diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 889b85c8..9eb082ae 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -10,6 +10,12 @@ module.exports = {
     'tsconfigRootDir': __dirname,
     'sourceType': 'module',
   },
+  'overrides': [{
+    'files': ['*.test.ts'],
+    'rules': {
+      '@typescript-eslint/no-magic-numbers': 'off'
+    }
+  }],
   'rules': {
     '@typescript-eslint/naming-convention': [
       'error',
diff --git a/.github/workflows/run-build-check.yml b/.github/workflows/run-build-check.yml
index bc7f98ae..09cb8332 100644
--- a/.github/workflows/run-build-check.yml
+++ b/.github/workflows/run-build-check.yml
@@ -29,5 +29,4 @@ jobs:
 
       - name: Build
         run: yarn build
-    
-    
+
diff --git a/.gitignore b/.gitignore
index f563cbda..dcd4666b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -139,3 +139,5 @@ dist
 .yarn/build-state.yml
 .yarn/install-state.gz
 .pnp.*
+
+*.code-workspace
\ No newline at end of file
diff --git a/src/presentation/http/router/auth.test.ts b/src/presentation/http/router/auth.test.ts
new file mode 100644
index 00000000..cb362465
--- /dev/null
+++ b/src/presentation/http/router/auth.test.ts
@@ -0,0 +1,66 @@
+import { describe, test, expect } from 'vitest';
+
+describe('Auth API', () => {
+  describe('POST /auth', () => {
+    test('Returns 401 when refresh token in not valid', async () => {
+      const refreshToken = 'EF1JX65xSZ';
+
+      const response = await global.api?.fakeRequest({
+        method: 'POST',
+        url: '/auth',
+        body: { token: refreshToken },
+      });
+
+      expect(response?.statusCode).toBe(401);
+
+      const body = await response?.json();
+
+      expect(body).toStrictEqual({ message: 'Session is not valid' });
+    });
+
+    test('Returns 200 when refresh token is valid and expiration date has not passed', async () => {
+      const refreshToken = 'pv-jIqfPj2';
+
+      /**
+       * Insert session data to the DB with tomorrow expiration date
+       */
+      await global.db.query(`INSERT INTO public.user_sessions (id, "user_id", "refresh_token", "refresh_token_expires_at") VALUES (9999, 1, '${refreshToken}', CURRENT_DATE + INTERVAL '1 day')`);
+
+      const response = await global.api?.fakeRequest({
+        method: 'POST',
+        url: '/auth',
+        body: { token: refreshToken },
+      });
+
+      expect(response?.statusCode).toBe(200);
+
+      const body = await response?.json();
+
+      expect(typeof body.refreshToken).toBe('string');
+      expect(body.refreshToken).toBeDefined();
+      expect(body.refreshToken).not.toBeNull();
+      expect(body.refreshToken).not.toBe('');
+
+      expect(typeof body.accessToken).toBe('string');
+      expect(body.accessToken).toBeDefined();
+      expect(body.accessToken).not.toBeNull();
+      expect(body.accessToken).not.toBe('');
+    });
+
+    test('Returns 401 when expiration day has passed', async () => {
+      const outdatedToken = 'F5tTF24K9Q';
+
+      const response = await global.api?.fakeRequest({
+        method: 'POST',
+        url: '/auth',
+        body:{ token: outdatedToken },
+      });
+
+      expect (response?.statusCode).toBe(401);
+
+      const body = await response?.json();
+
+      expect(body).toStrictEqual({ message:'Session is not valid' });
+    });
+  });
+});
diff --git a/src/tests/test-data/user-sessions.json b/src/tests/test-data/user-sessions.json
index a9d26410..6eac4761 100644
--- a/src/tests/test-data/user-sessions.json
+++ b/src/tests/test-data/user-sessions.json
@@ -1,8 +1,14 @@
 [
   {
-    "id" : 1,
-    "user_id" : 4,
-    "refresh_token" : "IqrTkSKmel",
-    "refresh_token_expires_at" : "2025-11-21 19:19:40.911+03"
+    "id": 2,
+    "user_id": 4,
+    "refresh_token": "F5tTF24K9Q",
+    "refresh_token_expires_at": "2023-11-09 11:23:54+02"
+  },
+  {
+    "id": 3,
+    "user_id": 1,
+    "refresh_token": "IqrTkSKmel",
+    "refresh_token_expires_at": "2025-11-21 19:19:40.911+03"
   }
 ]
diff --git a/src/tests/utils/insert-data.ts b/src/tests/utils/insert-data.ts
index a322a00b..149991a4 100644
--- a/src/tests/utils/insert-data.ts
+++ b/src/tests/utils/insert-data.ts
@@ -4,6 +4,7 @@ import userSessions from '../test-data/user-sessions.json';
 import notes from '../test-data/notes.json';
 import noteSettings from '../test-data/notes-settings.json';
 
+
 /**
  * Fills in the database with users data
  *
@@ -26,7 +27,7 @@ async function insertUserSessions(db: SequelizeOrm): Promise<void> {
   }
 }
 /**
- * Fills in the database with notes datas
+ * Fills in the database with notes data
  *
  * @param db - SequelizeOrm instance
  */
diff --git a/src/tests/utils/setup.ts b/src/tests/utils/setup.ts
index 0e5644b1..66226af3 100644
--- a/src/tests/utils/setup.ts
+++ b/src/tests/utils/setup.ts
@@ -33,7 +33,7 @@ declare global {
    * @param userId - id of the user that will be considered the author of the request
    * @returns accessToken for authorization
    */
-  function auth(userId: number) : string;
+  function auth(userId: number): string;
 
   /* eslint-disable-next-line no-var */
   var db: {
@@ -42,7 +42,6 @@ declare global {
      * Might be used in tests to perform some specific database operations
      *
      * @param sql - string containing sql to executein test DB
-     * @returns
      */
     query: (sql: string) => Promise<unknown>;
   };