Isolate the tests from the user's home directory.

Closes #35

Author: jaraco

conftest.py

@@ -6,6 +6,10 @@
 from jaraco import vcs
 
 
+# isolate the tests from a developer's VCS config
+pytestmark = pytest.mark.usefixtures('tmp_home_dir')
+
+
 def _ensure_present(mgr):
     try:
         mgr.version()

pyproject.toml

@@ -45,6 +45,7 @@ test = [
 	"pygments",
 	"jaraco.path",
 	"types-python-dateutil",
+	"pytest-home",
 ]
 doc = [
 	# upstream