* fix tests

tests/database.c

@@ -3,33 +3,59 @@
 
 int main()
 {
-  imdb_db_t db;
+  imdb_db_t *db;
   imdb_rec_t rec[2];
   imdb_block_t blk;
   char *path = "test.db";
+  int mode = 0, err = 0, num;
+  bool ret;
 
   unlink(path);
-  assert(imdb_open(&db, path, 1) == 1);
+
+  db = imdb_open(path, mode, &err);
+  assert(db == NULL);
+  assert(err == -1); /* no such file */
+
+  ret = imdb_create(path);
+  assert(ret == true);
+
+  db = imdb_open(path, mode, &err);
+  assert(db != NULL);
 
   rec[0].num = 1;
-  assert(imdb_read_rec(&db, rec) == 0);
+  err = imdb_read_rec(db, rec);
+  assert(err < 0); /* no such record */
 
   memset(rec[0].data, 0xAA, IMDB_REC_LEN);
-  assert(imdb_write_rec(&db, rec) == 1);
+  memset(rec[0].data, 0xFF, 1); /* record is used */
+
+  num = imdb_write_rec(db, rec);
+  assert(num != 1); /* database open in read-only mode */
+
+  imdb_close(db);
+
+  mode |= IMDB_FLAG_WRITE;
+  db = imdb_open(path, mode, &err);
+  assert(db != NULL);
+
+  num = imdb_write_rec(db, rec);
+  assert(num == 1); /* success */
 
-  assert(imdb_read_rec(&db, rec) == 1);
+  num = imdb_read_rec(db, rec);
+  assert(num == 1);
 
   blk.start   = 1;
   blk.records = 2;
   blk.data    = NULL;
-  assert(imdb_read_blk(&db, &blk) == 1);
+  num = imdb_read_blk(db, &blk);
+  assert(num == 1);
   assert(blk.records == 1);
   assert(blk.data != NULL);
 
   rec[0].num = 1;
   rec[1].num = 3;
 
-  assert(imdb_close(&db) == 0);
+  imdb_close(db);
 
   return 0;
 }