[PATCH v2 4/4] t-reftable-readwrite: add test for known error

When using reftable_writer_add_ref() to add a ref record to a
reftable writer, The update_index of the ref record must be within
the limits set by reftable_writer_set_limits(), or REFTABLE_API_ERROR
is returned. This scenario is currently left untested. Add a test
case for the same.

Mentored-by: Patrick Steinhardt [off-list ref]
Mentored-by: Christian Couder [off-list ref]
Signed-off-by: Chandra Pratap <redacted>
---
 t/unit-tests/t-reftable-readwrite.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/t/unit-tests/t-reftable-readwrite.c b/t/unit-tests/t-reftable-readwrite.c
index 7daf28ec6d..a5462441d3 100644
--- a/t/unit-tests/t-reftable-readwrite.c
+++ b/t/unit-tests/t-reftable-readwrite.c

@@ -773,6 +773,11 @@ static void t_write_key_order(void)
 	check(!err);
 	err = reftable_writer_add_ref(w, &refs[1]);
 	check_int(err, ==, REFTABLE_API_ERROR);
+
+	refs[0].update_index = 2;
+	err = reftable_writer_add_ref(w, &refs[0]);
+	check_int(err, ==, REFTABLE_API_ERROR);
+
 	reftable_writer_close(w);
 	reftable_writer_free(w);
 	strbuf_release(&buf);

-- 
2.45.GIT