test: add error reporting tests

This first half of the tests is all that don't need to retrieve the
the error string explicitly from the notmuch database structure.

test/T560-lib-error.sh

@@ -0,0 +1,136 @@
+#!/usr/bin/env bash
+test_description="error reporting for library"
+
+. ./test-lib.sh
+
+backup_database () {
+    rm -rf notmuch-dir-backup
+    cp -pR ${MAIL_DIR}/.notmuch notmuch-dir-backup
+}
+restore_database () {
+    rm -rf ${MAIL_DIR}/.notmuch
+    cp -pR notmuch-dir-backup ${MAIL_DIR}/.notmuch
+}
+
+
+add_email_corpus
+
+test_expect_success "building database" "NOTMUCH_NEW"
+
+test_begin_subtest "Open null pointer"
+test_C <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+int main (int argc, char** argv)
+{
+    notmuch_database_t *db;
+    notmuch_status_t stat;
+    stat = notmuch_database_open (NULL, 0, 0);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Error: Cannot open a database for a NULL path.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "Open nonexistent database"
+test_C <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+int main (int argc, char** argv)
+{
+    notmuch_database_t *db;
+    notmuch_status_t stat;
+    stat = notmuch_database_open ("/nonexistent/foo", 0, 0);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Error opening database at /nonexistent/foo/.notmuch: No such file or directory
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "create NULL path"
+test_C <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+int main (int argc, char** argv)
+{
+    notmuch_status_t stat;
+    stat = notmuch_database_create (NULL, NULL);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Error: Cannot create a database for a NULL path.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "Create database in non-existant directory"
+test_C <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+int main (int argc, char** argv)
+{
+    notmuch_database_t *db;
+    notmuch_status_t stat;
+    stat = notmuch_database_create ("/nonexistent/foo", &db);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Error: Cannot create database at /nonexistent/foo: No such file or directory.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "Write to read-only database"
+test_C ${MAIL_DIR} <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+int main (int argc, char** argv)
+{
+   notmuch_database_t *db;
+   notmuch_status_t stat;
+   stat = notmuch_database_open (argv[1], NOTMUCH_DATABASE_MODE_READ_ONLY, &db);
+   if (stat != NOTMUCH_STATUS_SUCCESS) {
+     fprintf (stderr, "error opening database: %d\n", stat);
+   }
+   stat = notmuch_database_add_message (db, "/dev/null", NULL);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Cannot write to a read-only database.
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "compact, overwriting existing backup"
+test_C ${MAIL_DIR} <<'EOF'
+#include <stdio.h>
+#include <notmuch.h>
+static void
+status_cb (const char *msg, void *closure)
+{
+    printf ("%s\n", msg);
+}
+int main (int argc, char** argv)
+{
+   notmuch_database_t *db;
+   notmuch_status_t stat;
+   stat = notmuch_database_compact (argv[1], argv[1], status_cb, NULL);
+}
+EOF
+cat <<'EOF' >EXPECTED
+== stdout ==
+== stderr ==
+Path already exists: CWD/mail
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_done