diff --git a/tests/app/conftest.py b/tests/app/conftest.py
new file mode 100644
index 0000000..18cc99d
--- /dev/null
+++ b/tests/app/conftest.py
@@ -0,0 +1,12 @@
+import pytest
+
+from pytest_mock import MockerFixture
+
+
+@pytest.fixture(autouse=True)
+def setup(mocker: MockerFixture):
+    mocked_engine = mocker.patch("sqlalchemy.ext.asyncio.create_async_engine")
+    MockedEngine = mocker.patch("sqlalchemy.ext.asyncio.AsyncEngine")
+    mocked_engine.return_value = MockedEngine.return_value
+    mocker.patch("fastapi.security.OAuth2AuthorizationCodeBearer")
+    mocker.patch("entities.engine.get_session")
diff --git a/tests/app/test_dependencies.py b/tests/app/test_dependencies.py
new file mode 100644
index 0000000..49c3d39
--- /dev/null
+++ b/tests/app/test_dependencies.py
@@ -0,0 +1,32 @@
+from unittest.mock import Mock
+from pytest_mock import MockerFixture
+from sqlalchemy.ext.asyncio import AsyncSession
+
+import pytest
+
+
+@pytest.fixture
+def mock_session(mocker: MockerFixture) -> AsyncSession:
+    return mocker.patch("sqlalchemy.ext.asyncio.AsyncSession").return_value
+
+
+async def test_domain_denied(mocker: MockerFixture, mock_session: AsyncSession):
+    domain_allowed_mock = mocker.patch("entities.repos.institutions_repo.is_domain_allowed")
+    domain_allowed_mock.return_value = False
+    from dependencies import email_domain_denied
+
+    denied_domain = "denied.domain"
+
+    assert await email_domain_denied(mock_session, denied_domain) is True
+    domain_allowed_mock.assert_called_once_with(mock_session, denied_domain)
+
+
+async def test_domain_allowed(mocker: MockerFixture, mock_session: AsyncSession):
+    domain_allowed_mock = mocker.patch("entities.repos.institutions_repo.is_domain_allowed")
+    domain_allowed_mock.return_value = True
+    from dependencies import email_domain_denied
+
+    denied_domain = "allowed.domain"
+
+    assert await email_domain_denied(mock_session, denied_domain) is False
+    domain_allowed_mock.assert_called_once_with(mock_session, denied_domain)