tests: add TEST_KEEPDIR to prevent cleanup of successful tests

Author: ksedgwic

contrib/pyln-testing/pyln/testing/fixtures.py

@@ -31,6 +31,9 @@ def test_base_dir():
 
     yield directory
 
+    if bool(int(os.getenv('TEST_KEEPDIR', '0'))):
+        return
+
     # Now check if any test directory is left because the corresponding test
     # failed. If there are no such tests we can clean up the root test
     # directory.
@@ -92,7 +95,7 @@ def directory(request, test_base_dir, test_name):
     outcome = 'passed' if rep_call is None else rep_call.outcome
     failed = not outcome or request.node.has_errors or outcome != 'passed'
 
-    if not failed:
+    if not failed and not bool(int(os.getenv('TEST_KEEPDIR', '0'))):
         try:
             shutil.rmtree(directory)
         except OSError: