diff --git a/billing/tests.py b/billing/tests.py
index 7ce503c..7be55fe 100644
--- a/billing/tests.py
+++ b/billing/tests.py
@@ -1,3 +1,192 @@
 from django.test import TestCase
+from django.urls import reverse
+from rest_framework import status
+from rest_framework.test import APIClient
+from django.contrib.auth import get_user_model
+from .models import Topup
+from .serializers import TopupSerializer
+from django.utils import timezone
+from datetime import timedelta
+from decouple import config
+from unittest import mock
 
-# Create your tests here.
+User = get_user_model()
+
+REAL_USER_FIRST_NAME = config("REAL_USER_FIRST_NAME", default="josh")
+REAL_USER_LAST_NAME = config("REAL_USER_LAST_NAME", default="mosh")
+
+
+class TopupTests(TestCase):
+    def setUp(self):
+        self.client = APIClient()
+        self.real_user = User.objects.create_user(
+            username="testuser",
+            password="testpassword",
+            first_name=REAL_USER_FIRST_NAME,
+            last_name=REAL_USER_LAST_NAME,
+            acc_no="7770000010629",
+            is_admin=True,
+        )
+        self.user = User.objects.create_user(
+            username="plskillme",
+            password="modewasgayithink",
+            first_name="mode",
+            last_name="hussain",
+            acc_no="1122334455",
+        )
+        self.admin_user = User.objects.create_superuser(
+            username="adminuser",
+            password="adminpassword",
+            email="admin@example.com",
+            first_name="Admin",
+            last_name="User",
+            acc_no="987654321",
+        )
+        self.client.force_authenticate(user=self.real_user)
+
+    def test_create_topup(self):
+        url = reverse("create-list-topups")
+        data = {"amount": 100.00}
+        response = self.client.post(url, data, format="json")
+        self.assertEqual(response.status_code, status.HTTP_201_CREATED)
+        self.assertEqual(Topup.objects.count(), 1)
+        topup = Topup.objects.first()
+        self.assertEqual(getattr(topup, "amount"), 100.00)
+        self.assertEqual(getattr(topup, "user"), self.real_user)
+
+    def test_create_topup_no_amount(self):
+        url = reverse("create-list-topups")
+        data = {}
+        response = self.client.post(url, data, format="json")
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+
+    def test_list_topups(self):
+        Topup.objects.create(amount=50.00, user=self.real_user)
+        Topup.objects.create(amount=75.00, user=self.real_user)
+        url = reverse("create-list-topups")
+        response = self.client.get(url, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 2)
+
+    def test_list_topups_admin(self):
+        self.client = APIClient()
+        self.client.force_authenticate(user=self.admin_user)
+        Topup.objects.create(amount=50.00, user=self.real_user)
+        admin_user = User.objects.create_user(
+            username="anotheruser",
+            password="testpassword",
+            first_name="Another",
+            last_name="User",
+            acc_no="1122334455",
+            is_admin=True,
+        )
+        Topup.objects.create(amount=75.00, user=admin_user)
+        url = reverse("create-list-topups")
+        response = self.client.get(url, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 2)  # Admin sees all
+
+    def test_list_topups_filtered_by_user(self):
+        other_user = User.objects.create_user(
+            username="otheruser",
+            password="testpassword",
+            first_name="Other",
+            last_name="User",
+            acc_no="5544332211",
+        )
+        Topup.objects.create(amount=50.00, user=self.user)
+        Topup.objects.create(amount=75.00, user=other_user)
+        url = reverse("create-list-topups")
+        response = self.client.get(url, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 2)
+
+    @mock.patch("billing.views.localtime")
+    def test_verify_topup_payment(self, mock_localtime):
+        fixed_time = timezone.datetime(
+            2025, 7, 3, 19, 36, tzinfo=timezone.get_current_timezone()
+        )
+        mock_localtime.return_value = fixed_time
+
+        topup = Topup.objects.create(amount=1.5, user=self.real_user)
+        url = reverse("verify-topup-payment", kwargs={"pk": topup.pk})
+        self.client = APIClient()
+
+        self.client.force_authenticate(user=self.real_user)
+        data = {
+            "benefName": f"{REAL_USER_FIRST_NAME} {REAL_USER_LAST_NAME}",
+            "accountNo": "7770000010629",
+            "absAmount": 1.5,
+            "time": fixed_time.strftime("%Y-%m-%d %H:%M"),  # Use the same fixed time
+        }
+        response = self.client.patch(url, data, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        topup.refresh_from_db()
+        self.assertEqual(topup.paid, True)
+
+    def test_verify_topup_payment_already_verified(self):
+        topup = Topup.objects.create(amount=100.00, user=self.real_user, paid=True)
+        url = reverse("verify-topup-payment", kwargs={"pk": topup.pk})
+        data = {}
+        response = self.client.patch(url, data, format="json")
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+
+    def test_verify_topup_payment_unauthorized(self):
+        other_user = User.objects.create_user(
+            username="otheruser",
+            password="testpassword",
+            first_name="Other",
+            last_name="User",
+            acc_no="5544332211",
+        )
+        topup = Topup.objects.create(amount=100.00, user=other_user)
+        url = reverse("verify-topup-payment", kwargs={"pk": topup.pk})
+        data = {}
+        response = self.client.patch(url, data, format="json")
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
+
+    def test_topup_serializer(self):
+        topup = Topup.objects.create(amount=120.00, user=self.real_user)
+        serializer = TopupSerializer(topup)
+        self.assertEqual(serializer.data["amount"], 120.00)
+        self.assertEqual(serializer.data["user"]["id"], getattr(self.real_user, "id"))
+
+    def test_topup_filter_amount(self):
+        Topup.objects.create(amount=50.00, user=self.real_user)
+        Topup.objects.create(amount=100.00, user=self.real_user)
+        url = reverse("create-list-topups") + "?amount_min=75"
+        response = self.client.get(url, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 1)
+        self.assertEqual(response.json()["data"][0]["amount"], 100.00)
+
+    def test_topup_filter_user_search(self):
+        Topup.objects.create(amount=50.00, user=self.real_user)
+        other_user = User.objects.create_user(
+            username="otheruser",
+            password="testpassword",
+            first_name="Other",
+            last_name="User",
+            id_card="12345",
+            mobile="1234567890",
+            acc_no="5544332211",
+        )
+        Topup.objects.create(amount=75.00, user=other_user)
+        url = reverse("create-list-topups") + "?user=Other"
+        response = self.client.get(url, format="json")
+        print(response.json())
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 1)
+        self.assertEqual(response.json()["data"][0]["amount"], 75.00)
+
+    def test_topup_filter_created_at(self):
+        now = timezone.now()
+        Topup.objects.create(
+            amount=50.00, user=self.real_user, created_at=now - timedelta(days=2)
+        )
+        Topup.objects.create(amount=100.00, user=self.real_user, created_at=now)
+        url = reverse("create-list-topups") + f"?created_at_after={now.date()}"
+        response = self.client.get(url, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(len(response.json()["data"]), 1)
+        self.assertEqual(response.json()["data"][0]["amount"], 100.00)
diff --git a/justfile b/justfile
index bc25798..025916d 100644
--- a/justfile
+++ b/justfile
@@ -7,6 +7,14 @@ dev:
 
 migrate:
   python manage.py migrate
-
 make-migrations:
-  python manage.py makemigrations
\ No newline at end of file
+  python manage.py makemigrations
+
+seed-topups:
+  python manage.py seed_topups --number=50
+seed-payments:
+  python manage.py seed_payments --number=50
+
+# TESTS
+test-billing:
+  python manage.py test billing
\ No newline at end of file