commit-graph: define GIT_TEST_COMMIT_GRAPH

diff --git a/t/README b/t/README
index 8373a27fea38b1ec111e80d203bf61f1143b7861..fed7a066ab03ce2999f0a734341685134b85b7fc 100644 (file)
--- a/t/README
+++ b/t/README
@@ -315,6 +315,14 @@ packs on demand. This normally only happens when the object size is
 over 2GB. This variable forces the code path on any object larger than
 <n> bytes.
 
+GIT_TEST_OE_DELTA_SIZE=<n> exercises the uncomon pack-objects code
+path where deltas larger than this limit require extra memory
+allocation for bookkeeping.
+
+GIT_TEST_COMMIT_GRAPH=<boolean>, when true, forces the commit-graph to
+be written after every 'git commit' command, and overrides the
+'core.commitGraph' setting to true.
+
 Naming Tests
 ------------