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from unittest.mock import patch
from django.db import DatabaseError, IntegrityError
from django.db.models import Model
from django.test import TestCase
from health_check.db.backends import DatabaseBackend
from health_check.mixins import CheckMixin
class MockDBModel(Model):
"""
A Mock database used for testing.
error_thrown - The Exception to be raised when save() is called, if any.
"""
error_thrown = None
def __init__(self, error_thrown=None, *args, **kwargs):
super().__init__(*args, **kwargs)
self.error_thrown = error_thrown
def save(self, *args, **kwargs):
if self.error_thrown is not None:
raise self.error_thrown
else:
return True
def delete(self, *args, **kwargs):
return True
def raise_(ex):
raise ex
class HealthCheckDatabaseTests(TestCase):
"""
Tests health check behavior with a mocked database backend.
Ensures check_status returns/raises the expected result when the database works or raises exceptions.
"""
@patch(
"health_check.db.backends.TestModel.objects.create",
lambda title=None: MockDBModel(),
)
def test_check_status_works(self):
db_backend = DatabaseBackend()
db_backend.check_status()
self.assertFalse(db_backend.errors)
@patch(
"health_check.db.backends.TestModel.objects.create",
lambda title=None: raise_(IntegrityError),
)
def test_raise_integrity_error(self):
db_backend = DatabaseBackend()
db_backend.run_check()
self.assertTrue(db_backend.errors)
self.assertIn("unexpected result: Integrity Error", db_backend.pretty_status())
@patch(
"health_check.db.backends.TestModel.objects.create",
lambda title=None: MockDBModel(error_thrown=DatabaseError),
)
def test_raise_database_error(self):
db_backend = DatabaseBackend()
db_backend.run_check()
self.assertTrue(db_backend.errors)
self.assertIn("unavailable: Database error", db_backend.pretty_status())
@patch(
"health_check.db.backends.TestModel.objects.create",
lambda title=None: MockDBModel(error_thrown=Exception),
)
def test_raise_exception(self):
db_backend = DatabaseBackend()
with self.assertRaises(Exception):
db_backend.run_check()
class MultipleDatabasesTests(TestCase):
"""Ensures all databases are registered as their own backend and each backend runs in its own database."""
def test_all_databases_registered(self):
check_mixin = CheckMixin()
all_plugins = check_mixin.plugins
self.assertIn("DatabaseBackend[default]", all_plugins)
self.assertIn("DatabaseBackend[other]", all_plugins)
@patch("django.db.transaction.atomic")
def test_checks_on_database(self, mocked_atomic):
db1_health_check = DatabaseBackend(database_name="other")
db1_health_check.run_check()
mocked_atomic.assert_called_with(using="other")
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