The documentation claims that the database will be set to NULL in this
case, but it is currently not happening. Based on a reproducer [1]
from Austin Ray.

[1]: id:20211021190401.imirxau2ewke6e2m@athena
---
 test/T590-libconfig.sh | 45 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/test/T590-libconfig.sh b/test/T590-libconfig.sh
index 59b82a6f..d2ea4a2b 100755
--- a/test/T590-libconfig.sh
+++ b/test/T590-libconfig.sh
@@ -849,4 +849,49 @@ zzzafter afterval
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "open: database set to null on missing config"
+test_subtest_known_broken
+test_C ${MAIL_DIR} "/nonexistent" <<EOF
+#include <notmuch-test.h>
+int main (int argc, char **argv) {
+  notmuch_status_t stat;
+  notmuch_database_t *db = NULL;
+
+  notmuch_status_t st = notmuch_database_open_with_config(argv[1],
+							  NOTMUCH_DATABASE_MODE_READ_ONLY,
+							  argv[2], NULL, &db, NULL);
+  printf("db == NULL: %d\n", db == NULL);
+}
+EOF
+cat <<EOF> EXPECTED
+== stdout ==
+db == NULL: 1
+== stderr ==
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "open: database set to null on missing config (env)"
+test_subtest_known_broken
+old_NOTMUCH_CONFIG=${NOTMUCH_CONFIG}
+NOTMUCH_CONFIG="/nonexistent"
+test_C ${MAIL_DIR} <<EOF
+#include <notmuch-test.h>
+int main (int argc, char **argv) {
+  notmuch_status_t stat;
+  notmuch_database_t *db = NULL;
+
+  notmuch_status_t st = notmuch_database_open_with_config(argv[1],
+							  NOTMUCH_DATABASE_MODE_READ_ONLY,
+							  NULL, NULL, &db, NULL);
+  printf("db == NULL: %d\n", db == NULL);
+}
+EOF
+NOTMUCH_CONFIG=${old_NOTMUCH_CONFIG}
+cat <<EOF> EXPECTED
+== stdout ==
+db == NULL: 1
+== stderr ==
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_done
-- 
2.33.0
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