diff --git a/.gitignore b/.gitignore
index a0cfd5c7ffe..35f45e747b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -97,3 +97,7 @@ examples/jupyter/plots
 *.c
 *.html
 *.so
+
+.cache/
+.tox/
+.python-version
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 00000000000..bd3bec5689e
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,2 @@
+include readme.rst
+include openmc/data/reconstruct.pyx
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 00000000000..951bd8cd0cd
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,9 @@
+[tox]
+envlist = py{34,36}
+[testenv]
+commands = pytest tests/unit_tests
+deps =
+     pytest
+     numpy
+     cython
+passenv = OPENMC_CROSS_SECTIONS