Add a bdb-layer test for the regression introduced by [4330]. Addresses #855, #856.

git-svn-id: file:///svn/tokudb@4347 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/cursor-step-over-delete.c

+#include <db.h>
+#include <sys/stat.h>
+#include "test.h"
+
+static DB_ENV *env;
+static DB *db;
+DB_TXN *txn;
+
+void setup (void) {
+    system("rm -rf " ENVDIR);
+    int r;
+    r=mkdir(ENVDIR, 0777);       CKERR(r);
+
+    r=db_env_create(&env, 0); CKERR(r);
+    env->set_errfile(env, stderr);
+    r=env->open(env, ENVDIR, DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_CREATE|DB_PRIVATE, 0777); CKERR(r);
+    r=db_create(&db, env, 0); CKERR(r);
+
+    r=env->txn_begin(env, 0, &txn, 0); assert(r==0);
+    r=db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, 0777); CKERR(r);
+    r=txn->commit(txn, 0);    assert(r==0);
+}
+
+void doit (void) {
+    DBT key,data;
+    int r;
+    r=env->txn_begin(env, 0, &txn, 0); assert(r==0);
+    r=db->put(db, txn, dbt_init(&key, "a", 2), dbt_init(&data, "a", 2), DB_YESOVERWRITE);
+    r=db->put(db, txn, dbt_init(&key, "b", 2), dbt_init(&data, "b", 2), DB_YESOVERWRITE);
+    r=db->put(db, txn, dbt_init(&key, "c", 2), dbt_init(&data, "c", 2), DB_YESOVERWRITE);
+    r=txn->commit(txn, 0);    assert(r==0);
+    
+    r=env->txn_begin(env, 0, &txn, 0); assert(r==0);
+    r=db->del(db, txn, dbt_init(&key, "b", 2),  0); assert(r==0);
+    r=txn->commit(txn, 0);    assert(r==0);
+
+    r=env->txn_begin(env, 0, &txn, 0); assert(r==0);    
+    DBC *dbc;
+    r = db->cursor(db, txn, &dbc, 0);                           assert(r==0);
+    memset(&key,  0, sizeof(key));
+    memset(&data, 0, sizeof(data));
+    r = dbc->c_get(dbc, &key, &data, DB_FIRST);                 assert(r==0);
+    assert(strcmp(key.data, "a")==0);
+    assert(strcmp(data.data, "a")==0);
+    r = dbc->c_get(dbc, &key, &data, DB_NEXT);                  assert(r==0);
+    assert(strcmp(key.data, "c")==0);
+    assert(strcmp(data.data, "c")==0);
+    r = dbc->c_close(dbc);                                      assert(r==0);
+    r=txn->commit(txn, 0);    assert(r==0);
+}
+
+int main (int argc, const char *argv[]) {
+    parse_args(argc, argv);
+
+    setup();
+    doit();
+
+    return 0;
+}