git rev-list --all --objects >/dev/null
'
+test_perf 'rev-list --parents' '
+ git rev-list --parents HEAD >/dev/null
+'
+
+test_expect_success 'create dummy file' '
+ echo unlikely-to-already-be-there >dummy &&
+ git add dummy &&
+ git commit -m dummy
+'
+
+test_perf 'rev-list -- dummy' '
+ git rev-list HEAD -- dummy
+'
+
+test_perf 'rev-list --parents -- dummy' '
+ git rev-list --parents HEAD -- dummy
+'
+
test_expect_success 'create new unreferenced commit' '
commit=$(git commit-tree HEAD^{tree} -p HEAD) &&
test_export commit