Initial non working

mock_dependency_litestar/dependencies.py

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+def some_dependency() -> str:
+    return "foo"

mock_dependency_litestar/main.py

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+from litestar import Litestar, get
+from litestar.di import Provide
+
+from mock_dependency_litestar.dependencies import some_dependency
+
+
+@get()
+def handler(dep: str) -> str:
+  return dep
+
+def create_app() -> Litestar:
+  return Litestar([handler], dependencies={"dep": Provide(some_dependency)})

pyproject.toml

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+[tool.poetry]
+name = "mock-dependency-litestar"
+version = "0.1.0"
+description = ""
+authors = ["euri10 <benoit.barthelet@gmail.com>"]
+readme = "README.md"
+packages = [{include = "mock_dependency_litestar"}]
+
+[tool.poetry.dependencies]
+python = "^3.11"
+litestar = "^2.0.0b1"
+pytest = "^7.3.2"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"

tests/test_deps.py

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+from unittest import mock
+
+import pytest
+from litestar.testing import TestClient
+
+from mock_dependency_litestar.main import create_app
+
+
+def new_dependency():
+    return "bar"
+
+
+@pytest.fixture(autouse=True)
+def mock_db():
+    return mock.patch("dependencies.some_dependency", new=new_dependency)
+
+
+@pytest.fixture
+def app():
+  return create_app()
+
+
+def test(app):
+    with TestClient(app) as client:
+        assert client.get("/").text == "bar"