diff --git a/dspace/settings_test.py b/dspace/settings_test.py
new file mode 100644
index 0000000..987940d
--- /dev/null
+++ b/dspace/settings_test.py
@@ -0,0 +1,13 @@
+"""Настройки для тестов: боевой режим (DEBUG=False), но без SSL-редиректа и внешних сервисов."""
+import os
+
+os.environ.setdefault('DJANGO_SECRET_KEY', 'test-secret-key-not-for-production')
+os.environ.setdefault('DJANGO_DEBUG', 'False')
+os.environ.setdefault('DJANGO_SECURE_SSL_REDIRECT', 'False')
+os.environ.setdefault('DJANGO_ALLOWED_HOSTS', 'testserver,localhost')
+
+from .settings import *  # noqa: E402,F403
+
+STATICFILES_STORAGE = 'django.contrib.staticfiles.storage.StaticFilesStorage'
+PASSWORD_HASHERS = ['django.contrib.auth.hashers.MD5PasswordHasher']
+EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
diff --git a/main/tests.py b/main/tests.py
deleted file mode 100644
index 4929020..0000000
--- a/main/tests.py
+++ /dev/null
@@ -1,2 +0,0 @@
-
-# Create your tests here.
diff --git a/main/tests/__init__.py b/main/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/main/tests/conftest.py b/main/tests/conftest.py
new file mode 100644
index 0000000..2fd3570
--- /dev/null
+++ b/main/tests/conftest.py
@@ -0,0 +1,22 @@
+import pytest
+
+from main.models import Article, SiteSettings
+
+
+@pytest.fixture(autouse=True)
+def no_network(monkeypatch):
+    """Никаких реальных запросов наружу: ping поисковиков и т. п."""
+    calls = []
+    monkeypatch.setattr('main.signals.requests.get', lambda *a, **kw: calls.append((a, kw)))
+    monkeypatch.setattr('main.signals.requests.post', lambda *a, **kw: calls.append((a, kw)))
+    return calls
+
+
+@pytest.fixture
+def article(db):
+    return Article.objects.create(title='Первая статья', post='Текст статьи', excerpt='Кратко')
+
+
+@pytest.fixture
+def site_settings(db):
+    return SiteSettings.load()
diff --git a/main/tests/test_pages.py b/main/tests/test_pages.py
new file mode 100644
index 0000000..659085d
--- /dev/null
+++ b/main/tests/test_pages.py
@@ -0,0 +1,46 @@
+import pytest
+from django.urls import reverse
+
+from main.models import ArticleView
+
+UA = 'Mozilla/5.0 (X11; Linux x86_64) Firefox/131.0'
+
+
+@pytest.mark.django_db
+@pytest.mark.parametrize('name', ['index', 'about', 'projects', 'achievements', 'contacts', 'blog'])
+def test_page_opens(client, name):
+    assert client.get(reverse(name), HTTP_USER_AGENT=UA).status_code == 200
+
+
+@pytest.mark.django_db
+def test_sitemap_and_robots(client, article):
+    assert client.get('/sitemap.xml').status_code == 200
+
+
+@pytest.mark.django_db
+def test_article_counts_unique_views(client, article):
+    url = article.get_absolute_url()
+    client.get(url, HTTP_USER_AGENT=UA)
+    client.get(url, HTTP_USER_AGENT=UA)
+    article.refresh_from_db()
+    assert article.views == 2
+    assert ArticleView.objects.filter(article=article).count() == 1
+
+
+@pytest.mark.django_db
+def test_bots_do_not_create_unique_views(client, article):
+    client.get(article.get_absolute_url(), HTTP_USER_AGENT='Googlebot/2.1')
+    assert not ArticleView.objects.exists()
+
+
+@pytest.mark.django_db
+def test_visitor_cookie_is_signed_and_httponly(client):
+    response = client.get(reverse('index'), HTTP_USER_AGENT=UA)
+    cookie = response.cookies['dspace_vid']
+    assert cookie['httponly']
+    assert ':' in cookie.value
+
+
+@pytest.mark.django_db
+def test_unknown_page_returns_404(client):
+    assert client.get('/no-such-page/', HTTP_USER_AGENT=UA).status_code == 404
diff --git a/main/tests/test_security.py b/main/tests/test_security.py
new file mode 100644
index 0000000..9fef6a3
--- /dev/null
+++ b/main/tests/test_security.py
@@ -0,0 +1,73 @@
+from unittest import mock
+
+import pytest
+
+from main.forms import CommentForm, ContactForm
+from main.middleware import client_ip_hash, is_bot
+from main.models import is_public_http_url
+from main.signals import build_telegram_text
+from main.templatetags.custom_filters import render_tech_badge
+
+
+def test_comment_form_strips_scripts_and_keeps_allowed_tags():
+    form = CommentForm(data={'content': '<script>alert(1)</script><b>жирный</b> https://example.com'})
+    assert form.is_valid()
+    content = form.cleaned_data['content']
+    assert '<script>' not in content
+    assert '<b>жирный</b>' in content
+    assert '<a href="https://example.com"' in content
+
+
+def test_contact_form_removes_all_html():
+    data = {'name': 'Иван', 'email': 'ivan@example.com', 'subject': 'Вопрос',
+            'message': '<img src=x onerror=alert(1)>Привет', 'captcha': 'token'}
+    with mock.patch('main.forms.SmartCaptchaField._verify_captcha', return_value=True):
+        form = ContactForm(data=data)
+        assert form.is_valid(), form.errors
+    assert form.cleaned_data['message'] == 'Привет'
+
+
+def test_contact_form_rejects_failed_captcha():
+    data = {'name': 'Бот', 'email': 'bot@example.com', 'subject': 'Спам', 'message': 'Спам', 'captcha': 'bad'}
+    with mock.patch('main.forms.SmartCaptchaField._verify_captcha', return_value=False):
+        assert not ContactForm(data=data).is_valid()
+
+
+def test_tech_badge_escapes_name():
+    html = render_tech_badge('<script>x</script>')
+    assert '<script>' not in html
+    assert '&lt;script&gt;' in html
+
+
+def test_telegram_text_is_html_escaped(db):
+    from main.models import Article
+
+    article = Article(title='C++ & <Rust>', slug='cpp', post='...', excerpt='a < b')
+    text = build_telegram_text(article)
+    assert '<b>C++ &amp; &lt;Rust&gt;</b>' in text
+    assert 'a &lt; b' in text
+    assert '\\' not in text
+
+
+@pytest.mark.parametrize('url', ['file:///etc/passwd', 'ftp://example.com', 'http://localhost/', 'http://10.0.0.1/'])
+def test_preview_rejects_non_public_urls(url):
+    assert not is_public_http_url(url)
+
+
+def test_preview_accepts_public_url():
+    public = [(2, 1, 6, '', ('93.184.215.14', 443))]
+    with mock.patch('main.models.socket.getaddrinfo', return_value=public):
+        assert is_public_http_url('https://example.com/page')
+
+
+def test_ip_hash_is_empty_for_private_addresses(rf):
+    assert client_ip_hash(rf.get('/', REMOTE_ADDR='192.168.1.10')) == ''
+    assert client_ip_hash(rf.get('/', REMOTE_ADDR='93.184.215.14'))
+
+
+@pytest.mark.parametrize(('ua', 'expected'), [
+    ('', True), ('Googlebot/2.1', True), ('python-requests/2.32', True),
+    ('Mozilla/5.0 (Windows NT 10.0) Chrome/129.0', False),
+])
+def test_bot_detection(rf, ua, expected):
+    assert is_bot(rf.get('/', HTTP_USER_AGENT=ua)) is expected
diff --git a/main/tests/test_votes.py b/main/tests/test_votes.py
new file mode 100644
index 0000000..763a4d4
--- /dev/null
+++ b/main/tests/test_votes.py
@@ -0,0 +1,71 @@
+import json
+
+import pytest
+from django.urls import reverse
+
+from main.models import ArticleLike
+
+PUBLIC_IP = '93.184.215.14'
+UA = 'Mozilla/5.0 (X11; Linux x86_64) Firefox/131.0'
+
+
+def vote(client, article, is_like=True, ip=PUBLIC_IP):
+    return client.post(
+        reverse('toggle_article_like', args=[article.id]),
+        data=json.dumps({'is_like': is_like}),
+        content_type='application/json',
+        REMOTE_ADDR=ip,
+        HTTP_USER_AGENT=UA,
+    )
+
+
+@pytest.mark.django_db
+def test_anonymous_like_is_counted(client, article):
+    response = vote(client, article)
+    assert response.status_code == 200
+    assert response.json() == {'success': True, 'likes': 1, 'dislikes': 0, 'user_vote': True}
+    assert ArticleLike.objects.get().visitor_id
+
+
+@pytest.mark.django_db
+def test_second_click_removes_vote(client, article):
+    vote(client, article)
+    response = vote(client, article)
+    assert response.json()['user_vote'] is None
+    assert ArticleLike.objects.count() == 0
+
+
+@pytest.mark.django_db
+def test_like_switches_to_dislike(client, article):
+    vote(client, article, is_like=True)
+    response = vote(client, article, is_like=False)
+    assert response.json()['likes'] == 0
+    assert response.json()['dislikes'] == 1
+    assert ArticleLike.objects.count() == 1
+
+
+@pytest.mark.django_db
+def test_votes_per_ip_are_limited(client_factory, article):
+    statuses = [vote(client_factory(), article).status_code for _ in range(3)]
+    assert statuses == [200, 200, 429]
+
+
+@pytest.mark.django_db
+def test_private_ip_is_not_limited(client_factory, article):
+    statuses = [vote(client_factory(), article, ip='10.0.0.5').status_code for _ in range(3)]
+    assert statuses == [200, 200, 200]
+
+
+@pytest.mark.django_db
+def test_invalid_json_returns_400(client, article):
+    response = client.post(
+        reverse('toggle_article_like', args=[article.id]), data='not json', content_type='application/json'
+    )
+    assert response.status_code == 400
+
+
+@pytest.fixture
+def client_factory():
+    from django.test import Client
+
+    return Client
diff --git a/pyproject.toml b/pyproject.toml
index 8228014..7c45b1c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,5 +16,5 @@ ignore = [
 "main/management/commands/*" = ["S311"]
 
 [tool.pytest.ini_options]
-DJANGO_SETTINGS_MODULE = "dspace.settings"
+DJANGO_SETTINGS_MODULE = "dspace.settings_test"
 python_files = ["test_*.py"]