-test -z "$GIT_TEST_CLONE_2GB" &&
-say "Skipping expensive 2GB clone test; enable it with GIT_TEST_CLONE_2GB=t" &&
-test_done &&
-exit
+if test -z "$GIT_TEST_CLONE_2GB"
+then
+ say 'Skipping expensive 2GB clone test; enable it with GIT_TEST_CLONE_2GB=t'
+else
+ test_set_prereq CLONE_2GB
+fi