package org.multiverse.collections;
import org.junit.Before;
import org.junit.Test;
import org.multiverse.api.Stm;
import org.multiverse.api.Txn;
import org.multiverse.api.callables.TxnVoidCallable;
import static org.junit.Assert.*;
import static org.multiverse.api.GlobalStmInstance.getGlobalStmInstance;
import static org.multiverse.api.StmUtils.atomic;
import static org.multiverse.api.TxnThreadLocal.clearThreadLocalTxn;
public class NaiveTxnLinkedList_peekFirstTest {
private Stm stm;
private NaiveTxnLinkedList<String> list;
@Before
public void setUp() {
stm = getGlobalStmInstance();
clearThreadLocalTxn();
list = new NaiveTxnLinkedList<String>(stm);
}
@Test
public void whenEmpty() {
atomic(new TxnVoidCallable() {
@Override
public void call(Txn tx) throws Exception {
String result = list.peekFirst();
assertNull(result);
assertEquals("[]", list.toString());
assertEquals(0, list.size());
}
});
}
@Test
public void whenMultipleItems() {
atomic(new TxnVoidCallable() {
@Override
public void call(Txn tx) throws Exception {
list.offerLast("1");
list.offerLast("2");
list.offerLast("3");
String found = list.peekFirst();
assertEquals("1", found);
assertEquals("[1, 2, 3]", list.toString());
assertEquals(3, list.size());
}
});
}
@Test
public void whenSingleItem() {
atomic(new TxnVoidCallable() {
@Override
public void call(Txn tx) throws Exception {
String item = "1";
list.put(item);
String found = list.peekFirst();
assertSame(item, found);
assertEquals("[1]", list.toString());
assertEquals(1, list.size());
}
});
}
}