From 0f8763429fc07dec6448c3d751be753dd601689d Mon Sep 17 00:00:00 2001
From: Oleksandr Savchenko <savchenko.oleksandr.ua@gmail.com>
Date: Tue, 8 May 2018 10:33:48 +0300
Subject: [PATCH] allow null in equals

---
 src/Enum.php       | 4 ++--
 tests/EnumTest.php | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Enum.php b/src/Enum.php
index 5f4a12a..f3aa212 100644
--- a/src/Enum.php
+++ b/src/Enum.php
@@ -80,9 +80,9 @@ public function __toString()
      *
      * @return bool True if Enums are equal, false if not equal
      */
-    final public function equals(Enum $enum)
+    final public function equals(Enum $enum = null)
     {
-        return $this->getValue() === $enum->getValue() && get_called_class() == get_class($enum);
+        return $enum !== null && $this->getValue() === $enum->getValue() && get_called_class() == get_class($enum);
     }
 
     /**
diff --git a/tests/EnumTest.php b/tests/EnumTest.php
index 4b28038..ffb6583 100644
--- a/tests/EnumTest.php
+++ b/tests/EnumTest.php
@@ -223,6 +223,7 @@ public function testEquals()
         $this->assertTrue($foo->equals($foo));
         $this->assertFalse($foo->equals($number));
         $this->assertTrue($foo->equals($anotherFoo));
+        $this->assertFalse($foo->equals(null));
     }
 
     /**