test_cmp expect actual
'
+# This guards against the alternative of showing the diffs vs. the
+# reflog ancestor. The reflog used is designed to list the commits
+# more than once, so as to exercise the corresponding logic.
+test_expect_success 'git log -g -p shows diffs vs. parents' '
+ test_commit two &&
+ git branch flipflop &&
+ git update-ref refs/heads/flipflop -m flip1 HEAD^ &&
+ git update-ref refs/heads/flipflop -m flop1 HEAD &&
+ git update-ref refs/heads/flipflop -m flip2 HEAD^ &&
+ git log -g -p flipflop >reflog &&
+ grep -v ^Reflog reflog >actual &&
+ git log -1 -p HEAD^ >log.one &&
+ git log -1 -p HEAD >log.two &&
+ (
+ cat log.one; echo
+ cat log.two; echo
+ cat log.one; echo
+ cat log.two
+ ) >expect &&
+ test_cmp expect actual
+'
+
test_done