diff --git a/tests/lib/Mapper/NotificationMapperTest.php b/tests/lib/Mapper/NotificationMapperTest.php
new file mode 100644
index 0000000..f2d29ff
--- /dev/null
+++ b/tests/lib/Mapper/NotificationMapperTest.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Notifications\Mapper;
+
+use Ibexa\Contracts\Notifications\Value\Notification\SymfonyNotificationAdapter;
+use Ibexa\Contracts\Notifications\Value\NotificationInterface;
+use Ibexa\Core\Base\Exceptions\InvalidArgumentException;
+use Ibexa\Notifications\Mapper\NotificationMapper;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Notifier\Notification\Notification;
+
+final class NotificationMapperTest extends TestCase
+{
+    private NotificationMapper $mapper;
+
+    public function setUp(): void
+    {
+        $this->mapper = new NotificationMapper();
+    }
+
+    public function testMapToSymfonyNotification(): void
+    {
+        $notification = $this->createMock(Notification::class);
+
+        $symfonyNotification = $this->mapper->mapToSymfonyNotification(
+            new SymfonyNotificationAdapter($notification)
+        );
+
+        $this->assertSame($notification, $symfonyNotification);
+    }
+
+    public function testMapToSymfonyNotificationThrowsExceptionOnInvalidNotification(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+
+        $this->mapper->mapToSymfonyNotification(
+            $this->createMock(NotificationInterface::class)
+        );
+    }
+}
diff --git a/tests/lib/Mapper/RecipientMapperTest.php b/tests/lib/Mapper/RecipientMapperTest.php
new file mode 100644
index 0000000..ac85159
--- /dev/null
+++ b/tests/lib/Mapper/RecipientMapperTest.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Notifications\Mapper;
+
+use Ibexa\Contracts\Notifications\Value\Recipent\SymfonyRecipientAdapter;
+use Ibexa\Contracts\Notifications\Value\RecipientInterface;
+use Ibexa\Core\Base\Exceptions\InvalidArgumentException;
+use Ibexa\Notifications\Mapper\RecipientMapper;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Notifier\Recipient\Recipient;
+
+final class RecipientMapperTest extends TestCase
+{
+    private RecipientMapper $mapper;
+
+    public function setUp(): void
+    {
+        $this->mapper = new RecipientMapper();
+    }
+
+    public function testMapToSymfonyRecipient(): void
+    {
+        $recipient = $this->createMock(Recipient::class);
+
+        $symfonyRecipient = $this->mapper->mapToSymfonyRecipient(
+            new SymfonyRecipientAdapter($recipient)
+        );
+
+        $this->assertSame($recipient, $symfonyRecipient);
+    }
+
+    public function testMapToSymfonyRecipientThrowsExceptionOnInvalidRecipient(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+
+        $this->mapper->mapToSymfonyRecipient(
+            $this->createMock(RecipientInterface::class)
+        );
+    }
+}
diff --git a/tests/lib/SubscriptionResolver/ChainSubscriptionResolverTest.php b/tests/lib/SubscriptionResolver/ChainSubscriptionResolverTest.php
new file mode 100644
index 0000000..614cd90
--- /dev/null
+++ b/tests/lib/SubscriptionResolver/ChainSubscriptionResolverTest.php
@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Notifications\SubscriptionResolver;
+
+use Ibexa\Contracts\Notifications\Value\NotificationInterface;
+use Ibexa\Notifications\SubscriptionResolver\ChainSubscriptionResolver;
+use Ibexa\Notifications\SubscriptionResolver\SubscriptionResolverInterface;
+use PHPUnit\Framework\TestCase;
+
+final class ChainSubscriptionResolverTest extends TestCase
+{
+    /**
+     * @dataProvider provideForTestResolve
+     *
+     * @param array<\Ibexa\Notifications\SubscriptionResolver\SubscriptionResolverInterface> $resolvers
+     * @param array<string|null> $expectedChannels
+     */
+    public function testResolve(array $resolvers, array $expectedChannels): void
+    {
+        $subscriptionResolver = new ChainSubscriptionResolver($resolvers);
+
+        $notification = $this->createMock(NotificationInterface::class);
+        $channels = $subscriptionResolver->resolve($notification);
+
+        $this->assertSame($expectedChannels, iterator_to_array($channels));
+    }
+
+    /**
+     * @return iterable<string, array{
+     *     array<\Ibexa\Notifications\SubscriptionResolver\SubscriptionResolverInterface|null>,
+     *     array<string>,
+     * }>
+     */
+    public function provideForTestResolve(): iterable
+    {
+        yield 'returns all results' => [
+            [
+                $this->mockResolver(['sms', 'mail']),
+                $this->mockResolver(['push']),
+            ],
+            ['sms', 'mail', 'push'],
+        ];
+
+        yield 'skips empty channels' => [
+            [
+                $this->mockResolver(['sms', null, null]),
+                $this->mockResolver([null, 'push', null]),
+            ],
+            ['sms', 'push'],
+        ];
+    }
+
+    /**
+     * @param array<string|null> $channels
+     *
+     * @return \Ibexa\Notifications\SubscriptionResolver\SubscriptionResolverInterface&\PHPUnit\Framework\MockObject\MockObject
+     */
+    private function mockResolver(array $channels): SubscriptionResolverInterface
+    {
+        $subscriptionResolver = $this->createMock(SubscriptionResolverInterface::class);
+        $subscriptionResolver
+            ->method('resolve')
+            ->willReturn($channels);
+
+        return $subscriptionResolver;
+    }
+}
diff --git a/tests/lib/SubscriptionResolver/ConfigBasedSubscriptionResolverTest.php b/tests/lib/SubscriptionResolver/ConfigBasedSubscriptionResolverTest.php
new file mode 100644
index 0000000..e5fdc30
--- /dev/null
+++ b/tests/lib/SubscriptionResolver/ConfigBasedSubscriptionResolverTest.php
@@ -0,0 +1,103 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Notifications\SubscriptionResolver;
+
+use Ibexa\Contracts\Core\SiteAccess\ConfigResolverInterface;
+use Ibexa\Contracts\Notifications\Value\NotificationInterface;
+use Ibexa\Notifications\SubscriptionResolver\ConfigBasedSubscriptionResolver;
+use Ibexa\Notifications\Value\ChannelSubscription;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @phpstan-type TSubscriptionsConfig array<string, array{channels: array<string>}>
+ */
+final class ConfigBasedSubscriptionResolverTest extends TestCase
+{
+    private ConfigBasedSubscriptionResolver $resolver;
+
+    /** @var \Ibexa\Contracts\Core\SiteAccess\ConfigResolverInterface|\PHPUnit\Framework\MockObject\MockObject */
+    private ConfigResolverInterface $configResolver;
+
+    public function setUp(): void
+    {
+        $this->configResolver = $this->createMock(ConfigResolverInterface::class);
+        $this->resolver = new ConfigBasedSubscriptionResolver($this->configResolver);
+    }
+
+    /**
+     * @dataProvider provideForTestResolve
+     *
+     * @phpstan-param TSubscriptionsConfig $subscriptions
+     *
+     * @param array<string> $expectedChannels
+     */
+    public function testResolve(
+        array $subscriptions,
+        string $notificationType,
+        array $expectedChannels
+    ): void {
+        $this->configResolver
+            ->method('getParameter')
+            ->willReturn($subscriptions);
+
+        $notification = $this->createMock(NotificationInterface::class);
+        $notification
+            ->method('getType')
+            ->willReturn($notificationType);
+
+        $subscriptions = $this->resolver->resolve($notification);
+        $subscriptionsArray = iterator_to_array($subscriptions);
+
+        $this->assertCount(count($expectedChannels), $subscriptionsArray);
+        $this->assertContainsOnlyInstancesOf(ChannelSubscription::class, $subscriptionsArray);
+
+        $i = 0;
+        foreach ($subscriptionsArray as $channelSubscription) {
+            $this->assertSame($notificationType, $channelSubscription->getNotificationType());
+            $this->assertSame($expectedChannels[$i++], $channelSubscription->getChannel());
+        }
+    }
+
+    /**
+     * @return iterable<string, array{
+     *      TSubscriptionsConfig,
+     *      string,
+     *      array<string>,
+     *  }>
+     */
+    public function provideForTestResolve(): iterable
+    {
+        $config = [
+            NotificationInterface::class => [
+                'channels' => ['sms', 'mail', 'push'],
+            ],
+            '\\Vendor\\Package\\Notification\\ActionSuccess' => [
+                'channels' => ['browser'],
+            ],
+        ];
+
+        yield 'NotificationInterface type' => [
+            $config,
+            NotificationInterface::class,
+            ['sms', 'mail', 'push'],
+        ];
+
+        yield '\\Vendor\\Package\\Notification\\ActionSuccess type' => [
+            $config,
+            '\\Vendor\\Package\\Notification\\ActionSuccess',
+            ['browser'],
+        ];
+
+        yield 'no subscriptions when not configured' => [
+            $config,
+            '\\Vendor\\Package\\Notification\\NotConfigured',
+            [],
+        ];
+    }
+}