test_cmp expected actual
'
+cat >expected <<EOF
+67a36f1
+EOF
+
+test_expect_success 'Check short objectname format' '
+ git for-each-ref --format="%(objectname:short)" refs/heads >actual &&
+ test_cmp expected actual
+'
+
test_expect_success 'Check for invalid refname format' '
test_must_fail git for-each-ref --format="%(refname:INVALID)"
'