Disallow serialization with Serializable interface (#11)

src/Enumeration/Enumeration.php

@@ -6,6 +6,7 @@
 use Dbalabka\Enumeration\Exception\EnumerationException;
 use Dbalabka\Enumeration\Exception\InvalidArgumentException;
 use Dbalabka\StaticConstructorLoader\StaticConstructorInterface;
+use Serializable;
 use function array_search;
 use function get_class_vars;
 use function sprintf;
@@ -18,7 +19,7 @@
  *
  * @author Dmitry Balabka <[email protected]>
  */
-abstract class Enumeration implements StaticConstructorInterface
+abstract class Enumeration implements StaticConstructorInterface, Serializable
 {
     const INITIAL_ORDINAL = 0;
 
@@ -158,6 +159,7 @@ final public function __clone()
 
     /**
      * Serialization is not allowed right now. It is not possible to properly serialize the singleton.
+     * See the documentation for workaround.
      */
     final public function __sleep()
     {
@@ -168,4 +170,24 @@ final public function __wakeup()
     {
         throw new EnumerationException('Enum unserialization is not allowed');
     }
+
+    final public function __serialize()
+    {
+        throw new EnumerationException('Enum serialization is not allowed');
+    }
+
+    final public function __unserialize()
+    {
+        throw new EnumerationException('Enum unserialization is not allowed');
+    }
+
+    final public function serialize()
+    {
+        throw new EnumerationException('Enum serialization is not allowed');
+    }
+
+    final public function unserialize($data)
+    {
+        throw new EnumerationException('Enum unserialization is not allowed');
+    }
 }

tests/Enumeration/EnumerationTest.php

@@ -11,6 +11,7 @@
 use Dbalabka\Enumeration\Tests\Fixtures\ActionWithPublicConstructor;
 use Dbalabka\Enumeration\Tests\Fixtures\Flag;
 use Error;
+use PHPUnit\Framework\Error\Warning;
 use PHPUnit\Framework\TestCase;
 use function serialize;
 use function version_compare;
@@ -96,7 +97,11 @@ public function testSerialization()
     public function testUnserialization()
     {
         Flag::initialize();
-        $this->expectException(EnumerationException::class);
+        if (version_compare(PHP_VERSION, '7.4.0-dev', '<')) {
+            $this->expectException(Warning::class);
+        } else {
+            $this->expectException(EnumerationException::class);
+        }
         unserialize('O:40:"Dbalabka\Enumeration\Tests\Fixtures\Flag":2:{s:51:" Dbalabka\Enumeration\Tests\Fixtures\Flag flagValue";i:2;s:10:" * ordinal";i:1;}');
     }