Added another failing test case for GH Issue $131

tests/UuidFactoryTest.php

@@ -24,4 +24,15 @@ class UuidFactoryTest extends TestCase
 
         $this->assertEquals('ff6f8cb0-c57d-11e1-9b21-0800200c9a66', $uuid->toString());
     }
+
+    public function testFromStringParsesUuidInLowercase()
+    {
+        $uuidString = 'ff6f8cb0-c57d-11e1-9b21-0800200c9a66';
+        $uuidUpper = strtoupper($uuidString);
+        $factory = new UuidFactory(new FeatureSet(true));
+
+        $uuid = $factory->fromString($uuidUpper);
+
+        $this->assertEquals($uuidString, $uuid->toString());
+    }
 }