Really exclude "tests" directory to be installed into
${PYTHONPREFIX_SITELIBDIR}

https://github.com/pudo/normality/pull/18

--- setup.py.orig	2022-04-11 10:30:15 UTC
+++ setup.py
@@ -24,7 +24,7 @@ setup(
     url="http://github.com/pudo/normality",
     license="MIT",
     package_data={"banal": ["py.typed"]},
-    packages=find_packages(exclude=["ez_setup", "examples", "test"]),
+    packages=find_packages(exclude=["ez_setup", "examples", "tests"]),
     namespace_packages=[],
     include_package_data=True,
     zip_safe=False,