diff --git a/pyproject.toml b/pyproject.toml
index 3c1fc4f2..f39f9ec4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,13 @@ version_file = "fusesoc/version.py"
 [tool.setuptools.packages.find]
 #where = ["fusesoc/"]
 include = ["fusesoc", "fusesoc.capi2", "fusesoc.provider", "fusesoc.parser"]
-#include = ["mynamespace.subpackage_a"]
 
 [project.scripts]
 fusesoc = "fusesoc.main:main"
+
+[tox]
+isolated_build = True
+
+[testenv]
+commands = pytest
+envlist = py3