♻️ re arrange useful testing code for provider tests

lib/Providers/Qr/HandlesDataUri.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace RobThree\Auth\Providers\Qr;
+
+trait HandlesDataUri
+{
+	/**
+     * @param string $datauri
+     *
+     * @return null|array
+     */
+    private function DecodeDataUri($datauri)
+    {
+        if (preg_match('/data:(?P<mimetype>[\w\.\-\+\/]+);(?P<encoding>\w+),(?P<data>.*)/', $datauri, $m) === 1) {
+            return array(
+                'mimetype' => $m['mimetype'],
+                'encoding' => $m['encoding'],
+                'data' => base64_decode($m['data'])
+            );
+        }
+
+        return null;
+    }
+}

tests/Providers/Qr/IQRCodeProviderTest.php

@@ -5,26 +5,11 @@ namespace Tests\Providers\Qr;
 use PHPUnit\Framework\TestCase;
 use RobThree\Auth\TwoFactorAuth;
 use RobThree\Auth\TwoFactorAuthException;
+use RobThree\Auth\Providers\Qr\HandlesDataUri;
 
 class IQRCodeProviderTest extends TestCase
 {
-    /**
-     * @param string $datauri
-     *
-     * @return null|array
-     */
-    private function DecodeDataUri($datauri)
-    {
-        if (preg_match('/data:(?P<mimetype>[\w\.\-\/]+);(?P<encoding>\w+),(?P<data>.*)/', $datauri, $m) === 1) {
-            return array(
-                'mimetype' => $m['mimetype'],
-                'encoding' => $m['encoding'],
-                'data' => base64_decode($m['data'])
-            );
-        }
-
-        return null;
-    }
+    use HandlesDataUri;
 
     /**
      * @return void