adds unit test for checking year on licence

Author: Michele Orselli

LICENSE.txt

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2016 SendGrid, Inc.
+Copyright (c) 2012-2017 SendGrid, Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

test/unit/LicenceYearTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace SendGrid\Test;
+
+class LicenceYearTest extends \PHPUnit_Framework_TestCase
+{
+    public function testConstructor()
+    {
+        $license = explode("\n", file_get_contents('./LICENSE.txt'));
+        $copyright = $license[2];
+
+        $year = date('Y');
+
+        $expected = "Copyright (c) 2012-{$year} SendGrid, Inc.";
+
+        $this->assertEquals($expected, $copyright);
+    }
+
+}