MDL-86320 core: Fix unit test qrcode_test

lib/tests/qrcode_test.php

@@ -26,8 +26,8 @@ use core_qrcode;
  * @author     <[email protected]>
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
+#[\PHPUnit\Framework\Attributes\CoversClass(core_qrcode::class)]
 final class qrcode_test extends \basic_testcase {
-
     /**
      * Basic test to generate a QR code and check that the library is not broken.
      */
@@ -36,9 +36,9 @@ final class qrcode_test extends \basic_testcase {
         // binary file can be different. This is why tests are limited.
 
         $text = 'abc';
-        $color = 'black';
-        $qrcode = new core_qrcode($text, $color);
-        $svgdata = $qrcode->getBarcodeSVGcode(1, 1);
+        $color = 'green';
+        $qrcode = new core_qrcode($text);
+        $svgdata = $qrcode->getBarcodeSVGcode(1, 1, $color);
 
         // Just check the SVG was generated.
         $this->assertStringContainsString('<desc>' . $text . '</desc>', $svgdata);