HACKING: Document how to keep test repos around

diff --git a/HACKING b/HACKING
index 03ab9ffaf3c9ed439de5afc971c1ee024994335c..6238f02dabb2765c4e807cafef84dc8bd57fc104 100644 (file)
--- a/HACKING
+++ b/HACKING
@@ -26,6 +26,11 @@ single test e.g.
 
    nosetests3 tests/component/deb/test_push.py:TestPush.test_push_failure
 
+If you want to keep any temporary repos around for inspection use
+`GBP_TESTS_NOCLEAN`:
+
+   GBP_TESTS_NOCLEAN=1 nosetests3 tests/component/deb/test_push.py:TestPush.test_push_failure
+
 Building the API Docs
 ---------------------
 You can build the API docs using