Fix 3.7 and Windows problems

Change-Id: Iec9544a055a1a2e3e2a87b8dce8360ffa64a67c3

test/util/helpers.py

diff --git a/test/util/helpers.py b/test/util/helpers.py
index 0ca4c2d..86402c8 100644
--- a/test/util/helpers.py
+++ b/test/util/helpers.py
@@ -19,9 +19,19 @@
     ]
 
 
+def _unlink_path(path, missing_ok=False):
+    # Replicate 3.8+ functionality in 3.7
+    cm = contextlib.nullcontext()
+    if missing_ok:
+        cm = contextlib.suppress(FileNotFoundError)
+
+    with cm:
+        path.unlink()
+
+
 def replace_file_with_dir(pathspec):
     path = pathlib.Path(pathspec)
-    path.unlink(missing_ok=True)
+    _unlink_path(path, missing_ok=True)
     path.mkdir(exist_ok=True)
     return path
 

tox.ini

diff --git a/tox.ini b/tox.ini
index dc0530b..8b2b0d2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,8 +15,8 @@
 
 setenv=
     cov: COVERAGE={[testenv]cov_args}
-    TEST_TEMPLATE_BASE={toxinidir}/test/templates
-    TEST_MODULE_BASE={env:TEST_TEMPLATE_BASE}/modules
+    TEST_TEMPLATE_BASE={toxinidir}{/}test{/}templates
+    TEST_MODULE_BASE={env:TEST_TEMPLATE_BASE}{/}modules
 
 commands=pytest {env:COVERAGE:} {posargs}