add test for phptimeconverter

tests/src/Converter/Time/PhpTimeConverterTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Ramsey\Uuid\Test\Converter;
+
+use Ramsey\Uuid\Converter\Time\PhpTimeConverter;
+
+class PhpTimeConverterTest extends \PHPUnit_Framework_TestCase
+{
+
+    public function testCalculateTimeReturnsArrayOfTimeSegments()
+    {
+        $seconds = 5;
+        $microSeconds = 3;
+        $calculatedTime = ($seconds * 10000000) + ($microSeconds * 10) + 0x01b21dd213814000;
+        $expectedArray = [
+            'low' => sprintf('%08x', $calculatedTime & 0xffffffff),
+            'mid' => sprintf('%04x', ($calculatedTime >> 32) & 0xffff),
+            'hi' => sprintf('%04x', ($calculatedTime >> 48) & 0x0fff)
+        ];
+
+        $converter = new PhpTimeConverter();
+        $returned = $converter->calculateTime($seconds, $microSeconds);
+        $this->assertEquals($expectedArray, $returned);
+    }
+}