diff --git a/backup/util/helper/tests/backup_encode_content_test.php b/backup/util/helper/tests/backup_encode_content_test.php
index 26299d95be3..63554d32232 100644
--- a/backup/util/helper/tests/backup_encode_content_test.php
+++ b/backup/util/helper/tests/backup_encode_content_test.php
@@ -44,13 +44,33 @@ class backup_course_task_testcase extends basic_testcase {
      */
     public function test_course_encode_content_links() {
         global $CFG;
+        $httpsroot = "https://moodle.org";
+        $httproot = "http://moodle.org";
+        $oldroot = $CFG->wwwroot;
+
+        // HTTPS root and links of both types in content.
+        $CFG->wwwroot = $httpsroot;
         $encoded = backup_course_task::encode_content_links(
-                $CFG->wwwroot . '/course/view.php?id=123, ' .
-                $CFG->wwwroot . '/grade/index.php?id=123, ' .
-                $CFG->wwwroot . '/grade/report/index.php?id=123, ' .
-                $CFG->wwwroot . '/badges/view.php?type=2&id=123 and ' .
-                $CFG->wwwroot . '/user/index.php?id=123.');
-        $this->assertEquals('$@COURSEVIEWBYID*123@$, $@GRADEINDEXBYID*123@$, ' .
+                $httproot . '/course/view.php?id=123, ' .
+                $httpsroot . '/course/view.php?id=123, ' .
+                $httpsroot . '/grade/index.php?id=123, ' .
+                $httpsroot . '/grade/report/index.php?id=123, ' .
+                $httpsroot . '/badges/view.php?type=2&id=123 and ' .
+                $httpsroot . '/user/index.php?id=123.');
+        $this->assertEquals('$@COURSEVIEWBYID*123@$, $@COURSEVIEWBYID*123@$, $@GRADEINDEXBYID*123@$, ' .
                 '$@GRADEREPORTINDEXBYID*123@$, $@BADGESVIEWBYID*123@$ and $@USERINDEXVIEWBYID*123@$.', $encoded);
+
+        // HTTP root and links of both types in content.
+        $CFG->wwwroot = $httproot;
+        $encoded = backup_course_task::encode_content_links(
+            $httproot . '/course/view.php?id=123, ' .
+            $httpsroot . '/course/view.php?id=123, ' .
+            $httproot . '/grade/index.php?id=123, ' .
+            $httproot . '/grade/report/index.php?id=123, ' .
+            $httproot . '/badges/view.php?type=2&id=123 and ' .
+            $httproot . '/user/index.php?id=123.');
+        $this->assertEquals('$@COURSEVIEWBYID*123@$, $@COURSEVIEWBYID*123@$, $@GRADEINDEXBYID*123@$, ' .
+            '$@GRADEREPORTINDEXBYID*123@$, $@BADGESVIEWBYID*123@$ and $@USERINDEXVIEWBYID*123@$.', $encoded);
+        $CFG->wwwroot = $oldroot;
     }
 }