fix call static in SerializableTrait

Author: marc-mabe

src/EnumSerializableTrait.php

@@ -24,7 +24,7 @@ trait EnumSerializableTrait
 {
     /**
      * The method will be defined by MabeEnum\Enum
-     * @return null|bool|int|float|string
+     * @return null|bool|int|float|string|array
      */
     abstract public function getValue();
 
@@ -49,7 +49,7 @@ public function serialize(): string
     public function unserialize($serialized): void
     {
         $value     = \unserialize($serialized);
-        $constants = self::getConstants();
+        $constants = static::getConstants();
         $name      = \array_search($value, $constants, true);
         if ($name === false) {
             $message = \is_scalar($value)

tests/MabeEnumTest/EnumSerializableTraitTest.php

@@ -4,6 +4,7 @@
 
 use LogicException;
 use MabeEnum\Enum;
+use MabeEnumTest\TestAsset\ExtendedSerializableEnum;
 use MabeEnumTest\TestAsset\SerializableEnum;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
@@ -65,6 +66,18 @@ public function testUnserializeThrowsLogicExceptionOnChangingValue()
         $enum->unserialize(serialize(SerializableEnum::STR));
     }
 
+    public function testInheritence()
+    {
+        $enum = ExtendedSerializableEnum::EXTENDED();
+
+        $serialized = serialize($enum);
+        $this->assertInternalType('string', $serialized);
+
+        $unserialized = unserialize($serialized);
+        $this->assertInstanceOf(ExtendedSerializableEnum::class, $unserialized);
+        $this->assertSame($enum->getValue(), $unserialized->getValue());
+    }
+
     /**
      * Clears all instantiated enumerations and detected constants of the given enumerator
      * @param string $enumeration

tests/MabeEnumTest/TestAsset/ExtendedSerializableEnum.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace MabeEnumTest\TestAsset;
+
+/**
+ * Extended serializable enumeration
+ *
+ * @link http://github.com/marc-mabe/php-enum for the canonical source repository
+ * @copyright Copyright (c) 2017 Marc Bennewitz
+ * @license http://github.com/marc-mabe/php-enum/blob/master/LICENSE.txt New BSD License
+ */
+class ExtendedSerializableEnum extends SerializableEnum
+{
+    const EXTENDED = 'extended';
+}