diff --git a/tests/Feature/Auth/AuthenticationTest.php b/tests/Feature/Auth/AuthenticationTest.php
index 060b1218..8a49a676 100644
--- a/tests/Feature/Auth/AuthenticationTest.php
+++ b/tests/Feature/Auth/AuthenticationTest.php
@@ -12,6 +12,26 @@
     $response->assertOk();
 });
 
+test('login page exposes selfHosted as false when SELF_HOSTED is off', function () {
+    config()->set('trypost.self_hosted', false);
+
+    $response = $this->get(route('login'));
+
+    $response->assertOk();
+    $page = $response->original->getData()['page'];
+    expect($page['props']['selfHosted'])->toBeFalse();
+});
+
+test('login page exposes selfHosted as true when SELF_HOSTED is on', function () {
+    config()->set('trypost.self_hosted', true);
+
+    $response = $this->get(route('login'));
+
+    $response->assertOk();
+    $page = $response->original->getData()['page'];
+    expect($page['props']['selfHosted'])->toBeTrue();
+});
+
 test('users can authenticate using the login screen', function () {
     $user = User::factory()->create();
 
diff --git a/tests/Feature/Auth/RegistrationTest.php b/tests/Feature/Auth/RegistrationTest.php
index 466a40d2..495791ca 100644
--- a/tests/Feature/Auth/RegistrationTest.php
+++ b/tests/Feature/Auth/RegistrationTest.php
@@ -168,6 +168,19 @@
     expect(User::where('email', 'invitee@example.com')->exists())->toBeTrue();
 });
 
+test('register POST passes when self_hosted with invite query param even without prior session', function () {
+    config()->set('trypost.self_hosted', true);
+
+    $response = $this->post(route('register.store', ['invite' => 'invite-xyz']), [
+        'name' => 'Invitee',
+        'email' => 'invitee@example.com',
+        'password' => 'Password123!',
+    ]);
+
+    $response->assertSessionHasNoErrors();
+    expect(User::where('email', 'invitee@example.com')->exists())->toBeTrue();
+});
+
 test('register works normally when not self_hosted even with pending invite in session', function () {
     config()->set('trypost.self_hosted', false);
 
diff --git a/tests/Feature/Database/UserSeederTest.php b/tests/Feature/Database/UserSeederTest.php
new file mode 100644
index 00000000..b8a98dfa
--- /dev/null
+++ b/tests/Feature/Database/UserSeederTest.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\User;
+use Database\Seeders\UserSeeder;
+
+test('seeder creates the admin user and a workspace when database is empty', function () {
+    expect(User::count())->toBe(0);
+
+    $this->seed(UserSeeder::class);
+
+    $admin = User::where('email', 'admin@trypost.it')->first();
+
+    expect($admin)->not->toBeNull();
+    expect($admin->account_id)->not->toBeNull();
+    expect($admin->workspaces()->count())->toBe(1);
+});
+
+test('seeder is idempotent when a user already exists', function () {
+    User::factory()->create();
+
+    $this->seed(UserSeeder::class);
+
+    expect(User::where('email', 'admin@trypost.it')->exists())->toBeFalse();
+});