computer-test/src/main/java/com/baidu/hugegraph/computer/core/sort/sorter/EmptyFlusherTest.java

/*
 * Copyright 2017 HugeGraph Authors
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.baidu.hugegraph.computer.core.sort.sorter;

import java.util.NoSuchElementException;

import org.junit.Test;

import com.baidu.hugegraph.computer.core.sort.flusher.PeekableIterator;
import com.baidu.hugegraph.testutil.Assert;

public class EmptyFlusherTest {

    @Test
    public void test() throws Exception {
        PeekableIterator<Double> it = PeekableIterator.emptyIterator();
        Assert.assertFalse(it.hasNext());

        Assert.assertThrows(NoSuchElementException.class, () -> {
            it.next();
        });

        Assert.assertThrows(UnsupportedOperationException.class, () -> {
            it.metadata("key");
        });

        Assert.assertThrows(NoSuchElementException.class, () -> {
            it.peek();
        });

        it.close();
    }
}