diff --git a/demo/myapp/serializers.py b/demo/myapp/serializers.py
index 051f9c6..cfd9d8b 100644
--- a/demo/myapp/serializers.py
+++ b/demo/myapp/serializers.py
@@ -7,7 +7,7 @@ from rest_framework import exceptions
 # noinspection PyAbstractClass
 class RestAuthAxesLoginSerializer(LoginSerializer):
 
-    def validate(self, attrs):
+    def validate(self, attrs) -> dict:
         try:
             return super().validate(attrs)
         except exceptions.ValidationError as e:
diff --git a/demo/myapp/tests.py b/demo/myapp/tests.py
deleted file mode 100644
index 7ce503c..0000000
--- a/demo/myapp/tests.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from django.test import TestCase
-
-# Create your tests here.
diff --git a/demo/myapp/tests/test_serializers.py b/demo/myapp/tests/test_serializers.py
new file mode 100644
index 0000000..2402688
--- /dev/null
+++ b/demo/myapp/tests/test_serializers.py
@@ -0,0 +1,71 @@
+from django.conf import settings
+from django.contrib.auth.models import User
+from django.http import HttpRequest
+from django.test import TestCase
+from rest_framework.exceptions import ValidationError
+
+from myapp import serializers
+
+
+class TestRestAuthAxesLoginSerializer(TestCase):
+
+    def setUp(self) -> None:
+        self.request = HttpRequest()
+
+    def test_validate_wrong_user(self) -> None:
+        serializer = serializers.RestAuthAxesLoginSerializer(
+            context=dict(request=self.request)
+        )
+        with self.assertRaisesMessage(ValidationError, 'Unable to log in with provided credentials.'):
+            serializer.validate({
+                'username': 'test',
+                'email': 'test@example.com',
+                'password': 'test'
+            })
+
+    def test_validate_good_user(self) -> None:
+        User.objects.create_user(
+            username='test',
+            email='test@example.com',
+            password='test'
+        )
+        serializer = serializers.RestAuthAxesLoginSerializer(
+            context=dict(request=self.request)
+        )
+        attrs = serializer.validate({
+            'username': 'test',
+            'email': 'test@example.com',
+            'password': 'test'
+        })
+
+        self.assertIsNotNone(attrs)
+
+    def test_validate_axes_locked_out(self) -> None:
+        good_password_creds = {
+            'username': 'test',
+            'email': 'test@example.com',
+            'password': 'good_password'
+        }
+
+        bad_password_creds = {
+            'username': 'test',
+            'email': 'test@example.com',
+            'password': 'bad_password'
+        }
+
+        User.objects.create_user(**good_password_creds)
+        serializer = serializers.RestAuthAxesLoginSerializer(
+            context=dict(request=self.request)
+        )
+
+        for i in range(settings.AXES_FAILURE_LIMIT - 1):
+            with self.assertRaisesMessage(ValidationError, 'Unable to log in with provided credentials.'):
+                serializer.validate(bad_password_creds)
+
+        account_locked_message = 'Account locked: too many login attempts. Contact an admin to unlock your account.'
+
+        with self.assertRaisesMessage(ValidationError, account_locked_message):
+            serializer.validate(bad_password_creds)
+
+        with self.assertRaisesMessage(ValidationError, account_locked_message):
+            serializer.validate(good_password_creds)