Basic testing infrastructure

app/lib/settings.py

@@ -91,6 +91,7 @@ class TestingSettings(BaseEnvSettings):
 
     DB_HOST: str = "localhost"
     DB_PORT: int = 5432
+    DB_TEMPLATE_NAME: str = "db-template-name"
     DB_NAME: str = "test_db-name"
     DB_USER: str = "db-user"
     DB_PASSWORD: str = "db-password"

app/lib/sqlalchemy_plugin.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from dataclasses import dataclass
 from typing import TYPE_CHECKING, cast
 from uuid import UUID
 
@@ -13,7 +14,12 @@ from litestar.contrib.sqlalchemy.plugins.init.config.common import (
 )
 from litestar.utils import delete_litestar_scope_state, get_litestar_scope_state
 from sqlalchemy import event
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import (
+    AsyncEngine,
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
 from sqlalchemy.pool import NullPool
 
 from app.lib import settings
@@ -37,16 +43,25 @@ def _default(val: Any) -> str:
     raise TypeError()
 
 
+@dataclass
+class DBConnectionSettings:
+    username: str
+    password: str
+    host: str
+    port: int
+    database: str
+
+
+def create_db_engine(connection_settings: DBConnectionSettings) -> AsyncEngine:
     db_connection_url = sqlalchemy.engine.URL.create(
         drivername="postgresql+asyncpg",
-    username=settings.db.USER,
+        username=connection_settings.username,
-    password=settings.db.PASSWORD,
+        password=connection_settings.password,
-    host=settings.db.HOST,
+        host=connection_settings.host,
-    port=settings.db.PORT,
+        port=connection_settings.port,
-    database=settings.db.NAME,
+        database=connection_settings.database,
     )
-
+    return create_async_engine(
-engine = create_async_engine(
         db_connection_url,
         echo=settings.db.ECHO,
         echo_pool=settings.db.ECHO_POOL,
@@ -56,6 +71,19 @@ engine = create_async_engine(
         pool_timeout=settings.db.POOL_TIMEOUT,
         poolclass=NullPool if settings.db.POOL_DISABLE else None,
     )
+
+
+engine = create_db_engine(
+    connection_settings=DBConnectionSettings(
+        username=settings.db.USER,
+        password=settings.db.PASSWORD,
+        host=settings.db.HOST,
+        port=settings.db.PORT,
+        database=settings.db.NAME,
+    )
+)
+
+
 """Configure via DatabaseSettings.
 
 Overrides default JSON

app/lib/test_extras/db_plugins.py

@@ -0,0 +1,107 @@
+from asyncio import current_task
+from typing import AsyncGenerator, Callable, Generator
+
+import pytest
+from _pytest.fixtures import FixtureRequest
+from _pytest.tmpdir import TempPathFactory
+from sqlalchemy import create_engine
+from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_scoped_session
+from sqlalchemy.orm import sessionmaker
+
+import settings_test
+from televend_core.databases.televend_repositories.mapper import start_televend_mappers
+from televend_core.databases.televend_repositories.repository import (
+    TelevendRepositoryManager,
+)
+from televend_core.test_extras import factory_boy_utils
+from televend_core.test_extras.database_utils import (
+    DatabaseConfig,
+    configure_database,
+    generate_async_engine,
+    generate_test_database_name,
+    xdist_lock_pytest,
+)
+
+TELEVEND_TEMPLATE_DATABASE_CONFIG = DatabaseConfig(
+    engine="postgresql",
+    user=settings_test.POSTGRES_TEST_USER,
+    password=settings_test.POSTGRES_TEST_PASSWORD,
+    name="test_televend",
+    host=settings_test.POSTGRES_HOST,
+    port=settings_test.POSTGRES_PORT,
+)
+
+
+@pytest.fixture(scope="session")
+def televend_fixture_setup(worker_id: int, tmp_path_factory: TempPathFactory) -> None:
+    start_televend_mappers("selectin")
+
+    # get the temp directory shared by all workers
+    # When xdist is disabled (running with -n0 for example), then worker_id will return "master"
+    if worker_id == "master":
+        root_tmp_dir = tmp_path_factory.getbasetemp()
+    else:
+        root_tmp_dir = tmp_path_factory.getbasetemp().parent
+
+    file_path = root_tmp_dir / "televend_fixture.txt"
+    lock_path = file_path.with_suffix(".lock")
+
+    xdist_lock_pytest(
+        file_path=file_path,
+        lock_path=lock_path,
+        fn=lambda: configure_database(
+            connection_string=TELEVEND_TEMPLATE_DATABASE_CONFIG.to_connection_string(),
+            database_type="cloud",
+        ),
+    )
+
+
+@pytest.fixture(scope="function")
+def televend_test_database_name(request: FixtureRequest) -> Generator[str, None, None]:
+    test_database_name = generate_test_database_name(test_name=request.node.originalname)
+    yield test_database_name
+
+
+@pytest.fixture(scope="function")
+async def async_televend_engine(
+    televend_fixture_setup: Callable, televend_test_database_name: str
+) -> AsyncGenerator[AsyncEngine, None]:
+    async for async_engine in generate_async_engine(
+        template_database_config=TELEVEND_TEMPLATE_DATABASE_CONFIG,
+        test_database_name=televend_test_database_name,
+    ):
+        yield async_engine
+
+
+@pytest.fixture(scope="function")
+async def async_televend_session(
+    async_televend_engine: AsyncEngine,
+) -> AsyncGenerator[AsyncSession, None]:
+    # Prepare a new, clean async_session, one sync async_session for factory boy and one async for normal usage
+    sync_engine = create_engine(
+        url=async_televend_engine.url.set(drivername="postgresql"), pool_size=1, max_overflow=1
+    )
+    factory_boy_utils.TelevendSession.configure(bind=sync_engine)
+
+    televend_async_session_factory = sessionmaker(
+        bind=async_televend_engine, expire_on_commit=False, class_=AsyncSession
+    )
+    televend_async_session = async_scoped_session(
+        televend_async_session_factory, scopefunc=current_task
+    )
+    session = televend_async_session()
+    yield session
+
+    factory_boy_utils.TelevendSession.remove()
+    await session.rollback()  # to avoid coroutine 'Transaction.rollback' was never awaited warning
+    await televend_async_session.remove()
+
+
+@pytest.fixture(scope="function")
+def televend_repository_manager(
+    async_televend_session: AsyncSession, async_televend_engine: AsyncEngine
+) -> TelevendRepositoryManager:
+    return TelevendRepositoryManager(
+        async_session=async_televend_session,
+        async_engine=async_televend_engine,
+    )

app/lib/test_extras/db_setup.py

@@ -0,0 +1,93 @@
+from typing import Protocol
+
+import asyncpg
+import sqlalchemy
+from asyncpg import Connection, DuplicateDatabaseError, InvalidCatalogNameError
+
+from migrate import DatabaseConfig, migrate
+
+
+class TestingSettingsInitOptions(Protocol):
+    DB_HOST: str
+    DB_PORT: int
+    DB_TEMPLATE_NAME: str
+    DB_NAME: str
+    DB_USER: str
+    DB_PASSWORD: str
+    DROP_DATABASE_BEFORE_TESTS: bool
+    DROP_DATABASE_AFTER_TESTS: bool
+
+
+class TestingDatabaseSetup:
+    def __init__(self, options: TestingSettingsInitOptions):
+        self.options = options
+
+        db_connection_url = sqlalchemy.engine.URL.create(
+            drivername="postgresql",
+            username=self.options.DB_USER,
+            password=self.options.DB_PASSWORD,
+            host=self.options.DB_HOST,
+            port=self.options.DB_PORT,
+        )
+        self.connection_str = db_connection_url.render_as_string(hide_password=False)
+
+    async def _create_template_db(self, conn: Connection):
+        query = f"CREATE DATABASE {self.options.DB_TEMPLATE_NAME}"
+        try:
+            await conn.execute(query)
+        except DuplicateDatabaseError:
+            ...
+
+    async def _drop_template_db(self, conn: Connection):
+        query = f"DROP DATABASE {self.options.DB_TEMPLATE_NAME}"
+        try:
+            await conn.execute(query)
+        except InvalidCatalogNameError:
+            ...
+
+    async def _create_test_db(self, conn: Connection):
+        query = f"CREATE DATABASE {self.options.DB_NAME} TEMPLATE {self.options.DB_TEMPLATE_NAME}"
+        try:
+            await conn.execute(query)
+        except DuplicateDatabaseError:
+            ...
+
+    async def _drop_test_db(self, conn: Connection):
+        query = f"DROP DATABASE {self.options.DB_NAME}"
+        try:
+            await conn.execute(query)
+        except InvalidCatalogNameError:
+            ...
+
+    def _migrate_template_database(self):
+        conf = DatabaseConfig(
+            HOST=self.options.DB_HOST,
+            PORT=self.options.DB_PORT,
+            NAME=self.options.DB_TEMPLATE_NAME,
+            USER=self.options.DB_USER,
+            PASSWORD=self.options.DB_PASSWORD,
+        )
+        migrate(conf)
+
+    async def init_db(self):
+        conn = await asyncpg.connect(self.connection_str, database="postgres")
+
+        if self.options.DROP_DATABASE_BEFORE_TESTS:
+            await self._drop_template_db(conn)
+
+        await self._create_template_db(conn)
+        await self._create_test_db(conn)
+        await conn.close()
+
+        if self.options.DROP_DATABASE_BEFORE_TESTS:
+            self._migrate_template_database()
+
+    async def tear_down_db(self):
+        conn = await asyncpg.connect(self.connection_str, database="postgres")
+
+        await self._drop_test_db(conn)
+
+        if self.options.DROP_DATABASE_AFTER_TESTS:
+            await self._drop_template_db(conn)
+
+        await conn.close()

migrate.py

@@ -1,5 +1,6 @@
 import subprocess
 from dataclasses import dataclass
+from pathlib import Path
 
 from app.lib import settings
 
@@ -14,13 +15,18 @@ class DatabaseConfig:
 
 
 def migrate(conf: DatabaseConfig) -> None:
+    script_path = Path(__file__).parent
+    migrations_path = script_path / "migrations"
+    conf_file = migrations_path / "flyway.conf"
+
     args = [
         settings.db.FLYWAY_PATH,
         "migrate",
         f"-url=jdbc:postgresql://{conf.HOST}:{conf.PORT}/{conf.NAME}",
         f"-user={conf.USER}",
         f"-password={conf.PASSWORD}",
-        "-configFiles=migrations/flyway.conf",
+        f"-configFiles={conf_file}",
+        f"-locations=filesystem:{migrations_path}",
     ]
 
     subprocess.run(

poetry.lock

@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.6.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -171,6 +171,7 @@ files = [
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+    {file = "greenlet-2.0.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:d967650d3f56af314b72df7089d96cda1083a7fc2da05b375d2bc48c82ab3f3c"},
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@@ -179,6 +180,7 @@ files = [
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+    {file = "greenlet-2.0.2-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:d4606a527e30548153be1a9f155f4e283d109ffba663a15856089fb55f933e47"},
     {file = "greenlet-2.0.2-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:c48f54ef8e05f04d6eff74b8233f6063cb1ed960243eacc474ee73a2ea8573ca"},
     {file = "greenlet-2.0.2-cp311-cp311-manylinux_2_17_ppc64le.manylinux2014_ppc64le.whl", hash = "sha256:a1846f1b999e78e13837c93c778dcfc3365902cfb8d1bdb7dd73ead37059f0d0"},
     {file = "greenlet-2.0.2-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3a06ad5312349fec0ab944664b01d26f8d1f05009566339ac6f63f56589bc1a2"},
@@ -208,6 +210,7 @@ files = [
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+    {file = "greenlet-2.0.2-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:1087300cf9700bbf455b1b97e24db18f2f77b55302a68272c56209d5587c12d1"},
     {file = "greenlet-2.0.2-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:ba2956617f1c42598a308a84c6cf021a90ff3862eddafd20c3333d50f0edb45b"},
     {file = "greenlet-2.0.2-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:fc3a569657468b6f3fb60587e48356fe512c1754ca05a564f11366ac9e306526"},
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@@ -216,6 +219,7 @@ files = [
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+    {file = "greenlet-2.0.2-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:8512a0c38cfd4e66a858ddd1b17705587900dd760c6003998e9472b77b56d417"},
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@@ -699,6 +703,24 @@ pluggy = ">=0.12,<2.0"
 [package.extras]
 testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
 
+[[package]]
+name = "pytest-asyncio"
+version = "0.21.1"
+description = "Pytest support for asyncio"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pytest-asyncio-0.21.1.tar.gz", hash = "sha256:40a7eae6dded22c7b604986855ea48400ab15b069ae38116e8c01238e9eeb64d"},
+    {file = "pytest_asyncio-0.21.1-py3-none-any.whl", hash = "sha256:8666c1c8ac02631d7c51ba282e0c69a8a452b211ffedf2599099845da5c5c37b"},
+]
+
+[package.dependencies]
+pytest = ">=7.0.0"
+
+[package.extras]
+docs = ["sphinx (>=5.3)", "sphinx-rtd-theme (>=1.0)"]
+testing = ["coverage (>=6.2)", "flaky (>=3.5.0)", "hypothesis (>=5.7.1)", "mypy (>=0.931)", "pytest-trio (>=0.7.0)"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.8.2"
@@ -739,6 +761,7 @@ files = [
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@@ -746,8 +769,15 @@ files = [
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+    {file = "PyYAML-6.0.1-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:e7d73685e87afe9f3b36c799222440d6cf362062f78be1013661b00c5c6f678b"},
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+    {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6c22bec3fbe2524cde73d7ada88f6566758a8f7227bfbf93a408a9d86bcc12a0"},
+    {file = "PyYAML-6.0.1-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:8d4e9c88387b0f5c7d5f281e55304de64cf7f9c0021a3525bd3b1c542da3b0e4"},
+    {file = "PyYAML-6.0.1-cp312-cp312-win32.whl", hash = "sha256:d483d2cdf104e7c9fa60c544d92981f12ad66a457afae824d146093b8c294c54"},
+    {file = "PyYAML-6.0.1-cp312-cp312-win_amd64.whl", hash = "sha256:0d3304d8c0adc42be59c5f8a4d9e3d7379e6955ad754aa9d6ab7a398b59dd1df"},
     {file = "PyYAML-6.0.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:50550eb667afee136e9a77d6dc71ae76a44df8b3e51e41b77f6de2932bfe0f47"},
     {file = "PyYAML-6.0.1-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:1fe35611261b29bd1de0070f0b2f47cb6ff71fa6595c077e42bd0c419fa27b98"},
     {file = "PyYAML-6.0.1-cp36-cp36m-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:704219a11b772aea0d8ecd7058d0082713c3562b4e271b849ad7dc4a5c90c13c"},
@@ -764,6 +794,7 @@ files = [
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a0cd17c15d3bb3fa06978b4e8958dcdc6e0174ccea823003a106c7d4d7899ac5"},
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:28c119d996beec18c05208a8bd78cbe4007878c6dd15091efb73a30e90539696"},
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7e07cbde391ba96ab58e532ff4803f79c4129397514e1413a7dc761ccd755735"},
+    {file = "PyYAML-6.0.1-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:49a183be227561de579b4a36efbb21b3eab9651dd81b1858589f796549873dd6"},
     {file = "PyYAML-6.0.1-cp38-cp38-win32.whl", hash = "sha256:184c5108a2aca3c5b3d3bf9395d50893a7ab82a38004c8f61c258d4428e80206"},
     {file = "PyYAML-6.0.1-cp38-cp38-win_amd64.whl", hash = "sha256:1e2722cc9fbb45d9b87631ac70924c11d3a401b2d7f410cc0e3bbf249f2dca62"},
     {file = "PyYAML-6.0.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:9eb6caa9a297fc2c2fb8862bc5370d0303ddba53ba97e71f08023b6cd73d16a8"},
@@ -771,6 +802,7 @@ files = [
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:5773183b6446b2c99bb77e77595dd486303b4faab2b086e7b17bc6bef28865f6"},
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:b786eecbdf8499b9ca1d697215862083bd6d2a99965554781d0d8d1ad31e13a0"},
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:bc1bf2925a1ecd43da378f4db9e4f799775d6367bdb94671027b73b393a7c42c"},
+    {file = "PyYAML-6.0.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:04ac92ad1925b2cff1db0cfebffb6ffc43457495c9b3c39d3fcae417d7125dc5"},
     {file = "PyYAML-6.0.1-cp39-cp39-win32.whl", hash = "sha256:faca3bdcf85b2fc05d06ff3fbc1f83e1391b3e724afa3feba7d13eeab355484c"},
     {file = "PyYAML-6.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:510c9deebc5c0225e8c96813043e62b680ba2f9c50a08d3724c7f28a747d1486"},
     {file = "PyYAML-6.0.1.tar.gz", hash = "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43"},
@@ -849,7 +881,7 @@ files = [
 ]
 
 [package.dependencies]
-greenlet = {version = "!=0.4.17", markers = "platform_machine == \"aarch64\" or platform_machine == \"ppc64le\" or platform_machine == \"x86_64\" or platform_machine == \"amd64\" or platform_machine == \"AMD64\" or platform_machine == \"win32\" or platform_machine == \"WIN32\""}
+greenlet = {version = "!=0.4.17", markers = "platform_machine == \"win32\" or platform_machine == \"WIN32\" or platform_machine == \"AMD64\" or platform_machine == \"amd64\" or platform_machine == \"x86_64\" or platform_machine == \"ppc64le\" or platform_machine == \"aarch64\""}
 typing-extensions = ">=4.2.0"
 
 [package.extras]
@@ -942,4 +974,4 @@ anyio = ">=3.0.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "28c7f9f4b78e7d602b076108d3138c854cd1a1bc22c447987a6aedbba6300dcd"
+content-hash = "2f47c374edfb8ee537dd4eeb7406bd443bdf0ed3bdd760e764a363ffd1b4650f"

pyproject.toml

@@ -18,6 +18,7 @@ pydantic-settings = "^2.0.3"
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.4.2"
 watchfiles = "^0.20.0"
+pytest-asyncio = "^0.21.1"
 
 [build-system]
 requires = ["poetry-core"]

settings_test.py

@@ -0,0 +1,11 @@
+import logging
+
+POSTGRES_HOST: str = "localhost"
+POSTGRES_PORT: int = 5432
+POSTGRES_TEST_USER = "addressbook"
+POSTGRES_TEST_PASSWORD = "addressbook"
+
+LOG_PATH = "/tmp/addressbook-log"
+MIN_LOG_LEVEL: int = logging.INFO
+DROP_TEMPLATE_DATABASE_BEFORE_TESTS: bool = False
+FLYWAY_BINARY_PATH: str = "/usr/bin/flyway"

tests/conftest.py

@@ -0,0 +1,109 @@
+import asyncio
+import logging
+from datetime import datetime
+from typing import AsyncGenerator
+
+import msgspec
+import pytest_asyncio
+import sqlalchemy
+from _pytest.config import Config
+from sqlalchemy import NullPool, event
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from app.lib import settings
+from app.lib.sqlalchemy_plugin import _default
+from app.lib.test_extras.db_setup import TestingDatabaseSetup
+
+# A Guide To Database Unit Testing with Pytest and SQLAlchemy
+# https://coderpad.io/blog/development/a-guide-to-database-unit-testing-with-pytest-and-sqlalchemy/
+
+
+db_connection_url = sqlalchemy.engine.URL.create(
+    drivername="postgresql+asyncpg",
+    username=settings.testing.DB_USER,
+    password=settings.testing.DB_PASSWORD,
+    host=settings.testing.DB_HOST,
+    port=settings.testing.DB_PORT,
+    database=settings.testing.DB_NAME,
+)
+
+engine = create_async_engine(
+    db_connection_url,
+    echo=settings.db.ECHO,
+    echo_pool=settings.db.ECHO_POOL,
+    json_serializer=msgspec.json.Encoder(enc_hook=_default),
+    max_overflow=settings.db.POOL_MAX_OVERFLOW,
+    pool_size=settings.db.POOL_SIZE,
+    pool_timeout=settings.db.POOL_TIMEOUT,
+    poolclass=NullPool if settings.db.POOL_DISABLE else None,
+)
+
+async_session_factory = async_sessionmaker(
+    engine, expire_on_commit=False, class_=AsyncSession
+)
+
+
+TestingAsyncSessionLocal = async_sessionmaker(
+    engine,
+    expire_on_commit=False,
+    autoflush=False,
+    autocommit=False,
+    class_=AsyncSession,
+)
+
+
+@pytest_asyncio.fixture(scope="function")
+async def db_session() -> AsyncGenerator[AsyncSession, None]:
+    """The expectation with async_sessions is that the
+    transactions be called on the connection object instead of the
+    session object.
+    Detailed explanation of async transactional tests
+    <https://github.com/sqlalchemy/sqlalchemy/issues/5811>
+    """
+
+    async with engine.connect() as connection:
+        trans = await connection.begin()
+        async with TestingAsyncSessionLocal(bind=connection) as async_session:
+            nested = await connection.begin_nested()
+
+            @event.listens_for(async_session.sync_session, "after_transaction_end")
+            def end_savepoint(session, transaction):
+                nonlocal nested
+
+                if not nested.is_active:
+                    nested = connection.sync_connection.begin_nested()
+
+            yield async_session
+
+            await trans.rollback()
+
+    await engine.dispose(close=True)
+
+
+# @pytest.fixture(scope="session")
+# def event_loop():
+#     """
+#     Creates an instance of the default event loop for the test session.
+#     """
+#     policy = asyncio.get_event_loop_policy()
+#     loop = policy.new_event_loop()
+#     yield loop
+#     loop.close()
+
+
+pytest_plugins = (
+    # "app.lib.test_extras.db_plugins",
+)
+
+
+def pytest_configure(config: Config) -> None:
+    logging.info(f"Starting tests: {datetime.utcnow()}")
+    db_setup = TestingDatabaseSetup(options=settings.testing)
+    asyncio.run(db_setup.init_db())
+    print()
+
+
+def pytest_unconfigure(config: Config) -> None:
+    logging.info(f"Ending tests: {datetime.utcnow()}")
+    db_setup = TestingDatabaseSetup(options=settings.testing)
+    asyncio.run(db_setup.tear_down_db())

tests/test_general.py

@@ -0,0 +1,41 @@
+# A Guide To Database Unit Testing with Pytest and SQLAlchemy
+# https://coderpad.io/blog/development/a-guide-to-database-unit-testing-with-pytest-and-sqlalchemy/
+
+import pytest
+from sqlalchemy import text, event
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+
+from app.domain.city import City
+from app.lib import settings
+from app.lib.sqlalchemy_plugin import engine
+
+import pytest
+import pytest_asyncio
+import sqlalchemy
+from sqlalchemy.ext.asyncio import (
+    AsyncSession,
+    create_async_engine,
+    async_scoped_session,
+    AsyncConnection,
+)
+
+
+class TestGeneral:
+    @pytest.fixture(scope="function", autouse=True)
+    def setup_class(self, db_session):
+        self.db_session = db_session
+
+    # async def teardown_class(self):
+    #     await self.session.rollback()
+    #     await self.session.close()
+
+    @pytest.mark.asyncio
+    async def test_bla(self):
+        stmt = text("select * from cities")
+        result = await self.db_session.execute(stmt)
+        print("#"*100)
+        for c in result:
+            print(c)
+        print("#"*100)
+
+        assert True