diff --git a/conftest.py b/conftest.py
index ab6c8cae..779ac24b 100644
--- a/conftest.py
+++ b/conftest.py
@@ -3,7 +3,7 @@
 
 collect_ignore = [
     # this module fails mypy tests because 'setup.py' matches './setup.py'
-    'prepare/example/setup.py',
+    'tests/data/sources/example/setup.py',
 ]
 
 
diff --git a/setup.cfg b/setup.cfg
index 27eabc57..3ea2ca08 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,10 +19,6 @@ install_requires =
 	zipp>=0.5
 	typing-extensions>=3.6.4; python_version < "3.8"
 
-[options.packages.find]
-exclude =
-	prepare*
-
 [options.extras_require]
 testing =
 	# upstream
diff --git a/prepare/example/example/__init__.py b/tests/data/sources/example/example/__init__.py
similarity index 100%
rename from prepare/example/example/__init__.py
rename to tests/data/sources/example/example/__init__.py
diff --git a/prepare/example/setup.py b/tests/data/sources/example/setup.py
similarity index 100%
rename from prepare/example/setup.py
rename to tests/data/sources/example/setup.py
diff --git a/prepare/example2/example2/__init__.py b/tests/data/sources/example2/example2/__init__.py
similarity index 100%
rename from prepare/example2/example2/__init__.py
rename to tests/data/sources/example2/example2/__init__.py
diff --git a/prepare/example2/pyproject.toml b/tests/data/sources/example2/pyproject.toml
similarity index 100%
rename from prepare/example2/pyproject.toml
rename to tests/data/sources/example2/pyproject.toml