diff --git a/grade/export/xml/grade_export_xml.php b/grade/export/xml/grade_export_xml.php
index aad24e49968..de1b97989d5 100644
--- a/grade/export/xml/grade_export_xml.php
+++ b/grade/export/xml/grade_export_xml.php
@@ -101,8 +101,13 @@ class grade_export_xml extends grade_export {
         $gui->close();
         $geub->close();
 
-        @header("Content-type: text/xml; charset=UTF-8");
-        send_temp_file($tempfilename, $downloadfilename, false);
+        if (defined('BEHAT_SITE_RUNNING')) {
+            // If behat is running, we cannot test the output if we force a file download.
+            include($tempfilename);
+        } else {
+            @header("Content-type: text/xml; charset=UTF-8");
+            send_temp_file($tempfilename, $downloadfilename, false);
+        }
     }
 }
 
diff --git a/lib/csvlib.class.php b/lib/csvlib.class.php
index b03f48a5320..c3e4d9df711 100644
--- a/lib/csvlib.class.php
+++ b/lib/csvlib.class.php
@@ -471,6 +471,11 @@ class csv_export_writer {
      */
     protected function send_header() {
         global $CFG;
+
+        if (defined('BEHAT_SITE_RUNNING')) {
+            // For text based formats - we cannot test the output with behat if we force a file download.
+            return;
+        }
         if (strpos($CFG->wwwroot, 'https://') === 0) { //https sites - watch out for IE! KB812935 and KB316431
             header('Cache-Control: max-age=10');
             header('Pragma: ');