diff --git a/test/Cases/UserTest.php b/test/Cases/UserTest.php
new file mode 100644
index 0000000..ff17bb0
--- /dev/null
+++ b/test/Cases/UserTest.php
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  group@hyperf.io
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+
+namespace HyperfTest\Cases;
+
+use Hyperf\Testing\TestCase;
+
+/**
+ * @internal
+ * @coversNothing
+ */
+class UserTest extends TestCase
+{
+    public function testAddValidUser()
+    {
+        $user = [
+            'name' => 'John Doe',
+            'email' => 'john@example.com',
+            'password' => 'Password1@',
+        ];
+        $response = $this->post('/users', $user);
+
+        $this->assertSame(201, $response->getStatusCode());
+        $responseContent = $response->toArray();
+        $this->assertArrayHasKey('id', $responseContent);
+        unset($responseContent['id']);
+        $this->assertSame($user, $responseContent);
+    }
+
+    public function testAddDuplicateUser()
+    {
+        $user = [
+            'name' => 'John Doe',
+            'email' => 'john@example.com',
+            'password' => 'Password1@',
+        ];
+        $response = $this->post('/users', $user);
+
+        $this->assertSame(409, $response->getStatusCode());
+        $responseContent = $response->toArray();
+        $this->assertSame('User already exists.', $responseContent['message']);
+    }
+
+    public function testAddUserInvalidEmail()
+    {
+        $user = [
+            'name' => 'John Doe',
+            'email' => 'johnexample.com',
+            'password' => 'Password1@',
+        ];
+        $response = $this->post('/users', $user);
+
+        $this->assertSame(400, $response->getStatusCode());
+        $responseContent = $response->toArray();
+        $this->assertSame('Invalid email address.', $responseContent['message']);
+    }
+
+    public function testAddUserInvalidPassword()
+    {
+        $user = [
+            'name' => 'John Doe',
+            'email' => 'john@example.com',
+            'password' => 'password',
+        ];
+        $response = $this->post('/users', $user);
+
+        $this->assertSame(400, $response->getStatusCode());
+        $responseContent = $response->toArray();
+        $this->assertSame('Password must contain at least one uppercase letter, one lowercase letter, one number and one special character.', $responseContent['message']);
+    }
+
+    public function testAddUserInvalidName()
+    {
+        $user = [
+            'name' => 'J1',
+            'email' => 'john@example.com',
+            'password' => 'Password1@',
+        ];
+        $response = $this->post('/users', $user);
+
+        $this->assertSame(400, $response->getStatusCode());
+        $responseContent = $response->toArray();
+        $this->assertSame('Name must have at least two characters and cannot contain numbers.', $responseContent['message']);
+    }
+}