tox.ini: Fix CI for python 3.7
We were encountering new errors from versioneer trying to write to the
repository in order to record the version number, and so we needed to set:
SETUPTOOLS_ENABLE_FEATURES = "legacy-editable"
diff --git a/tox.ini b/tox.ini
index cf21f8e..33462b7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -75,6 +75,10 @@
py{37,38,39,310}: BST_TEST_XDG_CACHE_HOME = {envtmpdir}/cache
py{37,38,39,310}: BST_TEST_XDG_CONFIG_HOME = {envtmpdir}/config
py{37,38,39,310}: BST_TEST_XDG_DATA_HOME = {envtmpdir}/share
+
+ # This is required to run tests with python 3.7
+ py37: SETUPTOOLS_ENABLE_FEATURES = "legacy-editable"
+
# This is required to get coverage for Cython
py{37,38,39,310}-!nocover: BST_CYTHON_TRACE = 1
randomized: PYTEST_ADDOPTS="--random-order-bucket=global"
