diff --git a/lib/Database.php b/lib/Database.php
index 9bc44af..e69ef83 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -362,9 +362,15 @@ class Database {
         if (!$this->userExists($user)) {
             throw new User\Exception("doesNotExist", ["user" => $user, "action" => __FUNCTION__]);
         }
+        // check to make sure the parent exists, if one is specified
+        if(!is_null($parent)) {
+            if(!$this->db->prepare("SELECT count(*) from arsse_folders where owner is ? and id is ?", "str", "int")->run($user, $parent)->getValue()) {
+                throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "parent", 'id' => $parent]);
+            }
+        }
         // if we're not returning a recursive list we can use a simpler query
         if(!$recursive) {
-            return $this->db->preparre("SELECT id,name,parent from arsse_folders where owner is ? and parent is ?", "str", "int")->run($user, $parent);
+            return $this->db->prepare("SELECT id,name,parent from arsse_folders where owner is ? and parent is ?", "str", "int")->run($user, $parent);
         } else {
             return $this->db->prepare(
                 "WITH RECURSIVE folders(id) as (SELECT id from arsse_folders where owner is ? and parent is ? union select arsse_folders.id from arsse_folders join folders on arsse_folders.parent=folders.id) ".
diff --git a/lib/Db/Result.php b/lib/Db/Result.php
index ae7382c..dca03e0 100644
--- a/lib/Db/Result.php
+++ b/lib/Db/Result.php
@@ -10,7 +10,7 @@ interface Result extends \Iterator {
     function valid();
 
     function getRow();
-    function getAll();
+    function getAll(): array;
     function getValue();
     
     function changes();
diff --git a/lib/Db/SQLite3/Result.php b/lib/Db/SQLite3/Result.php
index 8cd90da..a5432d1 100644
--- a/lib/Db/SQLite3/Result.php
+++ b/lib/Db/SQLite3/Result.php
@@ -26,12 +26,11 @@ class Result implements \JKingWeb\Arsse\Db\Result {
         return ($this->valid() ? $this->cur : null);
     }
 
-    public function getAll() {
+    public function getAll(): array {
         $out = [];
         foreach($this as $row) {
             $out [] = $row;
         }
-        if(sizeof($out) < 1) return null;
         return $out;
     }
 
diff --git a/tests/lib/Database/SeriesFolder.php b/tests/lib/Database/SeriesFolder.php
index d7cea89..8e392fd 100644
--- a/tests/lib/Database/SeriesFolder.php
+++ b/tests/lib/Database/SeriesFolder.php
@@ -99,4 +99,58 @@ trait SeriesFolder {
         $this->assertException("notAuthorized", "User", "ExceptionAuthz");
         Data::$db->folderAdd("john.doe@example.com", ['name' => "Sociology"]);
     }
+
+    function testListRootFolders() {
+        $exp = [
+            ['id' => 5, 'name' => "Politics",   'parent' => null],
+            ['id' => 1, 'name' => "Technology", 'parent' => null],
+        ];
+        $this->assertSame($exp, Data::$db->folderList("john.doe@example.com", null, false)->getAll());
+        $exp = [
+            ['id' => 4, 'name' => "Politics",   'parent' => null],
+        ];
+        $this->assertSame($exp, Data::$db->folderList("jane.doe@example.com", null, false)->getAll());
+        $exp = [];
+        $this->assertSame($exp, Data::$db->folderList("admin@example.net", null, false)->getAll());
+    }
+
+    function testListFoldersRecursively() {
+        $exp = [
+            ['id' => 5, 'name' => "Politics",   'parent' => null],
+            ['id' => 6, 'name' => "Politics",   'parent' => 2],
+            ['id' => 3, 'name' => "Rocketry",   'parent' => 1],
+            ['id' => 2, 'name' => "Software",   'parent' => 1],
+            ['id' => 1, 'name' => "Technology", 'parent' => null],
+        ];
+        $this->assertSame($exp, Data::$db->folderList("john.doe@example.com", null, true)->getAll());
+        $exp = [
+            ['id' => 6, 'name' => "Politics",   'parent' => 2],
+            ['id' => 3, 'name' => "Rocketry",   'parent' => 1],
+            ['id' => 2, 'name' => "Software",   'parent' => 1],
+        ];
+        $this->assertSame($exp, Data::$db->folderList("john.doe@example.com", 1, true)->getAll());
+        $exp = [];
+        $this->assertSame($exp, Data::$db->folderList("jane.doe@example.com", 4, true)->getAll());
+    }
+
+    function testListFoldersOfAMissingParent() {
+        $this->assertException("idMissing", "Db", "ExceptionInput");
+        Data::$db->folderList("john.doe@example.com", 2112);
+    }
+
+    function testListFoldersOfTheWrongOwner() {
+        $this->assertException("idMissing", "Db", "ExceptionInput");
+        Data::$db->folderList("john.doe@example.com", 4); // folder ID 4 belongs to Jane
+    }
+
+    function testListFoldersForAMissingUser() {
+        $this->assertException("doesNotExist", "User");
+        Data::$db->folderList("john.doe@example.org");
+    }
+
+    function testListFoldersWithoutAuthority() {
+        Phake::when(Data::$user)->authorize->thenReturn(false);
+        $this->assertException("notAuthorized", "User", "ExceptionAuthz");
+        Data::$db->folderList("john.doe@example.com");
+    }
 }
\ No newline at end of file