Added test test_cursor_delete_next to test another boundary case of DB_NEXT_DUP.[[BR]]

It is possible to do a cursor delete and then a DB_NEXT_DUP.[[BR]]
BDB handles this properly.
Addresses #121

git-svn-id: file:///svn/tokudb@949 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/test_cursor_delete_next.c

+/* -*- mode: C; c-basic-offset: 4 -*- */
+#ident "Copyright (c) 2007 Tokutek Inc.  All rights reserved."
+
+#include <string.h>
+#include <db.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include "test.h"
+
+// DIR is defined in the Makefile
+
+DBT *dbt_init(DBT *dbt, void *data, u_int32_t size) {
+    memset(dbt, 0, sizeof *dbt);
+    dbt->data = data;
+    dbt->size = size;
+    return dbt;
+}
+
+DB *db;
+DB_ENV *env;
+DBT key;
+DBT value;
+DBC *dbc;
+DB_TXN *const null_txn = 0;
+
+void setup_db(char* name) {
+    int r;
+
+    system("rm -rf " DIR);
+    mkdir(DIR, 0777);
+
+    r = db_env_create(&env, 0);                     CKERR(r);
+    r = env->open(env, DIR, DB_CREATE | DB_PRIVATE | DB_INIT_MPOOL, 0666);  CKERR(r);
+    r = db_create(&db, env, 0);                     CKERR(r);
+    r = db->set_flags(db, DB_DUP | DB_DUPSORT);     CKERR(r);
+    r = db->set_pagesize(db, 4096);                 CKERR(r);
+    r = db->open(db, null_txn, name, "main", DB_BTREE, DB_CREATE, 0666);    CKERR(r);
+}
+
+void close_db() {
+    int r;
+
+    r = db->close(db, 0);                           CKERR(r);
+    r = env->close(env, 0);                         CKERR(r);
+}
+
+void insert() {
+    int r;
+
+    dbt_init(&key, "key", sizeof("key"));
+    dbt_init(&value, "value1", sizeof("value1"));
+    r = db->put(db, null_txn, &key, &value, 0);     CKERR(r);
+
+    dbt_init(&key, "key", sizeof("key"));
+    dbt_init(&value, "value2", sizeof("value2"));
+    r = db->put(db, null_txn, &key, &value, 0);     CKERR(r);
+}
+
+void cursor_range_with_delete(u_int32_t flag) {
+    int r;
+
+    r = db->cursor(db, null_txn, &dbc, 0);          CKERR(r);
+    r = dbc->c_get(dbc, &key, &value, DB_FIRST);    CKERR(r);
+    r = dbc->c_del(dbc, 0);                         CKERR(r);
+    r = dbc->c_get(dbc, &key, &value, flag);        CKERR(r);
+    r = dbc->c_del(dbc, 0);                         CKERR(r);
+    r = dbc->c_close(dbc);                          CKERR(r);
+}
+
+int main() {
+    setup_db("next.db");
+    insert();
+    cursor_range_with_delete(DB_NEXT);
+    close_db();
+    
+    setup_db("nextdup.db");
+    insert();
+    cursor_range_with_delete(DB_NEXT_DUP);
+    close_db();
+    
+    return 0;
+}