Refactoring code for modular approach

tests/test_auth.py

@@ -23,7 +23,7 @@ class TestAuthenticationAPI:
     def test_register_user_duplicate_email(self, client, test_user):
         """Test registration with duplicate email"""
         response = client.post("/api/v1/auth/register", json={
-            "email": "test@example.com",  # Same as test_user
+            "email": test_user.email,  # Same as test_user
             "username": "newuser",
             "password": "securepass123"
         })
@@ -35,7 +35,7 @@ class TestAuthenticationAPI:
         """Test registration with duplicate username"""
         response = client.post("/api/v1/auth/register", json={
             "email": "new@example.com",
-            "username": "testuser",  # Same as test_user
+            "username": test_user.username,  # Same as test_user
             "password": "securepass123"
         })
 
@@ -45,7 +45,7 @@ class TestAuthenticationAPI:
     def test_login_success(self, client, test_user):
         """Test successful login"""
         response = client.post("/api/v1/auth/login", json={
-            "username": "testuser",
+            "username": test_user.username,
             "password": "testpass123"
         })
 
@@ -54,7 +54,7 @@ class TestAuthenticationAPI:
         assert "access_token" in data
         assert data["token_type"] == "bearer"
         assert "expires_in" in data
-        assert data["user"]["username"] == "testuser"
+        assert data["user"]["username"] == test_user.username
 
     def test_login_wrong_password(self, client, test_user):
         """Test login with wrong password"""
@@ -75,14 +75,14 @@ class TestAuthenticationAPI:
 
         assert response.status_code == 401
 
-    def test_get_current_user_info(self, client, auth_headers):
+    def test_get_current_user_info(self, client, auth_headers, test_user):
         """Test getting current user info"""
         response = client.get("/api/v1/auth/me", headers=auth_headers)
 
         assert response.status_code == 200
         data = response.json()
-        assert data["username"] == "testuser"
-        assert data["email"] == "test@example.com"
+        assert data["username"] == test_user.username
+        assert data["email"] == test_user.email
 
     def test_get_current_user_no_auth(self, client):
         """Test getting current user without authentication"""