From 56dc01ffe04501089a3228267c60405007ecfa1a Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Fri, 22 Mar 2019 16:29:02 +0100
Subject: [PATCH] minor: revisit _possibly_invalidate_import_caches

---
 src/_pytest/pytester.py | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index bc1405176..f8a79ebc9 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -611,12 +611,10 @@ class Testdir(object):
     def _possibly_invalidate_import_caches(self):
         # invalidate caches if we can (py33 and above)
         try:
-            import importlib
+            from importlib import invalidate_caches
         except ImportError:
-            pass
-        else:
-            if hasattr(importlib, "invalidate_caches"):
-                importlib.invalidate_caches()
+            return
+        invalidate_caches()
 
     def mkdir(self, name):
         """Create a new (sub)directory."""