Add Uuid

Author: danitome24

composer.json

@@ -20,7 +20,8 @@
     }
   },
   "require": {
-    "php": ">=7"
+    "php": ">=7",
+    "ramsey/uuid": "^3.7"
   },
   "require-dev": {
     "phpunit/phpunit": "^6.2",

src/PhpValueObject/Identifier/Uuid.php

@@ -0,0 +1,42 @@
+<?php
+/**
+ * This software was built by:
+ * Daniel Tomé Fernández <[email protected]>
+ * GitHub: danitome24
+ */
+
+namespace PhpValueObject\Identifier;
+
+final class Uuid
+{
+    /**
+     * @var string
+     */
+    private $id;
+
+    /**
+     * Uuid constructor.
+     */
+    private function __construct()
+    {
+        $this->id = \Ramsey\Uuid\Uuid::uuid4()->toString();
+    }
+
+    /**
+     * Generate Uuid identifier
+     *
+     * @return static
+     */
+    public static function generate()
+    {
+        return new static();
+    }
+
+    /**
+     * @return string
+     */
+    public function id(): string
+    {
+        return $this->id;
+    }
+}

tests/Identifier/UuidTest.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * This software was built by:
+ * Daniel Tomé Fernández <[email protected]>
+ * GitHub: danitome24
+ */
+
+namespace Test\Identifier;
+
+use PHPUnit\Framework\TestCase;
+use PhpValueObject\Identifier\Uuid;
+
+class UuidTest extends TestCase
+{
+    public function testUuidIsDifferentEachTime()
+    {
+        $this->assertNotEquals(Uuid::generate(), Uuid::generate());
+        $this->assertNotEquals(Uuid::generate()->id(), Uuid::generate()->id());
+    }
+
+}