_stringCastingReturns98euro76() {
+		$amount = Euro::newFromCents( 9876 );
+		$this->assertSame( '98.76', (string) $amount );
+	}
+
+	public function testGivenEuroAmount_jsonEncodeWillEncodeProperly() {
+		$amount = Euro::newFromCents( 9876 );
+		$this->assertSame( '"98.76"', json_encode( $amount ) );
+	}
+
 	public function testOneEuroString_getsTurnedInto100cents() {
 		$this->assertSame( 100, Euro::newFromString( '1.00' )->getEuroCents() );
 	}