diff --git a/lib/Database.php b/lib/Database.php
index 48bf2bd..3a2bc08 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -328,11 +328,11 @@ class Database {
 
     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 no ID is specified this is a no-op, unless a parent is specified, which is always a circular dependence (the root cannot be moved)
             if(!is_null($parent)) {
-                throw new Db\ExceptionInput("circularDependence", ["action" => $this->caller(), "field" => "parent", 'id' => $parent]);
+                throw new Db\ExceptionInput("circularDependence", ["action" => $this->caller(), "field" => "parent", 'id' => $parent]); // @codeCoverageIgnore
             }
-            return [name => null, parent => null];
+            return ['name' => null, 'parent' => null];
         }
         // 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();
diff --git a/tests/Db/SQLite3/Database/TestDatabaseArticleSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseArticleSQLite3.php
index 1a03414..ebd46f2 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseArticleSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseArticleSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseArticleSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/Db/SQLite3/Database/TestDatabaseFeedSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseFeedSQLite3.php
index 6af2982..7db96a3 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseFeedSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseFeedSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseFeedSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/Db/SQLite3/Database/TestDatabaseFolderSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseFolderSQLite3.php
index 02b64dc..448b046 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseFolderSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseFolderSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseFolderSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/Db/SQLite3/Database/TestDatabaseMetaSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseMetaSQLite3.php
index 87c22ec..e9e132b 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseMetaSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseMetaSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseMetaSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/Db/SQLite3/Database/TestDatabaseMiscellanySQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseMiscellanySQLite3.php
new file mode 100644
index 0000000..7075c3e
--- /dev/null
+++ b/tests/Db/SQLite3/Database/TestDatabaseMiscellanySQLite3.php
@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+namespace JKingWeb\Arsse;
+
+/** @covers \JKingWeb\Arsse\Database<extended> */
+class TestDatabaseMiscellanySQLite3 extends Test\AbstractTest {
+    use Test\Database\Setup;
+    use Test\Database\DriverSQLite3;
+    use Test\Database\SeriesMiscellany;
+}
\ No newline at end of file
diff --git a/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php
index 9992d8f..bf30662 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseSubscriptionSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/Db/SQLite3/Database/TestDatabaseUserSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseUserSQLite3.php
index 5bf1a1b..dfba48b 100644
--- a/tests/Db/SQLite3/Database/TestDatabaseUserSQLite3.php
+++ b/tests/Db/SQLite3/Database/TestDatabaseUserSQLite3.php
@@ -2,7 +2,7 @@
 declare(strict_types=1);
 namespace JKingWeb\Arsse;
 
-/** @covers \JKingWeb\Arsse\Database */
+/** @covers \JKingWeb\Arsse\Database<extended> */
 class TestDatabaseUserSQLite3 extends Test\AbstractTest {
     use Test\Database\Setup;
     use Test\Database\DriverSQLite3;
diff --git a/tests/docroot/Feed/Parsing/Valid.php b/tests/docroot/Feed/Parsing/Valid.php
index 8e0a3ca..ca376cc 100644
--- a/tests/docroot/Feed/Parsing/Valid.php
+++ b/tests/docroot/Feed/Parsing/Valid.php
@@ -18,6 +18,8 @@
     </item>
     <item>
         <dc:identifier>urn:uuid:43fb1908-42ec-11e7-b61b-2b118faca2f2</dc:identifier> <!-- Correct ID -->
+        <enclosure url="http://example.com/svg" type="image/svg"/>
+        <category>HLN</category>
     </item>
     <item>
         <link>http://example.com/2</link>
diff --git a/tests/lib/Database/SeriesFeed.php b/tests/lib/Database/SeriesFeed.php
index 50fe3c6..7545d5c 100644
--- a/tests/lib/Database/SeriesFeed.php
+++ b/tests/lib/Database/SeriesFeed.php
@@ -87,6 +87,7 @@ trait SeriesFeed {
                     [4,1,'http://example.com/4','Article title 4','','2000-01-04 00:00:00','2000-01-04 00:00:00','<p>Article content 4</p>','804e517d623390e71497982c77cf6823180342ebcd2e7d5e32da1e55b09dd180','f3615c7f16336d3ea242d35cf3fc17dbc4ee3afb78376bf49da2dd7a5a25dec8','f11c2b4046f207579aeb9c69a8c20ca5461cef49756ccfa5ba5e2344266da3b3','ab2da63276acce431250b18d3d49b988b226a99c7faadf275c90b751aee05be9',$past],
                     [5,1,'http://example.com/5','Article title 5','','2000-01-05 00:00:00','2000-01-05 00:00:00','<p>Article content 5</p>','db3e736c2c492f5def5c5da33ddcbea1824040e9ced2142069276b0a6e291a41','d40da96e39eea6c55948ccbe9b3d275b5f931298288dbe953990c5f496097022','834240f84501b5341d375414718204ec421561f3825d34c22bf9182203e42900','43b970ac6ec5f8a9647b2c7e4eed8b1d7f62e154a95eed748b0294c1256764ba',$past],
                     [6,2,'http://example.com/1','Article title 1','','2000-01-01 00:00:00','2000-01-01 00:00:00','<p>Article content 1</p>','e433653cef2e572eee4215fa299a4a5af9137b2cefd6283c85bd69a32915beda','f5cb8bfc1c7396dc9816af212a3e2ac5221585c2a00bf7ccb6aabd95dcfcd6a6','fb0bc8f8cb08913dc5a497db700e327f1d34e4987402687d494a5891f24714d4','18fdd4fa93d693128c43b004399e5c9cea6c261ddfa002518d3669f55d8c2207',$past],
+                    [7,5,''                    ,''               ,'','2000-01-01 00:00:00','2000-01-01 00:00:00',''                        ,'205e986f4f8b3acfa281227beadb14f5e8c32c8dae4737f888c94c0df49c56f8',''                                                                ,''                                                                ,''                                                                ,$past],
                 ]
             ],
             'arsse_editions' => [
@@ -125,17 +126,21 @@ trait SeriesFeed {
             ],
             'arsse_enclosures' => [
                 'columns' => [
+                    'article' => "int",
                     'url'     => "str",
                     'type'    => "str",
                 ],
                 'rows' => [
+                    [7,'http://example.com/png','image/png'],
                 ]
             ],
             'arsse_categories' => [
                 'columns' => [
+                    'article' => "int",
                     'name'     => "str",
                 ],
                 'rows' => [
+                    [7,'Syrinx']
                 ]
             ],
         ];
@@ -167,9 +172,9 @@ trait SeriesFeed {
         ]);
         $state['arsse_articles']['rows'][2] = [3,1,'http://example.com/3','Article title 3 (updated)','','2000-01-03 00:00:00','2000-01-03 00:00:00','<p>Article content 3</p>','31a6594500a48b59fcc8a075ce82b946c9c3c782460d088bd7b8ef3ede97ad92','6cc99be662ef3486fef35a890123f18d74c29a32d714802d743c5b4ef713315a','b278380e984cefe63f0e412b88ffc9cb0befdfa06fdc00bace1da99a8daff406','d5faccc13bf8267850a1e8e61f95950a0f34167df2c8c58011c0aaa6367026ac',$now];
         $state['arsse_articles']['rows'][3] = [4,1,'http://example.com/4','Article title 4','','2000-01-04 00:00:00','2000-01-04 00:00:01','<p>Article content 4</p>','804e517d623390e71497982c77cf6823180342ebcd2e7d5e32da1e55b09dd180','f3615c7f16336d3ea242d35cf3fc17dbc4ee3afb78376bf49da2dd7a5a25dec8','f11c2b4046f207579aeb9c69a8c20ca5461cef49756ccfa5ba5e2344266da3b3','ab2da63276acce431250b18d3d49b988b226a99c7faadf275c90b751aee05be9',$now];
-        $state['arsse_articles']['rows'][]  = [7,1,'http://example.com/6','Article title 6','','2000-01-06 00:00:00','2000-01-06 00:00:00','<p>Article content 6</p>','b3461ab8e8759eeb1d65a818c65051ec00c1dfbbb32a3c8f6999434e3e3b76ab','91d051a8e6749d014506848acd45e959af50bf876427c4f0e3a1ec0f04777b51','211d78b1a040d40d17e747a363cc283f58767b2e502630d8de9b8f1d5e941d18','5ed68ccb64243b8c1931241d2c9276274c3b1d87f223634aa7a1ab0141292ca7',$now];
+        $state['arsse_articles']['rows'][]  = [8,1,'http://example.com/6','Article title 6','','2000-01-06 00:00:00','2000-01-06 00:00:00','<p>Article content 6</p>','b3461ab8e8759eeb1d65a818c65051ec00c1dfbbb32a3c8f6999434e3e3b76ab','91d051a8e6749d014506848acd45e959af50bf876427c4f0e3a1ec0f04777b51','211d78b1a040d40d17e747a363cc283f58767b2e502630d8de9b8f1d5e941d18','5ed68ccb64243b8c1931241d2c9276274c3b1d87f223634aa7a1ab0141292ca7',$now];
         $state['arsse_editions']['rows'] = array_merge($state['arsse_editions']['rows'], [
-            [6,7,$now],
+            [6,8,$now],
             [7,3,$now],
             [8,4,$now],
         ]);
@@ -194,6 +199,11 @@ trait SeriesFeed {
         $this->compareExpectations($state);
     }
 
+    function testUpdateAMissingFeed() {
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
+        Arsse::$db->feedUpdate(2112);
+    }
+
     function testUpdateAFeedThrowingExceptions() {
         $this->assertException("invalidUrl", "Feed");
         Arsse::$db->feedUpdate(3, true);
@@ -205,13 +215,17 @@ trait SeriesFeed {
             'arsse_enclosures' => ["url","type"],
             'arsse_categories' => ["name"],
         ]);
-        $state['arsse_enclosures']['rows'][] = ['http://example.com/text','text/plain'];
-        $state['arsse_categories']['rows'] = array_merge($state['arsse_categories']['rows'], [
+        $state['arsse_enclosures']['rows'] = [
+            ['http://example.com/svg','image/svg'],
+            ['http://example.com/text','text/plain'],
+        ];
+        $state['arsse_categories']['rows'] = [
+            ["HLN"],
             ["Aniki!"],
             ["Beams"],
             ["Bodybuilders"],
             ["Men"],
-        ]);
+        ];
         $this->compareExpectations($state);
     }
 
diff --git a/tests/lib/Database/SeriesFolder.php b/tests/lib/Database/SeriesFolder.php
index 2d5f58a..4c5be19 100644
--- a/tests/lib/Database/SeriesFolder.php
+++ b/tests/lib/Database/SeriesFolder.php
@@ -225,6 +225,16 @@ trait SeriesFolder {
         $this->compareExpectations($state);
     }
 
+    function testRenameAFolderToTheEmptyString() {
+        $this->assertException("missing", "Db", "ExceptionInput");
+        $this->assertTrue(Arsse::$db->folderPropertiesSet("john.doe@example.com", 6, ['name' => ""]));
+    }
+
+    function testRenameAFolderToWhitespaceOnly() {
+        $this->assertException("whitespace", "Db", "ExceptionInput");
+        $this->assertTrue(Arsse::$db->folderPropertiesSet("john.doe@example.com", 6, ['name' => "   "]));
+    }
+
     function testMoveAFolder() {
         $this->assertTrue(Arsse::$db->folderPropertiesSet("john.doe@example.com", 6, ['parent' => 5]));
         Phake::verify(Arsse::$user)->authorize("john.doe@example.com", "folderPropertiesSet");
diff --git a/tests/lib/Database/SeriesMiscellany.php b/tests/lib/Database/SeriesMiscellany.php
new file mode 100644
index 0000000..eacf879
--- /dev/null
+++ b/tests/lib/Database/SeriesMiscellany.php
@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+namespace JKingWeb\Arsse\Test\Database;
+use JKingWeb\Arsse\Arsse;
+use JKingWeb\Arsse\Database;
+
+trait SeriesMiscellany {
+
+    function testListDrivers() {
+        $exp = [
+            'JKingWeb\\Arsse\\Db\\SQLite3\\Driver' => Arsse::$lang->msg("Driver.Db.SQLite3.Name"),
+        ];
+        $this->assertArraySubset($exp, Database::driverList());
+    }
+
+    function testInitializeDatabase() {
+        $d = new Database();
+        $this->assertSame(Database::SCHEMA_VERSION, $d->driverSchemaVersion());
+    }
+
+    function testManuallyInitializeDatabase() {
+        $d = new Database(false);
+        $this->assertSame(0, $d->driverSchemaVersion());
+        $this->assertTrue($d->driverSchemaUpdate());
+        $this->assertSame(Database::SCHEMA_VERSION, $d->driverSchemaVersion());
+        $this->assertFalse($d->driverSchemaUpdate());
+    }
+}
\ No newline at end of file
diff --git a/tests/lib/Database/SeriesSubscription.php b/tests/lib/Database/SeriesSubscription.php
index 92e8a5b..74f70f8 100644
--- a/tests/lib/Database/SeriesSubscription.php
+++ b/tests/lib/Database/SeriesSubscription.php
@@ -264,6 +264,17 @@ trait SeriesSubscription {
         Arsse::$db->subscriptionList($this->user);
     }
 
+    function testGetThePropertiesOfAMissingSubscription() {
+        $this->assertException("subjectMissing", "Db", "ExceptionInput");
+        Arsse::$db->subscriptionPropertiesGet($this->user, 2112);
+    }
+
+    function testGetThePropertiesOfASubscriptionWithoutAuthority() {
+        Phake::when(Arsse::$user)->authorize->thenReturn(false);
+        $this->assertException("notAuthorized", "User", "ExceptionAuthz");
+        Arsse::$db->subscriptionPropertiesGet($this->user, 1);
+    }
+
     function testSetThePropertiesOfASubscription() {
         Arsse::$db->subscriptionPropertiesSet($this->user, 1,[
             'title' => "Ook Ook",
@@ -290,6 +301,10 @@ trait SeriesSubscription {
         Arsse::$db->subscriptionPropertiesSet($this->user, 1, ['folder' => 4]);
     }
 
+    function testMoveASubscriptionToTheRootFolder() {
+        $this->assertTrue(Arsse::$db->subscriptionPropertiesSet($this->user, 3, ['folder' => null]));
+    }
+
     function testRenameASubscriptionToABlankTitle() {
         $this->assertException("missing", "Db", "ExceptionInput");
         Arsse::$db->subscriptionPropertiesSet($this->user, 1, ['title' => ""]);
diff --git a/tests/lib/Database/SeriesUser.php b/tests/lib/Database/SeriesUser.php
index e91ce6b..59f071e 100644
--- a/tests/lib/Database/SeriesUser.php
+++ b/tests/lib/Database/SeriesUser.php
@@ -43,6 +43,11 @@ trait SeriesUser {
         $this->assertTrue(password_verify("secret", $hash));
     }
 
+    function testGetThePasswordOfAMissingUser() {
+        $this->assertException("doesNotExist", "User");
+        Arsse::$db->userPasswordGet("john.doe@example.org");
+    }
+
     function testGetAPasswordWithoutAuthority() {
         Phake::when(Arsse::$user)->authorize->thenReturn(false);
         $this->assertException("notAuthorized", "User", "ExceptionAuthz");
@@ -145,6 +150,12 @@ trait SeriesUser {
         Phake::verify(Arsse::$user)->authorize($user, "userPasswordSet");
         $this->assertTrue(password_verify($pass, $hash), "Failed verifying password of $user '$pass' against hash '$hash'.");
     }
+    function testSetARandomPassword() {
+        $user = "john.doe@example.com";
+        $this->assertEquals("", Arsse::$db->userPasswordGet($user));
+        $pass = Arsse::$db->userPasswordSet($user);
+        $hash = Arsse::$db->userPasswordGet($user);
+    }
 
     function testSetThePasswordOfAMissingUser() {
         $this->assertException("doesNotExist", "User");
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 872077b..c17cfd8 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -53,6 +53,7 @@
         <file>Db/SQLite3/TestDbUpdateSQLite3.php</file>
     </testsuite>
     <testsuite name="Database functions">
+        <file>Db/SQLite3/Database/TestDatabaseMiscellanySQLite3.php</file>
         <file>Db/SQLite3/Database/TestDatabaseMetaSQLite3.php</file>
         <file>Db/SQLite3/Database/TestDatabaseUserSQLite3.php</file>
         <file>Db/SQLite3/Database/TestDatabaseFolderSQLite3.php</file>