diff --git a/.gitignore b/.gitignore
index 2e2f690..905e7e3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
-/app/.phpunit.result.cache
 /.phpunit.result.cache
diff --git a/app/.gitignore b/app/.gitignore
index f6ed8cb..cc1eb0b 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -1,2 +1,3 @@
 /.env
+/.phpunit.result.cache
 /phpunit.xml
diff --git a/app/src/Service/Mattermost/MattermostService.php b/app/src/Service/Mattermost/MattermostService.php
index 0adae23..d72bca1 100644
--- a/app/src/Service/Mattermost/MattermostService.php
+++ b/app/src/Service/Mattermost/MattermostService.php
@@ -42,8 +42,11 @@ class MattermostService extends BaseService implements MattermostServiceInterfac
 
         $string = '';
         foreach ($alertmanagerMessage->getAlerts() as $num => $message) {
+            if ('' !== $string) {
+                $string .= "\n --- \n";
+            }
             $string .= sprintf(
-                "message %s\n - description: %s\n - summary: %s\n\n --- ",
+                "message %s\n - description: %s\n - summary: %s\n",
                 $num,
                 $message->getAnnotations()->getDescription(),
                 $message->getAnnotations()->getSummary()
diff --git a/app/tests/Unit/Model/Grafana/GrafanaMessageTest.php b/app/tests/Unit/Model/Grafana/GrafanaMessageTest.php
index 183b146..3941ba7 100644
--- a/app/tests/Unit/Model/Grafana/GrafanaMessageTest.php
+++ b/app/tests/Unit/Model/Grafana/GrafanaMessageTest.php
@@ -251,6 +251,36 @@ final class GrafanaMessageTest extends UnitTester
         );
     }
 
+    /**
+     * @throws ReflectionException
+     */
+    public function testGetRuleUrl(): void
+    {
+        $grafanaMessage = new GrafanaMessage();
+        $value = $this->faker->sha256();
+
+        $property = $this->getClassProperty($grafanaMessage, 'ruleUrl');
+        $property->setValue($grafanaMessage, $value);
+
+        self::assertEquals($value, $grafanaMessage->getRuleUrl());
+    }
+
+    /**
+     * @throws ReflectionException
+     */
+    public function testSetRuleUrl(): void
+    {
+        $grafanaMessage = new GrafanaMessage();
+        $value = $this->faker->sha256();
+
+        self::assertEquals($grafanaMessage, $grafanaMessage->setRuleUrl($value));
+        self::assertEquals(
+            $value,
+            ($this->getClassProperty($grafanaMessage, 'ruleUrl'))
+                ->getValue($grafanaMessage)
+        );
+    }
+
     /**
      * @throws ReflectionException
      */
diff --git a/app/tests/Unit/Service/Mattermost/MattermostServiceTest.php b/app/tests/Unit/Service/Mattermost/MattermostServiceTest.php
index 0d1ab8f..59b1e07 100644
--- a/app/tests/Unit/Service/Mattermost/MattermostServiceTest.php
+++ b/app/tests/Unit/Service/Mattermost/MattermostServiceTest.php
@@ -4,12 +4,16 @@ declare(strict_types=1);
 
 namespace App\Tests\Unit\Service\Mattermost;
 
+use App\Model\Alertmanager\Alert;
+use App\Model\Alertmanager\AlertmanagerMessage;
+use App\Model\Alertmanager\Annotation;
 use App\Model\Grafana\GrafanaMessage;
 use App\Service\BaseService;
 use App\Service\Mattermost\MattermostService;
 use App\Service\Mattermost\MattermostServiceInterface;
 use Faker\Factory;
 use GuzzleHttp\Client;
+use GuzzleHttp\Exception\GuzzleException;
 use GuzzleHttp\Psr7\Request;
 use App\Tests\Unit\UnitTester;
 use Psr\Http\Message\ResponseInterface;
@@ -31,18 +35,118 @@ final class MattermostServiceTest extends UnitTester
         self::assertInstanceOf(MattermostServiceInterface::class, $stub);
     }
 
+    /**
+     * @dataProvider sendAlertmanagerMessageDataProvider
+     * @throws GuzzleException
+     * @throws \JsonException
+     * @throws ReflectionException
+     */
+    public function testSendAlertmanagerMessage(
+        string              $mattermostUrl,
+        string              $mattermostUri,
+        string              $channelName,
+        string              $botName,
+        string              $botIcon,
+        AlertmanagerMessage $alertmanagerMessage,
+        array               $options
+    ): void
+    {
+        $mattermostService = new MattermostService(
+            $mattermostUrl, $mattermostUri, $channelName, $botName, $botIcon
+        );
+        $clientMock = $this->getMockBuilder(Client::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['send'])
+            ->getMock();
+        $clientProperty = $this->getClassProperty($mattermostService, 'client');
+        $clientProperty->setValue($mattermostService, $clientMock);
+        $responseMock = $this->getMockForAbstractClass(ResponseInterface::class);
+        $request = new Request('POST', $mattermostUri);
+
+        $clientMock->expects(self::once())
+            ->method('send')
+            ->with($request, $options)
+            ->willReturn($responseMock);
+
+        self::assertEquals(
+            $responseMock,
+            $mattermostService->sendAlertmanagerMessage($alertmanagerMessage)
+        );
+    }
+
+    /**
+     * @throws GuzzleException
+     * @throws \JsonException
+     */
+    public function sendAlertmanagerMessageDataProvider(): array
+    {
+        $faker = (Factory::create('en_EN'));
+        $channelName = $faker->sha256();
+        $botName = $faker->sha256();
+        $botIcon = $faker->sha256();
+        $description = [
+            $faker->sha256(),
+            $faker->sha256()
+        ];
+        $summary = [
+            $faker->sha256(),
+            $faker->sha256()
+        ];
+
+        return [
+            [
+                'mattermostUrl' => $faker->sha256(),
+                'mattermostUri' => $faker->sha256(),
+                'channelName' => $channelName,
+                'botName' => $botName,
+                'botIcon' => $botIcon,
+                'message' =>
+                    (new AlertmanagerMessage())
+                        ->setAlerts([
+                                (new Alert())
+                                    ->setAnnotations(
+                                        (new Annotation())
+                                            ->setDescription($description[0])
+                                            ->setSummary($summary[0])
+                                    ),
+                                (new Alert())
+                                    ->setAnnotations(
+                                        (new Annotation())
+                                            ->setDescription($description[1])
+                                            ->setSummary($summary[1])
+                                    )
+                            ]
+                        ),
+                'options' => [
+                    'headers' => [
+                        'Content-Type' => 'application/json',
+                    ],
+                    'body' => json_encode([
+                        'channel' => $channelName,
+                        'username' => $botName,
+                        'icon_url' => $botIcon,
+                        'text' => sprintf(
+                            "message %s\n - description: %s\n - summary: %s\n\n --- \nmessage %s\n - description: %s\n - summary: %s\n",
+                            0, $description[0], $summary[0], 1, $description[1], $summary[1],
+                        ),
+                    ], JSON_THROW_ON_ERROR),
+                ]
+            ]
+        ];
+    }
+
     /**
      * @dataProvider sendGrafanaMessageDataProvider
      * @throws ReflectionException
      */
     public function testSendGrafanaMessage(
-        string $mattermostUrl,
-        string $mattermostUri,
-        string $channelName,
-        string $botName,
-        string $botIcon,
+        string         $mattermostUrl,
+        string         $mattermostUri,
+        string         $channelName,
+        string         $botName,
+        string         $botIcon,
         GrafanaMessage $grafanaMessage,
-        array $options
+        array          $options
     ): void
     {
         $mattermostService = new MattermostService(