test_cmp "$TEST_DIRECTORY/t4013/diff.diff_--cached_--_file0" result
'
+test_expect_success 'diff-tree --stdin with log formatting' '
+ cat >expect <<-\EOF &&
+ Side
+ Third
+ Second
+ EOF
+ git rev-list master | git diff-tree --stdin --format=%s -s >actual &&
+ test_cmp expect actual
+'
+
test_done