Implement JsonSerializable, fixes #67

.travis.yml

@@ -1,12 +1,12 @@
 language: php
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
   - nightly
   - hhvm
 

composer.json

@@ -22,7 +22,7 @@
         }
     },
     "require": {
-        "php": ">=5.3"
+        "php": ">=5.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.35|^5.7|^6.0",

src/Enum.php

@@ -15,7 +15,7 @@
  * @author Daniel Costa <[email protected]>
  * @author Mirosław Filip <[email protected]>
  */
-abstract class Enum
+abstract class Enum implements \JsonSerializable
 {
     /**
      * Enum value
@@ -183,4 +183,16 @@ public static function __callStatic($name, $arguments)
 
         throw new \BadMethodCallException("No static method or enum constant '$name' in class " . get_called_class());
     }
+
+    /**
+     * Specify data which should be serialized to JSON. This method returns data that can be serialized by json_encode()
+     * natively.
+     *
+     * @return mixed
+     * @link http://php.net/manual/en/jsonserializable.jsonserialize.php
+     */
+    public function jsonSerialize()
+    {
+        return $this->getValue();
+    }
 }

tests/EnumTest.php

@@ -40,7 +40,7 @@ public function testGetKey()
 
     /**
      * @dataProvider invalidValueProvider
-     * @expectedException UnexpectedValueException
+     * @expectedException \UnexpectedValueException
      * @expectedExceptionMessage is not part of the enum MyCLabs\Tests\Enum\EnumFixture
      */
     public function testCreatingEnumWithInvalidValue($value)
@@ -247,4 +247,18 @@ public function testEqualsConflictValues()
     {
         $this->assertFalse(EnumFixture::FOO()->equals(EnumConflict::FOO()));
     }
+
+    /**
+     * jsonSerialize()
+     */
+    public function testJsonSerialize()
+    {
+        $this->assertJsonStringEqualsJsonString('"foo"', json_encode(new EnumFixture(EnumFixture::FOO)));
+        $this->assertJsonStringEqualsJsonString('"bar"', json_encode(new EnumFixture(EnumFixture::BAR)));
+        $this->assertJsonStringEqualsJsonString('42',    json_encode(new EnumFixture(EnumFixture::NUMBER)));
+        $this->assertJsonStringEqualsJsonString('0',     json_encode(new EnumFixture(EnumFixture::PROBLEMATIC_NUMBER)));
+        $this->assertJsonStringEqualsJsonString('null',  json_encode(new EnumFixture(EnumFixture::PROBLEMATIC_NULL)));
+        $this->assertJsonStringEqualsJsonString('""',    json_encode(new EnumFixture(EnumFixture::PROBLEMATIC_EMPTY_STRING)));
+        $this->assertJsonStringEqualsJsonString('false', json_encode(new EnumFixture(EnumFixture::PROBLEMATIC_BOOLEAN_FALSE)));
+    }
 }