add login for right file saving

Author: TamaroWalter

tests/discussion_test.php

@@ -91,6 +91,9 @@ public function test_create_discussion(): void {
         $prepost->formattachments = '';
         $prepost->modulecontext = $this->modulecontext;
 
+        // Log in as the teacher.
+        $this->setUser($this->teacher);
+
         // Build a new discussion object.
         $discussion = discussion::construct_without_id($this->course->id, $this->moodleoverflow->id, 'Discussion Topic',
                                            0, $this->teacher->id, $time, $time, $this->teacher->id);

tests/post_test.php

@@ -85,6 +85,10 @@ public function tearDown(): void {
      */
     public function test_create_post(): void {
         global $DB;
+
+        // Log in as the teacher.
+        $this->setUser($this->teacher);
+
         // Build a new post object.
         $time = time();
         $message = 'a unique message';
@@ -103,6 +107,9 @@ public function test_create_post(): void {
     public function test_edit_post(): void {
         global $DB;
 
+        // Log in as the teacher.
+        $this->setUser($this->teacher);
+
         // The post and the attachment should exist.
         $numberofattachments = count($DB->get_records('files', ['itemid' => $this->post->get_id()]));
         $this->assertEquals(2, $numberofattachments); // One Attachment is saved twice in 'files'.