Add autouse tmp_doctest_path fixture in conftest.py

Author: jdavies-st

docs/conftest.py

@@ -0,0 +1,20 @@
+import os
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def tmp_doctest_path(request, tmp_path):
+    """Run doctests in isolated temp dir so outputs do not end up in repo"""
+    # Trigger ONLY for doctestplus
+    doctest_plugin = request.config.pluginmanager.getplugin("doctestplus")
+    if isinstance(request.node.parent, doctest_plugin._doctest_textfile_item_cls):
+        start_path = Path.cwd()
+        os.chdir(tmp_path)
+        try:
+            yield tmp_path
+        finally:
+            os.chdir(start_path)
+    else:
+        yield