diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index fdffbb5..39fef32 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -24,8 +24,13 @@ jobs:
           key: venv-${{ hashFiles('poetry.lock') }}
       - name: Install the project dependencies
         run: poetry install
+      - uses: actions/cache@v3
+        name: Define a cache for the tox based on the tox config file
+        with:
+          path: ./.tox
+          key: tox-${{ hashFiles('tox.ini') }}
       - name: Run unit tests
-        run: poetry run pytest
+        run: poetry run tox
       - name: Run lint
         run: poetry run ruff --output-format=github .
 
@@ -52,7 +57,7 @@ jobs:
           path: ./.venv
           key: venv-${{ hashFiles('poetry.lock') }}
       - name: Install the project dependencies
-        run: poetry install
+        run: poetry install --with inttests
       - name: Install atlas
         uses: ariga/setup-atlas@master
       - name: Run Test as Standalone
diff --git a/.gitignore b/.gitignore
index c05a44a..072bc9e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+*~
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]
@@ -159,4 +161,7 @@ cython_debug/
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 .idea/
 
-TODO.md
\ No newline at end of file
+# Direnv
+.envrc
+
+TODO.md
diff --git a/atlas_provider_sqlalchemy/ddl.py b/atlas_provider_sqlalchemy/ddl.py
index 8c1ddf4..c70d7d4 100644
--- a/atlas_provider_sqlalchemy/ddl.py
+++ b/atlas_provider_sqlalchemy/ddl.py
@@ -2,67 +2,91 @@
 import importlib.util
 import inspect
 from pathlib import Path
-from sqlalchemy import create_mock_engine
-from sqlalchemy.orm import DeclarativeBase
-from typing import Type, Set, List
+from typing import Any, Protocol
+
+import sqlalchemy as sa
+
+
+class DBTableDesc(Protocol):
+    """Database table description (SQLAlchemy table or model)."""
+
+    metadata: sa.MetaData
+
+
+class ModuleImportError(Exception):
+    pass
 
 
 class ModelsNotFoundError(Exception):
     pass
 
 
-def get_declarative_base(models_dir: Path, skip_errors: bool = False) -> Type[DeclarativeBase]:
-    """
-    Walk the directory tree starting at the root, import all models, and return 1 of them, as they all keep a
-    reference to the Metadata object. The way sqlalchemy works, you must import all classes in order for them to be
-    registered in Metadata.
+def sqlalchemy_version() -> tuple[int, ...]:
+    """Get major and minor version of sqlalchemy."""
+
+    return tuple(int(x) for x in sa.__version__.split("."))
+
+
+def create_mock_engine(url: str, executor: Any) -> Any:
+    """Create a "mock" engine used for echoing DDL."""
+
+    if sqlalchemy_version() < (1, 4):
+        return sa.create_engine(url, strategy="mock", executor=executor)
+    else:
+        return sa.create_mock_engine(url, executor)
+
+
+def get_metadata(db_dir: Path, skip_errors: bool = False) -> sa.MetaData:
+    """Walk the directory tree starting at the root, import all models and
+    tables, and return metadata for one of them, as they all keep a reference
+    to the `MetaData` object.  The way SQLAlchemy works, you must import all
+    models and tables in order for them to be registered in metadata.
     """
 
-    models: Set[Type[DeclarativeBase]] = set()
-    for root, _, _ in os.walk(models_dir):
-        python_file_paths = Path(root).glob('*.py')
+    metadata: set[sa.MetaData] = set()
+
+    for root, _, _ in os.walk(db_dir):
+        python_file_paths = Path(root).glob("*.py")
         for file_path in python_file_paths:
             try:
                 module_spec = importlib.util.spec_from_file_location(
-                    file_path.stem, file_path)
+                    file_path.stem,
+                    file_path,
+                )
                 if module_spec and module_spec.loader:
                     module = importlib.util.module_from_spec(module_spec)
                     module_spec.loader.exec_module(module)
             except Exception as e:
                 if skip_errors:
                     continue
-                print(f'{e.__class__.__name__}: {str(e)} in {file_path}')
-                print("To skip on failed import, run: atlas-provider-sqlalchemy --skip-errors")
-                exit(1)
-                continue
-            classes = {c[1]
-                       for c in inspect.getmembers(module, inspect.isclass)
-                       if hasattr(c[1], "metadata") and c[1] is not DeclarativeBase}
-            models.update(classes)
-    if not models:
-        print('Found no sqlalchemy models in the directory tree.')
-        exit(1)
-    return models.pop()
-
-
-def dump_ddl(dialect_driver: str, base: Type[DeclarativeBase]) -> Type[DeclarativeBase]:
-    """
-    Creates a mock engine and dumps its DDL to stdout
-    """
 
-    def dump(sql, *multiparams, **params):
-        print(str(sql.compile(dialect=engine.dialect)).replace('\t', '').replace('\n', ''), end=';\n\n')
+                raise ModuleImportError(f"{e.__class__.__name__}: {str(e)} in {file_path}")
 
-    engine = create_mock_engine(f'{dialect_driver}://', dump)
-    base.metadata.create_all(engine, checkfirst=False)
-    return base
+            ms = {
+                v.metadata
+                for (_, v) in inspect.getmembers(module)
+                if hasattr(v, "metadata") and isinstance(v.metadata, sa.MetaData)
+            }
+            metadata.update(ms)
+
+    if not metadata:
+        raise ModelsNotFoundError("Found no sqlalchemy models/tables in the directory tree.")
+
+    return metadata.pop()
+
+
+def dump_ddl(dialect_driver: str, metadata: sa.MetaData) -> sa.MetaData:
+    """Dump DDL statements for the given metadata to stdout."""
+
+    def dump(sql, *multiparams, **params):
+        print(str(sql.compile(dialect=engine.dialect)).replace("\t", "").replace("\n", ""), end=";\n\n")
 
+    engine = create_mock_engine(f"{dialect_driver}://", dump)
+    metadata.create_all(engine, checkfirst=False)
+    return metadata
 
-def get_import_path_from_path(path: Path, root_dir: Path) -> str:
-    import_path = '.'.join(path.relative_to(
-        root_dir).parts).replace(path.suffix, '')
-    return import_path
 
+def print_ddl(dialect_driver: str, models: list[DBTableDesc]) -> None:
+    """Dump DDL statements for the metadata from the given models/tables to stdout."""
 
-def print_ddl(dialect_driver: str, models: List[Type[DeclarativeBase]]):
-    dump_ddl(dialect_driver=dialect_driver, base=models[0])
+    dump_ddl(dialect_driver=dialect_driver, metadata=models[0].metadata)
diff --git a/atlas_provider_sqlalchemy/main.py b/atlas_provider_sqlalchemy/main.py
index f0357f1..20d082f 100644
--- a/atlas_provider_sqlalchemy/main.py
+++ b/atlas_provider_sqlalchemy/main.py
@@ -1,10 +1,16 @@
 import os
-from pathlib import Path
 from enum import Enum
+from pathlib import Path
+
 import typer
-from sqlalchemy.orm import DeclarativeBase
-from typing import Type
-from atlas_provider_sqlalchemy.ddl import get_declarative_base, dump_ddl
+from sqlalchemy import MetaData
+
+from atlas_provider_sqlalchemy.ddl import (
+    ModuleImportError,
+    ModelsNotFoundError,
+    dump_ddl,
+    get_metadata,
+)
 
 app = typer.Typer(no_args_is_help=True)
 
@@ -17,9 +23,9 @@ class Dialect(str, Enum):
     mssql = "mssql"
 
 
-def run(dialect: Dialect, path: Path, skip_errors: bool = False) -> Type[DeclarativeBase]:
-    base = get_declarative_base(path, skip_errors)
-    return dump_ddl(dialect.value, base)
+def run(dialect: Dialect, path: Path, skip_errors: bool = False) -> MetaData:
+    metadata = get_metadata(path, skip_errors)
+    return dump_ddl(dialect.value, metadata)
 
 
 @app.command()
@@ -29,8 +35,16 @@ def load(dialect: Dialect = Dialect.mysql,
          ):
     if path is None:
         path = Path(os.getcwd())
-    run(dialect, path, skip_errors)
+    try:
+        run(dialect, path, skip_errors)
+    except ModuleImportError as e:
+        print(e)
+        print("To skip on failed import, run: atlas-provider-sqlalchemy --skip-errors")
+        exit(1)
+    except ModelsNotFoundError as e:
+        print(e)
+        exit(1)
 
 
 if __name__ == "__main__":
-    app(prog_name='atlas-provider-sqlalchemy')
+    app(prog_name="atlas-provider-sqlalchemy")
diff --git a/poetry.lock b/poetry.lock
index 7c7e739..14db024 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "autopep8"
@@ -15,6 +15,28 @@ files = [
 pycodestyle = ">=2.11.0"
 tomli = {version = "*", markers = "python_version < \"3.11\""}
 
+[[package]]
+name = "cachetools"
+version = "5.3.3"
+description = "Extensible memoizing collections and decorators"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "cachetools-5.3.3-py3-none-any.whl", hash = "sha256:0abad1021d3f8325b2fc1d2e9c8b9c9d57b04c3932657a72465447332c24d945"},
+    {file = "cachetools-5.3.3.tar.gz", hash = "sha256:ba29e2dfa0b8b556606f097407ed1aa62080ee108ab0dc5ec9d6a723a007d105"},
+]
+
+[[package]]
+name = "chardet"
+version = "5.2.0"
+description = "Universal encoding detector for Python 3"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "chardet-5.2.0-py3-none-any.whl", hash = "sha256:e1cf59446890a00105fe7b7912492ea04b6e6f06d4b742b2c788469e34c82970"},
+    {file = "chardet-5.2.0.tar.gz", hash = "sha256:1b3b6ff479a8c414bc3fa2c0852995695c4a026dcd6d0633b2dd092ca39c1cf7"},
+]
+
 [[package]]
 name = "click"
 version = "8.1.7"
@@ -40,20 +62,47 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "distlib"
+version = "0.3.8"
+description = "Distribution utilities"
+optional = false
+python-versions = "*"
+files = [
+    {file = "distlib-0.3.8-py2.py3-none-any.whl", hash = "sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784"},
+    {file = "distlib-0.3.8.tar.gz", hash = "sha256:1530ea13e350031b6312d8580ddb6b27a104275a31106523b8f123787f494f64"},
+]
+
 [[package]]
 name = "exceptiongroup"
-version = "1.2.0"
+version = "1.2.1"
 description = "Backport of PEP 654 (exception groups)"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "exceptiongroup-1.2.0-py3-none-any.whl", hash = "sha256:4bfd3996ac73b41e9b9628b04e079f193850720ea5945fc96a08633c66912f14"},
-    {file = "exceptiongroup-1.2.0.tar.gz", hash = "sha256:91f5c769735f051a4290d52edd0858999b57e5876e9f85937691bd4c9fa3ed68"},
+    {file = "exceptiongroup-1.2.1-py3-none-any.whl", hash = "sha256:5258b9ed329c5bbdd31a309f53cbfb0b155341807f6ff7606a1e801a891b29ad"},
+    {file = "exceptiongroup-1.2.1.tar.gz", hash = "sha256:a4785e48b045528f5bfe627b6ad554ff32def154f42372786903b7abcfe1aa16"},
 ]
 
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "filelock"
+version = "3.14.0"
+description = "A platform independent file lock."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "filelock-3.14.0-py3-none-any.whl", hash = "sha256:43339835842f110ca7ae60f1e1c160714c5a6afd15a2873419ab185334975c0f"},
+    {file = "filelock-3.14.0.tar.gz", hash = "sha256:6ea72da3be9b8c82afd3edcf99f2fffbb5076335a5ae4d03248bb5b6c3eae78a"},
+]
+
+[package.extras]
+docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-autodoc-typehints (>=1.25.2)"]
+testing = ["covdefaults (>=2.3)", "coverage (>=7.3.2)", "diff-cover (>=8.0.1)", "pytest (>=7.4.3)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-timeout (>=2.2)"]
+typing = ["typing-extensions (>=4.8)"]
+
 [[package]]
 name = "greenlet"
 version = "3.0.3"
@@ -173,38 +222,38 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "1.9.0"
+version = "1.10.0"
 description = "Optional static typing for Python"
 optional = false
 python-versions = ">=3.8"
 files = [
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-    {file = "mypy-1.9.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:d357423fa57a489e8c47b7c85dfb96698caba13d66e086b412298a1a0ea3b0ed"},
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+    {file = "SQLAlchemy-2.0.30-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:8409de825f2c3b62ab15788635ccaec0c881c3f12a8af2b12ae4910a0a9aeef6"},
+    {file = "SQLAlchemy-2.0.30-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:0094c5dc698a5f78d3d1539853e8ecec02516b62b8223c970c86d44e7a80f6c7"},
+    {file = "SQLAlchemy-2.0.30-cp39-cp39-musllinux_1_1_aarch64.whl", hash = "sha256:edc16a50f5e1b7a06a2dcc1f2205b0b961074c123ed17ebda726f376a5ab0953"},
+    {file = "SQLAlchemy-2.0.30-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:f7703c2010355dd28f53deb644a05fc30f796bd8598b43f0ba678878780b6e4c"},
+    {file = "SQLAlchemy-2.0.30-cp39-cp39-win32.whl", hash = "sha256:1f9a727312ff6ad5248a4367358e2cf7e625e98b1028b1d7ab7b806b7d757513"},
+    {file = "SQLAlchemy-2.0.30-cp39-cp39-win_amd64.whl", hash = "sha256:a0ef36b28534f2a5771191be6edb44cc2673c7b2edf6deac6562400288664221"},
+    {file = "SQLAlchemy-2.0.30-py3-none-any.whl", hash = "sha256:7108d569d3990c71e26a42f60474b4c02c8586c4681af5fd67e51a044fdea86a"},
+    {file = "SQLAlchemy-2.0.30.tar.gz", hash = "sha256:2b1708916730f4830bc69d6f49d37f7698b5bd7530aca7f04f785f8849e95255"},
 ]
 
 [package.dependencies]
@@ -458,67 +541,81 @@ files = [
 ]
 
 [[package]]
-name = "typer"
-version = "0.12.0"
-description = "Typer, build great CLIs. Easy to code. Based on Python type hints."
+name = "tox"
+version = "4.15.0"
+description = "tox is a generic virtualenv management and test command line tool"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "typer-0.12.0-py3-none-any.whl", hash = "sha256:0441a0bb8962fb4383b8537ada9f7eb2d0deda0caa2cfe7387cc221290f617e4"},
-    {file = "typer-0.12.0.tar.gz", hash = "sha256:900fe786ce2d0ea44653d3c8ee4594a22a496a3104370ded770c992c5e3c542d"},
+    {file = "tox-4.15.0-py3-none-any.whl", hash = "sha256:300055f335d855b2ab1b12c5802de7f62a36d4fd53f30bd2835f6a201dda46ea"},
+    {file = "tox-4.15.0.tar.gz", hash = "sha256:7a0beeef166fbe566f54f795b4906c31b428eddafc0102ac00d20998dd1933f6"},
 ]
 
 [package.dependencies]
-typer-cli = "0.12.0"
-typer-slim = {version = "0.12.0", extras = ["standard"]}
+cachetools = ">=5.3.2"
+chardet = ">=5.2"
+colorama = ">=0.4.6"
+filelock = ">=3.13.1"
+packaging = ">=23.2"
+platformdirs = ">=4.1"
+pluggy = ">=1.3"
+pyproject-api = ">=1.6.1"
+tomli = {version = ">=2.0.1", markers = "python_version < \"3.11\""}
+virtualenv = ">=20.25"
 
-[[package]]
-name = "typer-cli"
-version = "0.12.0"
-description = "Typer, build great CLIs. Easy to code. Based on Python type hints."
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "typer_cli-0.12.0-py3-none-any.whl", hash = "sha256:7b7e2dd49f59974bb5a869747045d5444b17bffb851e006cd424f602d3578104"},
-    {file = "typer_cli-0.12.0.tar.gz", hash = "sha256:603ed3d5a278827bd497e4dc73a39bb714b230371c8724090b0de2abdcdd9f6e"},
-]
-
-[package.dependencies]
-typer-slim = {version = "0.12.0", extras = ["standard"]}
+[package.extras]
+docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-argparse-cli (>=1.11.1)", "sphinx-autodoc-typehints (>=1.25.2)", "sphinx-copybutton (>=0.5.2)", "sphinx-inline-tabs (>=2023.4.21)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.11)"]
+testing = ["build[virtualenv] (>=1.0.3)", "covdefaults (>=2.3)", "detect-test-pollution (>=1.2)", "devpi-process (>=1)", "diff-cover (>=8.0.2)", "distlib (>=0.3.8)", "flaky (>=3.7)", "hatch-vcs (>=0.4)", "hatchling (>=1.21)", "psutil (>=5.9.7)", "pytest (>=7.4.4)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-xdist (>=3.5)", "re-assert (>=1.1)", "time-machine (>=2.13)", "wheel (>=0.42)"]
 
 [[package]]
-name = "typer-slim"
-version = "0.12.0"
+name = "typer"
+version = "0.12.3"
 description = "Typer, build great CLIs. Easy to code. Based on Python type hints."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "typer_slim-0.12.0-py3-none-any.whl", hash = "sha256:ddd7042b29a32140528caa415750bcae54113ba0c32270ca11a6f64069ddadf9"},
-    {file = "typer_slim-0.12.0.tar.gz", hash = "sha256:3e8a3f17286b173d76dca0fd4e02651c9a2ce1467b3754876b1ac4bd72572beb"},
+    {file = "typer-0.12.3-py3-none-any.whl", hash = "sha256:070d7ca53f785acbccba8e7d28b08dcd88f79f1fbda035ade0aecec71ca5c914"},
+    {file = "typer-0.12.3.tar.gz", hash = "sha256:49e73131481d804288ef62598d97a1ceef3058905aa536a1134f90891ba35482"},
 ]
 
 [package.dependencies]
 click = ">=8.0.0"
-rich = {version = ">=10.11.0", optional = true, markers = "extra == \"standard\""}
-shellingham = {version = ">=1.3.0", optional = true, markers = "extra == \"standard\""}
+rich = ">=10.11.0"
+shellingham = ">=1.3.0"
 typing-extensions = ">=3.7.4.3"
 
-[package.extras]
-all = ["rich (>=10.11.0)", "shellingham (>=1.3.0)"]
-standard = ["rich (>=10.11.0)", "shellingham (>=1.3.0)"]
-
 [[package]]
 name = "typing-extensions"
-version = "4.10.0"
+version = "4.11.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "typing_extensions-4.10.0-py3-none-any.whl", hash = "sha256:69b1a937c3a517342112fb4c6df7e72fc39a38e7891a5730ed4985b5214b5475"},
-    {file = "typing_extensions-4.10.0.tar.gz", hash = "sha256:b0abd7c89e8fb96f98db18d86106ff1d90ab692004eb746cf6eda2682f91b3cb"},
+    {file = "typing_extensions-4.11.0-py3-none-any.whl", hash = "sha256:c1f94d72897edaf4ce775bb7558d5b79d8126906a14ea5ed1635921406c0387a"},
+    {file = "typing_extensions-4.11.0.tar.gz", hash = "sha256:83f085bd5ca59c80295fc2a82ab5dac679cbe02b9f33f7d83af68e241bea51b0"},
 ]
 
+[[package]]
+name = "virtualenv"
+version = "20.26.1"
+description = "Virtual Python Environment builder"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "virtualenv-20.26.1-py3-none-any.whl", hash = "sha256:7aa9982a728ae5892558bff6a2839c00b9ed145523ece2274fad6f414690ae75"},
+    {file = "virtualenv-20.26.1.tar.gz", hash = "sha256:604bfdceaeece392802e6ae48e69cec49168b9c5f4a44e483963f9242eb0e78b"},
+]
+
+[package.dependencies]
+distlib = ">=0.3.7,<1"
+filelock = ">=3.12.2,<4"
+platformdirs = ">=3.9.1,<5"
+
+[package.extras]
+docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2,!=7.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
+test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
+
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "11c4d214135349e168df1a9bcdb4d0223d1f47f4ca8414b8fa7cfc978edba499"
+content-hash = "bb16a07a7d672f9a2d8699ebd7516ff77770863df241e62f377e12537fd99bd5"
diff --git a/pyproject.toml b/pyproject.toml
index 642158c..09b2fb7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "atlas-provider-sqlalchemy"
-version = "0.1.0"
+version = "0.2.0"
 description = "Load sqlalchemy models into an Atlas project."
 authors = ["Your Name <you@example.com>"]
 readme = "README.md"
@@ -8,15 +8,21 @@ packages = [{include = "atlas_provider_sqlalchemy"}]
 
 [tool.poetry.dependencies]
 python = "^3.8"
-sqlalchemy = "^2.0.21"
 typer = ">0.9.0,<=1.0.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.4.2"
+tox = "^4.15.0"
 ruff = "^0.1.8"
 autopep8 = "^2.0.4"
 mypy = "^1.5.1"
 
+[tool.poetry.group.inttests]
+optional = true
+
+[tool.poetry.group.inttests.dependencies]
+sqlalchemy = "^2.0.21"
+
 [tool.poetry.scripts]
 atlas-provider-sqlalchemy = "atlas_provider_sqlalchemy.main:app"
 
diff --git a/tests/invalid_models/invalid_models.py b/tests/invalid_models/invalid_models.py
new file mode 100644
index 0000000..4ba168c
--- /dev/null
+++ b/tests/invalid_models/invalid_models.py
@@ -0,0 +1,34 @@
+from typing import List, Optional
+from sqlalchemy import ForeignKey, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship, DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class User(Base):
+    __tablename__ = "user_account"
+    id: Mapped[int] = mapped_column(primary_key=True)
+    name: Mapped[str] = mapped_column(String(30))
+    fullname: Mapped[Optional[str]] = mapped_column(String(30))
+    addresses: Mapped[List["Address"]] = relationship(
+        back_populates="user", cascade="all, delete-orphan"
+    )
+
+    def __repr__(self) -> str:
+        return f"User(id={self.id!r}, name={self.name!r}, fullname={self.fullname!r})"
+
+
+class Address(Base):
+    __tablename__ = "address"
+    id: Mapped[int] = mapped_column(primary_key=True)
+    email_address: Mapped[str] = mapped_column(String(30))
+    user_id: Mapped[int] = mapped_column(ForeignKey("user_account.id"))
+    user: Mapped["User"] = relationship(back_populates="addresses")
+
+    def __repr__(self) -> str:
+        return f"Address(id={self.id!r}, email_address={self.email_address!r})"
+
+
+raise Exception("failure")
diff --git a/tests/invalid_models/models.py b/tests/invalid_models/models.py
new file mode 100644
index 0000000..77c3e4f
--- /dev/null
+++ b/tests/invalid_models/models.py
@@ -0,0 +1,31 @@
+from typing import List, Optional
+from sqlalchemy import ForeignKey, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship, DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class User(Base):
+    __tablename__ = "user_account"
+    id: Mapped[int] = mapped_column(primary_key=True)
+    name: Mapped[str] = mapped_column(String(30))
+    fullname: Mapped[Optional[str]] = mapped_column(String(30))
+    addresses: Mapped[List["Address"]] = relationship(
+        back_populates="user", cascade="all, delete-orphan"
+    )
+
+    def __repr__(self) -> str:
+        return f"User(id={self.id!r}, name={self.name!r}, fullname={self.fullname!r})"
+
+
+class Address(Base):
+    __tablename__ = "address"
+    id: Mapped[int] = mapped_column(primary_key=True)
+    email_address: Mapped[str] = mapped_column(String(30))
+    user_id: Mapped[int] = mapped_column(ForeignKey("user_account.id"))
+    user: Mapped["User"] = relationship(back_populates="addresses")
+
+    def __repr__(self) -> str:
+        return f"Address(id={self.id!r}, email_address={self.email_address!r})"
diff --git a/tests/tables/tables.py b/tests/tables/tables.py
new file mode 100644
index 0000000..6157cb2
--- /dev/null
+++ b/tests/tables/tables.py
@@ -0,0 +1,19 @@
+import sqlalchemy as sa
+
+_metadata = sa.MetaData()
+
+users = sa.Table(
+    "user_account",
+    _metadata,
+    sa.Column("id", sa.Integer, primary_key=True),
+    sa.Column("name", sa.String(30), nullable=False),
+    sa.Column("fullname", sa.String(30)),
+)
+
+addresses = sa.Table(
+    "address",
+    _metadata,
+    sa.Column("id", sa.Integer, primary_key=True),
+    sa.Column("email_address", sa.String(30), nullable=False),
+    sa.Column("user_id", sa.ForeignKey("user_account.id"), nullable=False),
+)
diff --git a/tests/test_main.py b/tests/test_main.py
index ad673e1..62e2cba 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,51 +1,118 @@
-from atlas_provider_sqlalchemy.main import run, get_declarative_base, Dialect
 from pathlib import Path
-from sqlalchemy.orm import DeclarativeBase
+
 import pytest
+from pytest import CaptureFixture
+from sqlalchemy import MetaData
+
+from atlas_provider_sqlalchemy.ddl import sqlalchemy_version
+from atlas_provider_sqlalchemy.main import (
+    Dialect,
+    ModuleImportError,
+    ModelsNotFoundError,
+    get_metadata,
+    run,
+)
 
 
-def test_run_postgres(capsys):
-    with open('tests/ddl_postgres.sql', 'r') as f:
+@pytest.mark.skipif(
+    sqlalchemy_version() < (2, 0),
+    reason="requires SQLAlchemy>=2.0",
+)
+@pytest.mark.parametrize(
+    "dialect, expected_ddl_file",
+    [
+        (Dialect.postgresql, "tests/ddl_postgres.sql"),
+        (Dialect.mysql, "tests/ddl_mysql.sql"),
+    ],
+)
+def test_run_models(
+    dialect: Dialect,
+    expected_ddl_file: str,
+    capsys: CaptureFixture,
+) -> None:
+    with open(expected_ddl_file, "r") as f:
         expected_ddl = f.read()
-    base = run(Dialect.postgresql, Path("tests/models"))
+    metadata = run(dialect, Path("tests/models"))
     captured = capsys.readouterr()
     assert captured.out == expected_ddl
-    base.metadata.clear()
+    metadata.clear()
 
 
-def test_run_mysql(capsys):
-    with open('tests/ddl_mysql.sql', 'r') as f:
+@pytest.mark.parametrize(
+    "dialect, expected_ddl_file",
+    [
+        (Dialect.postgresql, "tests/ddl_postgres.sql"),
+        (Dialect.mysql, "tests/ddl_mysql.sql"),
+    ],
+)
+def test_run_old_models(
+    dialect: Dialect,
+    expected_ddl_file: str,
+    capsys: CaptureFixture,
+) -> None:
+    with open(expected_ddl_file, "r") as f:
         expected_ddl = f.read()
-    base = run(Dialect.mysql, Path("tests/models"))
+    metadata = run(dialect, Path("tests/old_models"))
     captured = capsys.readouterr()
     assert captured.out == expected_ddl
-    base.metadata.clear()
+    metadata.clear()
 
 
-def test_run_old_declarative_base(capsys):
-    with open('tests/ddl_mysql.sql', 'r') as f:
+@pytest.mark.parametrize(
+    "dialect, expected_ddl_file",
+    [
+        (Dialect.postgresql, "tests/ddl_postgres.sql"),
+        (Dialect.mysql, "tests/ddl_mysql.sql"),
+    ],
+)
+def test_run_models_2(
+    dialect: Dialect,
+    expected_ddl_file: str,
+    capsys: CaptureFixture,
+) -> None:
+    with open(expected_ddl_file, "r") as f:
         expected_ddl = f.read()
-    base = run(Dialect.mysql, Path("tests/old_models"))
+    metadata = run(dialect, Path("tests/tables"))
     captured = capsys.readouterr()
     assert captured.out == expected_ddl
-    base.metadata.clear()
+    metadata.clear()
 
 
-def test_get_old_declarative_base():
-    base = get_declarative_base(Path("tests/old_models"))
-    assert not issubclass(base, DeclarativeBase)
-    base.metadata.clear()
+def test_get_old_metadata() -> None:
+    metadata = get_metadata(Path("tests/old_models"))
+    assert isinstance(metadata, MetaData)
+    metadata.clear()
 
 
-def test_get_declarative_base_explicit_path():
-    base = get_declarative_base(Path("tests/models"))
-    assert issubclass(base, DeclarativeBase)
-    base.metadata.clear()
+@pytest.mark.skipif(
+    sqlalchemy_version() < (2, 0),
+    reason="requires SQLAlchemy>=2.0",
+)
+def test_get_metadata_explicit_path() -> None:
+    metadata = get_metadata(Path("tests/models"))
+    assert isinstance(metadata, MetaData)
+    metadata.clear()
 
 
-def test_get_declarative_base_explicit_path_fail(capsys):
-    with pytest.raises(SystemExit):
-        base = get_declarative_base(Path("nothing/here"))
-        base.metadata.clear()
-    captured = capsys.readouterr()
-    assert captured.out == 'Found no sqlalchemy models in the directory tree.\n'
+def test_get_metadata_explicit_path_fail() -> None:
+    with pytest.raises(ModelsNotFoundError):
+        get_metadata(Path("nothing/here"))
+
+
+@pytest.mark.skipif(
+    sqlalchemy_version() < (2, 0),
+    reason="requires SQLAlchemy>=2.0",
+)
+def test_get_metadata_invalid_models() -> None:
+    with pytest.raises(ModuleImportError):
+        get_metadata(Path("tests/invalid_models"))
+
+
+@pytest.mark.skipif(
+    sqlalchemy_version() < (2, 0),
+    reason="requires SQLAlchemy>=2.0",
+)
+def test_get_metadata_invalid_models_skip_errors() -> None:
+    metadata = get_metadata(Path("tests/invalid_models"), skip_errors=True)
+    assert isinstance(metadata, MetaData)
+    metadata.clear()
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..489d15a
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,14 @@
+[tox]
+requires =
+    tox>=4
+env_list = sqlalchemy{12,13,14,20}
+
+[testenv]
+deps =
+  pytest>=7.4.2,<8.0.0
+  sqlalchemy12: SQLAlchemy>=1.2.0,<1.3.0
+  sqlalchemy13: SQLAlchemy>=1.3.0,<1.4.0
+  sqlalchemy14: SQLAlchemy>=1.4.0,<2.0.0
+  sqlalchemy20: SQLAlchemy>=2.0.0,<2.1.0
+commands =
+  pytest {posargs: .}