t-reftable-merged: add test for REFTABLE_FORMAT_ERROR

When calling reftable_new_merged_table(), if the hash ID of the
passed reftable_table parameter doesn't match the passed hash_id
parameter, a REFTABLE_FORMAT_ERROR is thrown. This case is
currently left unexercised, so add a test for the same.

Mentored-by: Patrick Steinhardt <ps@pks.im>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Chandra Pratap <chandrapratap3519@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/unit-tests/t-reftable-merged.c b/t/unit-tests/t-reftable-merged.c
index 9f9275f87167bb256fe42274eebb61f7d7e08de0..b6263ee8b5a1f667e357a426a0b6e09a74748403 100644 (file)
--- a/t/unit-tests/t-reftable-merged.c
+++ b/t/unit-tests/t-reftable-merged.c
@@ -11,6 +11,7 @@ https://developers.google.com/open-source/licenses/bsd
 #include "reftable/constants.h"
 #include "reftable/merged.h"
 #include "reftable/reader.h"
+#include "reftable/reftable-error.h"
 #include "reftable/reftable-generic.h"
 #include "reftable/reftable-merged.h"
 #include "reftable/reftable-writer.h"
@@ -440,6 +441,8 @@ static void t_default_write_opts(void)
        check_int(hash_id, ==, GIT_SHA1_FORMAT_ID);
 
        reftable_table_from_reader(&tab[0], rd);
+       err = reftable_new_merged_table(&merged, tab, 1, GIT_SHA256_FORMAT_ID);
+       check_int(err, ==, REFTABLE_FORMAT_ERROR);
        err = reftable_new_merged_table(&merged, tab, 1, GIT_SHA1_FORMAT_ID);
        check(!err);