diff --git a/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php b/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php
new file mode 100644
index 0000000..bb77181
--- /dev/null
+++ b/tests/Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php
@@ -0,0 +1,9 @@
+<?php
+declare(strict_types=1);
+namespace JKingWeb\Arsse;
+
+class TestDatabaseSubscriptionSQLite3 extends \PHPUnit\Framework\TestCase {
+    use Test\Tools, Test\Database\Setup;
+    use Test\Database\DriverSQLite3;
+    use Test\Database\SeriesSubscription;
+}
\ No newline at end of file
diff --git a/tests/lib/Database/SeriesSubscription.php b/tests/lib/Database/SeriesSubscription.php
new file mode 100644
index 0000000..e62ea4e
--- /dev/null
+++ b/tests/lib/Database/SeriesSubscription.php
@@ -0,0 +1,97 @@
+<?php
+declare(strict_types=1);
+namespace JKingWeb\Arsse\Test\Database;
+use JKingWeb\Arsse\Data;
+use JKingWeb\Arsse\Test\Database;
+use JKingWeb\Arsse\User\Driver as UserDriver;
+use JKingWeb\Arsse\Feed\Exception as FeedException;
+use Phake;
+
+trait SeriesSubscription {
+    function setUpSeries() {
+        $data = [
+            'arsse_feeds' => [
+                'columns' => [
+                    'id'        => "int",
+                    'url'       => "str",
+                    'title'     => "str",
+                    'username'  => "str",
+                    'password'  => "str",
+                ],
+                'rows' => [
+                    [1,"http://example.com/feed1", "Ook", "", ""],
+                ]
+            ],
+            'arsse_subscriptions' => [
+                'columns' => [
+                    'id'    => "int",
+                    'owner' => "str",
+                    'feed'  => "int",
+                ],
+                'rows' => [
+
+                ]
+            ]
+        ];
+        // merge folder table with base user table
+        $this->data = array_merge($this->data, $data);
+        $this->primeDatabase($this->data);
+        // initialize a partial mock of the Database object to later manipulate the feedUpdate method
+        Data::$db = Phake::PartialMock(Database::class, $this->drv);
+    }
+
+    function testAddASubscriptionToAnExistingFeed() {
+        $user = "john.doe@example.com";
+        $url = "http://example.com/feed1";
+        $subID = $this->nextID("arsse_subscriptions");
+        Phake::when(Data::$db)->feedUpdate->thenReturn(true);
+        $this->assertSame($subID,Data::$db->subscriptionAdd($user, $url));
+        Phake::verify(Data::$user)->authorize($user, "subscriptionAdd");
+        Phake::verify(Data::$db, Phake::times(0))->feedUpdate(1, true);
+        $state = $this->primeExpectations($this->data, [
+            'arsse_feeds'         => ['id','url','username','password'],
+            'arsse_subscriptions' => ['id','owner','feed'],
+        ]);
+        $state['arsse_subscriptions']['rows'][] = [$subID,$user,1];
+        $this->compareExpectations($state);
+    }
+
+    function testAddASubscriptionToANewFeed() {
+        $user = "john.doe@example.com";
+        $url = "http://example.org/feed1";
+        $feedID = $this->nextID("arsse_feeds");
+        $subID = $this->nextID("arsse_subscriptions");
+        Phake::when(Data::$db)->feedUpdate->thenReturn(true);
+        $this->assertSame($subID,Data::$db->subscriptionAdd($user, $url));
+        Phake::verify(Data::$user)->authorize($user, "subscriptionAdd");
+        Phake::verify(Data::$db)->feedUpdate($feedID, true);
+        $state = $this->primeExpectations($this->data, [
+            'arsse_feeds'         => ['id','url','username','password'],
+            'arsse_subscriptions' => ['id','owner','feed'],
+        ]);
+        $state['arsse_feeds']['rows'][] = [$feedID,$url,"",""];
+        $state['arsse_subscriptions']['rows'][] = [$subID,$user,$feedID];
+        $this->compareExpectations($state);
+    }
+
+    function testAddASubscriptionToAnInvalidFeed() {
+        $user = "john.doe@example.com";
+        $url = "http://example.org/feed1";
+        $feedID = $this->nextID("arsse_feeds");
+        $subID = $this->nextID("arsse_subscriptions");
+        Phake::when(Data::$db)->feedUpdate->thenThrow(new FeedException($url, new \PicoFeed\Client\InvalidUrlException()));
+        try {
+            Data::$db->subscriptionAdd($user, $url);
+        } catch(FeedException $e) {
+            Phake::verify(Data::$user)->authorize($user, "subscriptionAdd");
+            Phake::verify(Data::$db)->feedUpdate($feedID, true);
+            $state = $this->primeExpectations($this->data, [
+                'arsse_feeds'         => ['id','url','username','password'],
+                'arsse_subscriptions' => ['id','owner','feed'],
+            ]);
+            $this->compareExpectations($state);
+            $this->assertException("invalidUrl", "Feed");
+            throw $e;
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 2024784..b235701 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -37,6 +37,7 @@
     <testsuite name="SQLite3 database functions">
         <file>Db/SQLite3/Database/TestDatabaseUserSQLite3.php</file>
         <file>Db/SQLite3/Database/TestDatabaseFolderSQLite3.php</file>
+        <file>Db/SQLite3/Database/TestDatabaseSubscriptionSQLite3.php</file>
     </testsuite>
     <testsuite name="NextCloud News API">
         <file>REST/NextCloudNews/TestNCNVersionDiscovery.php</file>