diff --git a/SETUP/tests/ProjectUtils.inc b/SETUP/tests/ProjectUtils.inc
index 9fb2becc76..ce917f2998 100644
--- a/SETUP/tests/ProjectUtils.inc
+++ b/SETUP/tests/ProjectUtils.inc
@@ -110,19 +110,14 @@ class ProjectUtils extends PHPUnit\Framework\TestCase
 
     protected function add_page($project, $base)
     {
-        $source_project_dir = sys_get_temp_dir();
         $txt_file_name = "$base.txt";
-        $txt_file_path = "$source_project_dir/$txt_file_name";
-        $fp = fopen($txt_file_path, 'w');
-        fwrite($fp, $this->TEST_TEXT);
-        fclose($fp);
+        $txt_file_path = "$project->dir/$txt_file_name";
+        file_put_contents($txt_file_path, $this->TEST_TEXT);
 
         $image_file_name = "$base.png";
-        $img_file_path = "{$project->dir}/$image_file_name";
-        $fp = fopen($img_file_path, 'w');
+        $img_file_path = "$project->dir/$image_file_name";
         // write some data so file is not too short
-        fwrite($fp, str_repeat("This is a test image file", 10));
-        fclose($fp);
+        file_put_contents($img_file_path, str_repeat("This is a test image file", 10));
 
         project_add_page($project->projectid, $base, $image_file_name, $txt_file_path, $this->TEST_USERNAME_PM, time());
     }
diff --git a/SETUP/tests/phpunit_bootstrap.php b/SETUP/tests/phpunit_bootstrap.php
index 988bf3ab45..c2aecf98a6 100644
--- a/SETUP/tests/phpunit_bootstrap.php
+++ b/SETUP/tests/phpunit_bootstrap.php
@@ -1,5 +1,5 @@
 <?php
-global $relPath, $forum_type;
+global $relPath, $forum_type, $projects_dir, $aspell_temp_dir;
 $relPath = '../../pinc/';
 include_once($relPath.'base.inc');
 include_once($relPath.'misc.inc');
@@ -9,3 +9,6 @@
 
 include_once("phpunit_test_helpers.inc");
 include_once("ProjectUtils.inc");
+
+// Define top-level temporary directories
+$projects_dir = $aspell_temp_dir = "/tmp";