diff --git a/lib/AbstractException.php b/lib/AbstractException.php
index 433d5f4..b8fa079 100644
--- a/lib/AbstractException.php
+++ b/lib/AbstractException.php
@@ -43,6 +43,7 @@ abstract class AbstractException extends \Exception {
         "Db/ExceptionInput.constraintViolation" => 10236,
         "Db/ExceptionInput.typeViolation"       => 10237,
         "Db/ExceptionInput.circularDependence"  => 10238,
+        "Db/ExceptionInput.subjectMissing"      => 10239,
         "Db/ExceptionTimeout.general"           => 10241,
         "Conf/Exception.fileMissing"            => 10301,
         "Conf/Exception.fileUnusable"           => 10302,
diff --git a/lib/Database.php b/lib/Database.php
index 17e8ad7..16fe21a 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -344,25 +344,23 @@ class Database {
     public function folderRemove(string $user, int $id): bool {
         if(!Data::$user->authorize($user, __FUNCTION__)) throw new User\ExceptionAuthz("notAuthorized", ["action" => __FUNCTION__, "user" => $user]);
         $changes = $this->db->prepare("DELETE FROM arsse_folders where owner is ? and id is ?", "str", "int")->run($user, $id)->changes();
-        if(!$changes) throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
+        if(!$changes) throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
         return true;
     }
 
     public function folderPropertiesGet(string $user, int $id): array {
         if(!Data::$user->authorize($user, __FUNCTION__)) throw new User\ExceptionAuthz("notAuthorized", ["action" => __FUNCTION__, "user" => $user]);
         $props = $this->db->prepare("SELECT id,name,parent from arsse_folders where owner is ? and id is ?", "str", "int")->run($user, $id)->getRow();
-        if(!$props) throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
+        if(!$props) throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
         return $props;
     }
 
     public function folderPropertiesSet(string $user, int $id, array $data): bool {
         if(!Data::$user->authorize($user, __FUNCTION__)) throw new User\ExceptionAuthz("notAuthorized", ["action" => __FUNCTION__, "user" => $user]);
         // validate the folder ID and, if specified, the parent to move it to
-        if(array_key_exists("parent", $data)) {
-            $f = $this->folderValidateId($user, $id, $data['parent']);
-        } else {
-            $f = $this->folderValidateId($user, $id);
-        }
+        $parent = null;
+        if(array_key_exists("parent", $data)) $parent = $data['parent'];
+        $f = $this->folderValidateId($user, $id, $parent, true);
         // if a new name is specified, validate it
         if(array_key_exists("name", $data)) {
             $this->folderValidateName($data['name']);
@@ -381,7 +379,7 @@ class Database {
         return (bool) $this->db->prepare("UPDATE arsse_folders set $setClause where owner is ? and id is ?", $setTypes, "str", "int")->run($setValues, $user, $id)->changes();
     }
 
-    protected function folderValidateId(string $user, int $id = null, int $parent = null): array {
+    protected function folderValidateId(string $user, int $id = null, int $parent = null, bool $subject = false): array {
         if(is_null($id)) {
             // if no ID is specified this is a no-op, unless a parent is specified, which is always a circular dependence
             if(!is_null($parent)) {
@@ -391,7 +389,7 @@ class Database {
         }
         // check whether the folder exists and is owned by the user
         $f = $this->db->prepare("SELECT name,parent from arsse_folders where owner is ? and id is ?", "str", "int")->run($user, $id)->getRow();
-        if(!$f) throw new Db\ExceptionInput("idMissing", ["action" => $this->caller(), "field" => "folder", 'id' => $parent]);
+        if(!$f) throw new Db\ExceptionInput($subject ? "subjectMissing" : "idMissing", ["action" => $this->caller(), "field" => "folder", 'id' => $parent]);
         // if we're moving a folder to a new parent, check that the parent is valid
         if(!is_null($parent)) {
             // make sure both that the parent exists, and that the parent is not either the folder itself or one of its children (a circular dependence)
@@ -413,7 +411,7 @@ class Database {
 
     protected function folderValidateName($name): bool {
         $name = (string) $name;
-        if($name=="") {
+        if(!strlen($name)) {
             throw new Db\ExceptionInput("missing", ["action" => $this->caller(), "field" => "name"]);
         } else if(!strlen(trim($name))) {
             throw new Db\ExceptionInput("whitespace", ["action" => $this->caller(), "field" => "name"]);
@@ -473,7 +471,7 @@ class Database {
     public function subscriptionRemove(string $user, int $id): bool {
         if(!Data::$user->authorize($user, __FUNCTION__)) throw new User\ExceptionAuthz("notAuthorized", ["action" => __FUNCTION__, "user" => $user]);
         $changes = $this->db->prepare("DELETE from arsse_subscriptions where owner is ? and id is ?", "str", "int")->run($user, $id)->changes();
-        if(!$changes) throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
+        if(!$changes) throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
         return true;
     }
 
@@ -483,7 +481,7 @@ class Database {
         Data::$user->authorizationEnabled(false);
         $sub = $this->subscriptionList($user, null, $id)->getRow();
         Data::$user->authorizationEnabled(true);
-        if(!$sub) throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $id]);
+        if(!$sub) throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $id]);
         return $sub;
     }
 
@@ -492,18 +490,20 @@ class Database {
         $tr = $this->db->begin();
         if(!$this->db->prepare("SELECT count(*) from arsse_subscriptions where owner is ? and id is ?", "str", "int")->run($user, $id)->getValue()) {
             // if the ID doesn't exist or doesn't belong to the user, throw an exception
-            throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $id]);
+            throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $id]);
         }
         if(array_key_exists("folder", $data)) {
             // ensure the target folder exists and belong to the user
             $this->folderValidateId($user, $data['folder']);
         }
         if(array_key_exists("title", $data)) {
-            // if the title is effectively an empty string, change it to null so that the feed title is used instead
-            $title = (string) $data['title'];
-            $title = trim($title);
-            if($title==="") $title = null;
-            $data['title'] = $title;
+            // if the title is null, this signals intended use of the default title; otherwise make sure it's not effectively an empty string
+            if(!is_null($data['title'])) {
+                $title = (string) $data['title'];
+                if(!strlen($title)) throw new Db\ExceptionInput("missing", ["action" => __FUNCTION__, "field" => "title"]);
+                if(!strlen(trim($title))) throw new Db\ExceptionInput("whitespace", ["action" => __FUNCTION__, "field" => "title"]);
+                $data['title'] = $title;
+            }
         }
         $valid = [
             'title'      => "str",
@@ -558,7 +558,7 @@ class Database {
         $tr = $this->db->begin();
         // check to make sure the feed exists
         $f = $this->db->prepare('SELECT url, username, password, DATEFORMAT("http", modified) AS lastmodified, etag, err_count FROM arsse_feeds where id is ?', "int")->run($feedID)->getRow();
-        if(!$f) throw new Db\ExceptionInput("idMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $feedID]);
+        if(!$f) throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "feed", 'id' => $feedID]);
         // the Feed object throws an exception when there are problems, but that isn't ideal
         // here. When an exception is thrown it should update the database with the
         // error instead of failing; if other exceptions are thrown, we should simply roll back
diff --git a/lib/REST/NextCloudNews/V1_2.php b/lib/REST/NextCloudNews/V1_2.php
index 59bdd0b..9061e5a 100644
--- a/lib/REST/NextCloudNews/V1_2.php
+++ b/lib/REST/NextCloudNews/V1_2.php
@@ -159,7 +159,7 @@ class V1_2 extends \JKingWeb\Arsse\REST\AbstractHandler {
         } catch(ExceptionInput $e) {
             switch($e->getCode()) {
                 // folder does not exist
-                case 10235: return new Response(404);
+                case 10239: return new Response(404);
                 // folder already exists
                 case 10236: return new Response(409);
                 // folder name not acceptable
@@ -206,13 +206,12 @@ class V1_2 extends \JKingWeb\Arsse\REST\AbstractHandler {
         }
         $out = ['feeds' => $out];
         $out['starredCount'] = Data::$db->articleStarredCount(Data::$user->id);
-        $newest = Data::$db->editionLatest(Data::$user->id, ['subscription' => $id]);
+        $newest = Data::$db->editionLatest(Data::$user->id);
         if($newest) $out['newestItemId'] = $newest;
         return new Response(200, $out);
     }
     
     // return list of feeds which should be refreshed
-    // refresh a feed
     protected function feedListStale(array $url, array $data): Response {
         // function requires admin rights per spec
         if(Data::$user->rightsGet(Data::$user->id)==User::RIGHTS_NONE) return new Response(403);
@@ -305,7 +304,15 @@ class V1_2 extends \JKingWeb\Arsse\REST\AbstractHandler {
         try {
             Data::$db->subscriptionPropertiesSet(Data::$user->id, (int) $url[1], $in);
         } catch(ExceptionInput $e) {
-            return new Response(404);
+            switch($e->getCode()) {
+                // subscription does not exist
+                case 10239: return new Response(404);
+                // name is invalid
+                case 10231:
+                case 10232: return new Response(422);
+                // other errors related to input
+                default: return new Response(400);
+            }
         }
         return new Response(204);
     }
@@ -326,7 +333,14 @@ class V1_2 extends \JKingWeb\Arsse\REST\AbstractHandler {
         try {
             Data::$db->subscriptionPropertiesSet(Data::$user->id, (int) $url[1], $in);
         } catch(ExceptionInput $e) {
-            return new Response(404);
+            switch($e->getCode()) {
+                // subscription does not exist
+                case 10239: return new Response(404);
+                // folder does not exist
+                case 10235: return new Response(422);
+                // other errors related to input
+                default: return new Response(400);
+            }
         }
         return new Response(204);
     }
diff --git a/locale/en.php b/locale/en.php
index 97d8c78..137af98 100644
--- a/locale/en.php
+++ b/locale/en.php
@@ -66,6 +66,7 @@ return [
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.whitespace'          => 'Required field "{field}" of action "{action}" may not contain only whitespace',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.tooLong'             => 'Required field "{field}" of action "{action}" has a maximum length of {max}',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.tooShort'            => 'Required field "{field}" of action "{action}" has a minimum length of {min}',
+    'Exception.JKingWeb/Arsse/Db/ExceptionInput.subjectMissing'      => 'Referenced ID ({id}) in field "{field}" does not exist',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.idMissing'           => 'Referenced ID ({id}) in field "{field}" does not exist',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.circularDependence'  => 'Referenced ID ({id}) in field "{field}" creates a circular dependence',
     'Exception.JKingWeb/Arsse/Db/ExceptionInput.constraintViolation' => '{0}',
diff --git a/tests/REST/NextCloudNews/TestNCNV1_2.php b/tests/REST/NextCloudNews/TestNCNV1_2.php
index c88c273..d5f6782 100644
--- a/tests/REST/NextCloudNews/TestNCNV1_2.php
+++ b/tests/REST/NextCloudNews/TestNCNV1_2.php
@@ -11,6 +11,68 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
     use Test\Tools;
 
     protected $h;
+    protected $feeds = [ // expected sample output of a feed list from the database, and the resultant expected transformation by the REST handler
+        'db' => [
+            [
+                'id' => 2112,
+                'url' => 'http://example.com/news.atom',
+                'favicon' => 'http://example.com/favicon.png',
+                'source' => 'http://example.com/',
+                'folder' => NULL,
+                'pinned' => 0,
+                'err_count' => 0,
+                'err_msg' => '',
+                'order_type' => 0,
+                'added' => 1495287354,
+                'title' => 'First example feed',
+                'unread' => 50048,
+            ],
+            [
+                'id' => 42,
+                'url' => 'http://example.org/news.atom',
+                'favicon' => 'http://example.org/favicon.png',
+                'source' => 'http://example.org/',
+                'folder' => 8,
+                'pinned' => 1,
+                'err_count' => 0,
+                'err_msg' => '',
+                'order_type' => 2,
+                'added' => 1495287354,
+                'title' => 'Second example feed',
+                'unread' => 23,
+            ],
+        ],
+        'rest' => [
+            [
+                'id' => 2112,
+                'url' => 'http://example.com/news.atom',
+                'faviconLink' => 'http://example.com/favicon.png',
+                'link' => 'http://example.com/',
+                'folderId' => 0,
+                'pinned' => false,
+                'updateErrorCount' => 0,
+                'lastUpdateError' => '',
+                'ordering' => 0,
+                'added' => 1495287354,
+                'title' => 'First example feed',
+                'unreadCount' => 50048,
+            ],
+            [
+                'id' => 42,
+                'url' => 'http://example.org/news.atom',
+                'faviconLink' => 'http://example.org/favicon.png',
+                'link' => 'http://example.org/',
+                'folderId' => 8,
+                'pinned' => true,
+                'updateErrorCount' => 0,
+                'lastUpdateError' => '',
+                'ordering' => 2,
+                'added' => 1495287354,
+                'title' => 'Second example feed',
+                'unreadCount' => 23,
+            ],
+        ],
+    ];
 
     function setUp() {
         $this->clearData();
@@ -78,7 +140,9 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
             ['id' => 1,  'name' => "Software", 'parent' => null],
             ['id' => 12, 'name' => "Hardware", 'parent' => null],
         ];
-        Phake::when(Data::$db)->folderList(Data::$user->id, null, false)->thenReturn(new Result($list));
+        Phake::when(Data::$db)->folderList(Data::$user->id, null, false)->thenReturn(new Result([]))->thenReturn(new Result($list));
+        $exp = new Response(200, ['folders' => []]);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/folders")));
         $exp = new Response(200, ['folders' => $list]);
         $this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/folders")));
     }
@@ -123,7 +187,7 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
     }
 
     function testRemoveAFolder() {
-        Phake::when(Data::$db)->folderRemove(Data::$user->id, 1)->thenReturn(true)->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("idMissing"));
+        Phake::when(Data::$db)->folderRemove(Data::$user->id, 1)->thenReturn(true)->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("subjectMissing"));
         $exp = new Response(204);
         $this->assertEquals($exp, $this->h->dispatch(new Request("DELETE", "/folders/1")));
         // fail on the second invocation because it no longer exists
@@ -145,7 +209,7 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
         Phake::when(Data::$db)->folderPropertiesSet(Data::$user->id, 1, $in[2])->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("missing"));
         Phake::when(Data::$db)->folderPropertiesSet(Data::$user->id, 1, $in[3])->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("whitespace"));
         Phake::when(Data::$db)->folderPropertiesSet(Data::$user->id, 1, $in[4])->thenReturn(true); // this should be stopped by the handler before the request gets to the database
-        Phake::when(Data::$db)->folderPropertiesSet(Data::$user->id, 3, $this->anything())->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("idMissing")); // folder ID 3 does not exist
+        Phake::when(Data::$db)->folderPropertiesSet(Data::$user->id, 3, $this->anything())->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("subjectMissing")); // folder ID 3 does not exist
         $exp = new Response(204);
         $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/folders/1", json_encode($in[0]), 'application/json')));
         $exp = new Response(409);
@@ -164,4 +228,122 @@ class TestNCNV1_2 extends \PHPUnit\Framework\TestCase {
         $exp = new Response(200, ['version' => \JKingWeb\Arsse\VERSION]);
         $this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/version")));
     }
+
+    function testListSubscriptions() {
+        $exp1 = [
+            'feeds' => [],
+            'starredCount' => 0,
+        ];
+        $exp2 = [
+            'feeds'        => $this->feeds['rest'],
+            'starredCount' => 5,
+            'newestItemId' => 4758915,
+        ];
+        Phake::when(Data::$db)->subscriptionList(Data::$user->id)->thenReturn(new Result([]))->thenReturn(new Result($this->feeds['db']));
+        Phake::when(Data::$db)->articleStarredCount(Data::$user->id)->thenReturn(0)->thenReturn(5);
+        Phake::when(Data::$db)->editionLatest(Data::$user->id)->thenReturn(0)->thenReturn(4758915);
+        $exp = new Response(200, $exp1);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/feeds")));
+        $exp = new Response(200, $exp2);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("GET", "/feeds")));
+        // make sure the correct date format is actually requested
+        Phake::verify(Data::$db, Phake::atLeast(1))->dateFormatDefault("unix");
+    }
+
+    function testAddASubscription() {
+        $in = [
+            ['url' => "http://example.com/news.atom", 'folderId' => 3],
+            ['url' => "http://example.org/news.atom", 'folderId' => 8],
+            ['url' => "http://example.net/news.atom", 'folderId' => 0],
+        ];
+        $out = [
+            ['feeds' => [$this->feeds['rest'][0]]],
+            ['feeds' => [$this->feeds['rest'][1]], 'newestItemId' => 4758915],
+            [],
+        ];
+        // set up the necessary mocks
+        Phake::when(Data::$db)->subscriptionAdd(Data::$user->id, "http://example.com/news.atom")->thenReturn(2112)->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("constraintViolation")); // error on the second call
+        Phake::when(Data::$db)->subscriptionAdd(Data::$user->id, "http://example.org/news.atom")->thenReturn( 42 )->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("constraintViolation")); // error on the second call
+        Phake::when(Data::$db)->subscriptionPropertiesGet(Data::$user->id, 2112)->thenReturn($this->feeds['db'][0]);
+        Phake::when(Data::$db)->subscriptionPropertiesGet(Data::$user->id,   42)->thenReturn($this->feeds['db'][1]);
+        Phake::when(Data::$db)->editionLatest(Data::$user->id, ['subscription' => 2112])->thenReturn(0);
+        Phake::when(Data::$db)->editionLatest(Data::$user->id, ['subscription' =>   42])->thenReturn(4758915);
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 2112, ['folder' => 3])->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("idMissing")); // folder ID 3 does not exist
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id,   42, ['folder' => 8])->thenReturn(true);
+        // set up a mock for a bad feed
+        Phake::when(Data::$db)->subscriptionAdd(Data::$user->id, "http://example.net/news.atom")->thenThrow(new \JKingWeb\Arsse\Feed\Exception("http://example.net/news.atom", new \PicoFeed\Client\InvalidUrlException()));
+        // add the subscriptions
+        $exp = new Response(200, $out[0]);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("POST", "/feeds", json_encode($in[0]), 'application/json')));
+        $exp = new Response(200, $out[1]);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("POST", "/feeds", json_encode($in[1]), 'application/json')));
+        // try to add them a second time
+        $exp = new Response(409);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("POST", "/feeds", json_encode($in[0]), 'application/json')));
+        $exp = new Response(409);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("POST", "/feeds", json_encode($in[1]), 'application/json')));
+        // try to add a bad feed
+        $exp = new Response(422);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("POST", "/feeds", json_encode($in[2]), 'application/json')));
+        // make sure the correct date format is actually requested
+        Phake::verify(Data::$db, Phake::atLeast(1))->dateFormatDefault("unix");
+    }
+
+    function testRemoveASubscription() {
+        Phake::when(Data::$db)->subscriptionRemove(Data::$user->id, 1)->thenReturn(true)->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("subjectMissing"));
+        $exp = new Response(204);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("DELETE", "/feeds/1")));
+        // fail on the second invocation because it no longer exists
+        $exp = new Response(404);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("DELETE", "/feeds/1")));
+        Phake::verify(Data::$db, Phake::times(2))->subscriptionRemove(Data::$user->id, 1);
+    }
+
+    function testMoveASubscription() {
+        $in = [
+            ['folderId' =>    0],
+            ['folderId' =>   42],
+            ['folderId' => 2112],
+            ['folderId' =>   42],
+        ];
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, ['folder' => 42])->thenReturn(true);
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, ['folder' => null])->thenReturn(true);
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, ['folder' => 2112])->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("idMissing")); // folder does not exist
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 42, $this->anything())->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("subjectMissing")); // subscription does not exist
+        $exp = new Response(204);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/move", json_encode($in[0]), 'application/json')));
+        $exp = new Response(204);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/move", json_encode($in[1]), 'application/json')));
+        $exp = new Response(422);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/move", json_encode($in[2]), 'application/json')));
+        $exp = new Response(404);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/42/move", json_encode($in[3]), 'application/json')));
+    }
+
+    function testRenameASubscription() {
+        $in = [
+            ['feedTitle' => null],
+            ['feedTitle' => "Ook"],
+            ['feedTitle' => "   "],
+            ['feedTitle' => ""],
+            ['feedTitle' => false],
+            ['feedTitle' => "Feed does not exist"],
+        ];
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, $this->identicalTo(['title' =>  null]))->thenReturn(true);
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, $this->identicalTo(['title' => "Ook"]))->thenReturn(true);
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, $this->identicalTo(['title' => "   "]))->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("whitespace"));
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, $this->identicalTo(['title' =>    ""]))->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("missing"));
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 1, $this->identicalTo(['title' => false]))->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("missing"));
+        Phake::when(Data::$db)->subscriptionPropertiesSet(Data::$user->id, 42, $this->anything())->thenThrow(new \JKingWeb\Arsse\Db\ExceptionInput("subjectMissing"));
+        $exp = new Response(204);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/rename", json_encode($in[0]), 'application/json')));
+        $exp = new Response(204);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/rename", json_encode($in[1]), 'application/json')));
+        $exp = new Response(422);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/rename", json_encode($in[2]), 'application/json')));
+        $exp = new Response(422);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/1/rename", json_encode($in[3]), 'application/json')));
+        $exp = new Response(404);
+        $this->assertEquals($exp, $this->h->dispatch(new Request("PUT", "/feeds/42/rename", json_encode($in[4]), 'application/json')));
+    }
 }
\ No newline at end of file
diff --git a/tests/lib/Database/SeriesFolder.php b/tests/lib/Database/SeriesFolder.php
index 2042c49..9311071 100644
--- a/tests/lib/Database/SeriesFolder.php
+++ b/tests/lib/Database/SeriesFolder.php
@@ -139,12 +139,12 @@ trait SeriesFolder {
     }
 
     function testRemoveAMissingFolder() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderRemove("john.doe@example.com", 2112);
     }
 
     function testRemoveAFolderOfTheWrongOwner() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderRemove("john.doe@example.com", 4); // folder ID 4 belongs to Jane
     }
 
@@ -165,12 +165,12 @@ trait SeriesFolder {
     }
 
     function testGetThePropertiesOfAMissingFolder() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderPropertiesGet("john.doe@example.com", 2112);
     }
 
     function testGetThePropertiesOfAFolderOfTheWrongOwner() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderPropertiesGet("john.doe@example.com", 4); // folder ID 4 belongs to Jane
     }
 
@@ -217,12 +217,12 @@ trait SeriesFolder {
     }
 
     function testSetThePropertiesOfAMissingFolder() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderPropertiesSet("john.doe@example.com", 2112, ['parent' => null]);
     }
 
-    function testSetThePropertiesOfAFolderOfTheWrongOwner() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+    function testSetThePropertiesOfAFolderForTheWrongOwner() {
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->folderPropertiesSet("john.doe@example.com", 4, ['parent' => null]); // folder ID 4 belongs to Jane
     }
 
diff --git a/tests/lib/Database/SeriesSubscription.php b/tests/lib/Database/SeriesSubscription.php
index 0b72547..691ef9e 100644
--- a/tests/lib/Database/SeriesSubscription.php
+++ b/tests/lib/Database/SeriesSubscription.php
@@ -167,13 +167,13 @@ trait SeriesSubscription {
     }
 
     function testRemoveAMissingSubscription() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->subscriptionRemove($this->user, 2112);
     }
 
     function testRemoveASubscriptionForTheWrongOwner() {
         $this->user = "jane.doe@example.com";
-        $this->assertException("idMissing", "Db", "ExceptionInput");
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
         Data::$db->subscriptionRemove($this->user, 1);
     }
 
@@ -257,31 +257,44 @@ trait SeriesSubscription {
         $state['arsse_subscriptions']['rows'][0] = [1,"john.doe@example.com",2,"Ook Ook",3,0,0];
         $this->compareExpectations($state);
         Data::$db->subscriptionPropertiesSet($this->user, 1,[
-            'title' => "          ",
+            'title' => null,
         ]);
         $state['arsse_subscriptions']['rows'][0] = [1,"john.doe@example.com",2,null,3,0,0];
         $this->compareExpectations($state);
     }
 
-    function testMoveSubscriptionToAMissingFolder() {
+    function testMoveASubscriptionToAMissingFolder() {
         $this->assertException("idMissing", "Db", "ExceptionInput");
-        Data::$db->subscriptionPropertiesSet($this->user, 1,[
-            'folder' => 4,
-        ]);
+        Data::$db->subscriptionPropertiesSet($this->user, 1, ['folder' => 4]);
+    }
+
+    function testRenameASubscriptionToABlankTitle() {
+        $this->assertException("missing", "Db", "ExceptionInput");
+        Data::$db->subscriptionPropertiesSet($this->user, 1, ['title' => ""]);
+    }
+
+    function testRenameASubscriptionToAWhitespaceTitle() {
+        $this->assertException("whitespace", "Db", "ExceptionInput");
+        Data::$db->subscriptionPropertiesSet($this->user, 1, ['title' => "    "]);
+    }
+
+    function testRenameASubscriptionToFalse() {
+        $this->assertException("missing", "Db", "ExceptionInput");
+        Data::$db->subscriptionPropertiesSet($this->user, 1, ['title' => false]);
+    }
+
+    function testRenameASubscriptionToZero() {
+        $this->assertTrue(Data::$db->subscriptionPropertiesSet($this->user, 1, ['title' => 0]));
     }
 
     function testSetThePropertiesOfAMissingSubscription() {
-        $this->assertException("idMissing", "Db", "ExceptionInput");
-        Data::$db->subscriptionPropertiesSet($this->user, 2112,[
-            'folder' => null,
-        ]);
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
+        Data::$db->subscriptionPropertiesSet($this->user, 2112, ['folder' => null]);
     }
 
     function testSetThePropertiesOfASubscriptionWithoutAuthority() {
         Phake::when(Data::$user)->authorize->thenReturn(false);
         $this->assertException("notAuthorized", "User", "ExceptionAuthz");
-        Data::$db->subscriptionPropertiesSet($this->user, 1,[
-            'folder' => null,
-        ]);
+        Data::$db->subscriptionPropertiesSet($this->user, 1, ['folder' => null]);
     }
 }
\ No newline at end of file