diff --git a/openapi.yaml b/openapi.yaml
index bf75156e..531df490 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -11712,6 +11712,23 @@ paths:
               schema:
                 $ref: '#/components/schemas/SlackInternalDepartmentGoalProgressConfigResponse'
 
+  /slack/config/internal-department-goal-progress/test:
+    post:
+      tags: [Config]
+      summary: Test Slack internal department goal progress webhook
+      operationId: testSlackInternalDepartmentGoalProgressWebhook
+      responses:
+        '200':
+          description: Slack internal department goal progress webhook test completed successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SlackConfigTestResponse'
+        '400':
+          description: Slack internal department goal progress webhook URL is not configured
+        '502':
+          description: Slack internal department goal progress webhook test failed
+
   /backups/config:
     get:
       tags: [Config]
diff --git a/services/nginx/app/classes/slack.php b/services/nginx/app/classes/slack.php
index c45bfdf0..27fbfc8b 100644
--- a/services/nginx/app/classes/slack.php
+++ b/services/nginx/app/classes/slack.php
@@ -196,6 +196,42 @@ class slack implements notification_i
         ];
     }
 
+    /**
+     * Send a sanitized internal department goal progress test notification to the saved Slack webhook.
+     *
+     * @return array{configured:bool,sent:bool,message:string}
+     */
+    public function test_internal_department_goal_progress_webhook(): array
+    {
+        $webhook = $this->get_internal_department_goal_progress_webhook_url();
+        if ($webhook === '') {
+            return [
+                'configured' => false,
+                'sent' => false,
+                'message' => 'Slack internal department goal progress webhook URL is not configured.',
+            ];
+        }
+
+        $result = $this->send_webhook_message(
+            $this->format_internal_department_goal_progress_test(),
+            $webhook
+        );
+        $sent = $this->is_webhook_send_successful($result);
+
+        self::add_log($sent
+            ? 'Slack internal department goal progress test webhook sent successfully.'
+            : 'Slack internal department goal progress test webhook failed.'
+        );
+
+        return [
+            'configured' => true,
+            'sent' => $sent,
+            'message' => $sent
+                ? 'Slack test message sent successfully.'
+                : 'Slack test message failed.',
+        ];
+    }
+
     protected function get_customer_registration_webhook_url(): string
     {
         return trim((string)$this->getConfig()->customer_registration_webhook_url->getVariableValue());
@@ -287,4 +323,10 @@ class slack implements notification_i
         return "*Truck Wash Slack test*\n"
             . "Customer registration notifications are configured correctly.";
     }
+
+    public function format_internal_department_goal_progress_test(): string
+    {
+        return "*Truck Wash Slack test*\n"
+            . "Internal department goal progress notifications are configured correctly.";
+    }
 }
diff --git a/services/nginx/app/openapi.yaml b/services/nginx/app/openapi.yaml
index b29736ad..17065f33 100644
--- a/services/nginx/app/openapi.yaml
+++ b/services/nginx/app/openapi.yaml
@@ -11712,6 +11712,23 @@ paths:
               schema:
                 $ref: '#/components/schemas/SlackInternalDepartmentGoalProgressConfigResponse'
 
+  /slack/config/internal-department-goal-progress/test:
+    post:
+      tags: [Config]
+      summary: Test Slack internal department goal progress webhook
+      operationId: testSlackInternalDepartmentGoalProgressWebhook
+      responses:
+        '200':
+          description: Slack internal department goal progress webhook test completed successfully
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/SlackConfigTestResponse'
+        '400':
+          description: Slack internal department goal progress webhook URL is not configured
+        '502':
+          description: Slack internal department goal progress webhook test failed
+
   /backups/config:
     get:
       tags: [Config]
diff --git a/services/nginx/app/routes/moduleConfigRoute.php b/services/nginx/app/routes/moduleConfigRoute.php
index 8800507e..bb240b0a 100644
--- a/services/nginx/app/routes/moduleConfigRoute.php
+++ b/services/nginx/app/routes/moduleConfigRoute.php
@@ -250,6 +250,35 @@ class moduleConfigRoute
             ]
         );
 
+        /** Slack internal department goal progress config > TEST */
+        $this->post('/slack/config/internal-department-goal-progress/test', function () {
+            global $response;
+            $this->requirePermission('slack_config');
+            $user = (new authentication())->get_user();
+            if (!$user) {
+                (new logs_o())->add('slack_config', 'global', 1, 0, 'SLACK_INTERNAL_DEPARTMENT_GOAL_PROGRESS_CONFIG_TEST', 'No user found, or invalid session');
+                $response->error('Invalid session', 400);
+            }
+
+            $result = (new slack())->test_internal_department_goal_progress_webhook();
+            if (($result['configured'] ?? false) !== true) {
+                (new logs_o())->add('slack_config', 'global', 0, $user->id, 'SLACK_INTERNAL_DEPARTMENT_GOAL_PROGRESS_CONFIG_TEST', 'Slack internal department goal progress webhook URL is not configured');
+                $response->error($result['message'] ?? 'Slack internal department goal progress webhook URL is not configured.', 400);
+            }
+
+            if (($result['sent'] ?? false) !== true) {
+                (new logs_o())->add('slack_config', 'global', 0, $user->id, 'SLACK_INTERNAL_DEPARTMENT_GOAL_PROGRESS_CONFIG_TEST', 'Slack internal department goal progress test webhook failed');
+                $response->error($result['message'] ?? 'Slack test message failed.', 502);
+            }
+
+            (new logs_o())->add('slack_config', 'global', 1, $user->id, 'SLACK_INTERNAL_DEPARTMENT_GOAL_PROGRESS_CONFIG_TEST', 'Successfully tested Slack internal department goal progress webhook');
+            $response->success($result);
+        },
+            [
+                'slack_config' => 'Test Slack internal department goal progress config'
+            ]
+        );
+
         /** Slack internal department goal progress config > GET */
         $this->get('/slack/config/internal-department-goal-progress', function () {
             global $response;
diff --git a/services/nginx/app/tests/Unit/Slack/SlackConfigRouteWiringTest.php b/services/nginx/app/tests/Unit/Slack/SlackConfigRouteWiringTest.php
index 9e9260b0..93e071fd 100644
--- a/services/nginx/app/tests/Unit/Slack/SlackConfigRouteWiringTest.php
+++ b/services/nginx/app/tests/Unit/Slack/SlackConfigRouteWiringTest.php
@@ -8,10 +8,12 @@ it('registers Slack module config endpoints and customer registration webhook co
         ->and($routeContent)->toContain('/slack/config')
         ->and($routeContent)->toContain('/slack/config/test')
         ->and($routeContent)->toContain('/slack/config/internal-department-goal-progress')
+        ->and($routeContent)->toContain('/slack/config/internal-department-goal-progress/test')
         ->and($routeContent)->toContain("requirePermission('slack_config')")
         ->and($routeContent)->toContain("(new slack())->getConfig()->getConfigRequest()")
         ->and($routeContent)->toContain("(new slack())->getConfig()->postConfigRequest()")
         ->and($routeContent)->toContain("(new slack())->test_customer_registration_webhook()")
+        ->and($routeContent)->toContain("(new slack())->test_internal_department_goal_progress_webhook()")
         ->and($routeContent)->toContain("(new slack())->get_internal_department_goal_progress_config()")
         ->and($routeContent)->toContain("set_internal_department_goal_progress_config");
 
@@ -40,9 +42,11 @@ it('registers Slack module config endpoints and customer registration webhook co
         ->and($slackClassContent)->not->toBeFalse()
         ->and($slackClassContent)->toContain('send_customer_registration_notification')
         ->and($slackClassContent)->toContain('test_customer_registration_webhook')
+        ->and($slackClassContent)->toContain('test_internal_department_goal_progress_webhook')
         ->and($slackClassContent)->toContain('get_internal_department_goal_progress_config')
         ->and($slackClassContent)->toContain('get_internal_department_goal_progress_webhook_url')
         ->and($slackClassContent)->toContain('format_customer_registration_test')
+        ->and($slackClassContent)->toContain('format_internal_department_goal_progress_test')
         ->and($slackClassContent)->toContain('format_customer_registration')
         ->and($authRouteContent)->not->toBeFalse()
         ->and($authRouteContent)->toContain("AUTH_REGISTER_CVR_SLACK_NOTIFICATION_FAILED")
@@ -54,6 +58,7 @@ it('registers Slack module config endpoints and customer registration webhook co
         ->and($openApiContent)->toContain('/slack/config')
         ->and($openApiContent)->toContain('/slack/config/test')
         ->and($openApiContent)->toContain('/slack/config/internal-department-goal-progress')
+        ->and($openApiContent)->toContain('/slack/config/internal-department-goal-progress/test')
         ->and($openApiContent)->toContain('SlackConfigListResponse')
         ->and($openApiContent)->toContain('SlackInternalDepartmentGoalProgressConfigResponse')
         ->and($openApiContent)->toContain('SlackConfigTestResponse')
diff --git a/services/nginx/app/tests/Unit/Slack/SlackCustomerRegistrationWebhookTest.php b/services/nginx/app/tests/Unit/Slack/SlackCustomerRegistrationWebhookTest.php
index a61a43ce..7a67f6dd 100644
--- a/services/nginx/app/tests/Unit/Slack/SlackCustomerRegistrationWebhookTest.php
+++ b/services/nginx/app/tests/Unit/Slack/SlackCustomerRegistrationWebhookTest.php
@@ -10,7 +10,8 @@ final class SlackCustomerRegistrationWebhookFake extends slack
 
     public function __construct(
         private readonly string $webhook,
-        private readonly string $sendResult = 'Message sent successfully. Response: ok'
+        private readonly string $sendResult = 'Message sent successfully. Response: ok',
+        private readonly ?string $internalDepartmentGoalProgressWebhook = null
     ) {
         // Skip parent config loading for unit isolation.
     }
@@ -20,6 +21,11 @@ final class SlackCustomerRegistrationWebhookFake extends slack
         return $this->webhook;
     }
 
+    public function get_internal_department_goal_progress_webhook_url(): string
+    {
+        return $this->internalDepartmentGoalProgressWebhook ?? $this->webhook;
+    }
+
     public function send_webhook_message(string $message, string $webhook): string
     {
         $this->messages[] = [
@@ -84,3 +90,63 @@ it('reports customer registration test notification failures without exposing th
         ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->toContain('failed')
         ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->not->toContain('secret-token');
 });
+
+it('does not send internal department goal progress test notifications without a saved webhook', function (): void {
+    $slack = new SlackCustomerRegistrationWebhookFake(
+        'https://hooks.slack.test/services/customer-registration',
+        internalDepartmentGoalProgressWebhook: ''
+    );
+
+    $result = $slack->test_internal_department_goal_progress_webhook();
+
+    expect($result)
+        ->toBe([
+            'configured' => false,
+            'sent' => false,
+            'message' => 'Slack internal department goal progress webhook URL is not configured.',
+        ])
+        ->and($slack->messages)->toBe([]);
+});
+
+it('sends internal department goal progress test notifications to the saved webhook', function (): void {
+    $slack = new SlackCustomerRegistrationWebhookFake(
+        'https://hooks.slack.test/services/customer-registration',
+        internalDepartmentGoalProgressWebhook: 'https://hooks.slack.test/services/internal-goals-secret'
+    );
+
+    $result = $slack->test_internal_department_goal_progress_webhook();
+
+    expect($result)
+        ->toBe([
+            'configured' => true,
+            'sent' => true,
+            'message' => 'Slack test message sent successfully.',
+        ])
+        ->and($slack->messages)->toHaveCount(1)
+        ->and($slack->messages[0]['webhook'])->toBe('https://hooks.slack.test/services/internal-goals-secret')
+        ->and($slack->messages[0]['message'])->toContain('Truck Wash Slack test')
+        ->and($slack->messages[0]['message'])->toContain('Internal department goal progress notifications are configured correctly.')
+        ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->toContain('sent successfully')
+        ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->not->toContain('internal-goals-secret');
+});
+
+it('reports internal department goal progress test notification failures without exposing the webhook', function (): void {
+    $slack = new SlackCustomerRegistrationWebhookFake(
+        'https://hooks.slack.test/services/customer-registration',
+        'Failed to send message: cURL error for https://hooks.slack.test/services/internal-goals-secret',
+        'https://hooks.slack.test/services/internal-goals-secret'
+    );
+
+    $result = $slack->test_internal_department_goal_progress_webhook();
+
+    expect($result)
+        ->toBe([
+            'configured' => true,
+            'sent' => false,
+            'message' => 'Slack test message failed.',
+        ])
+        ->and($slack->messages)->toHaveCount(1)
+        ->and(json_encode($result, JSON_UNESCAPED_SLASHES))->not->toContain('internal-goals-secret')
+        ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->toContain('failed')
+        ->and(json_encode($slack->get_log(), JSON_UNESCAPED_SLASHES))->not->toContain('internal-goals-secret');
+});