/*
 * 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 org.apache.commons.io.input;

import static org.apache.commons.io.IOUtils.EOF;
import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;

/**
 * Tests {@link ClosedInputStream}.
 */
public class ClosedInputStreamTest {

    private void assertEof(final ClosedInputStream cis) {
        assertEquals(EOF, cis.read(), "read()");
    }

    @Test
    public void testRead() throws Exception {
        try (ClosedInputStream cis = new ClosedInputStream()) {
            assertEof(cis);
        }
    }

    @Test
    public void testReadArray() throws Exception {
        try (ClosedInputStream cis = new ClosedInputStream()) {
            assertEquals(EOF, cis.read(new byte[4096]));
            assertEquals(EOF, cis.read(new byte[1]));
            assertEquals(EOF, cis.read(new byte[0]));
        }
    }

    @Test
    public void testReadArrayIndex() throws Exception {
        try (ClosedInputStream cis = new ClosedInputStream()) {
            assertEquals(EOF, cis.read(new byte[4096], 0, 1));
            assertEquals(EOF, cis.read(new byte[1], 0, 1));
            assertEquals(EOF, cis.read(new byte[0], 0, 0));
        }
    }

    @Test
    public void testSingleton() throws Exception {
        try (@SuppressWarnings("deprecation")
        ClosedInputStream cis = ClosedInputStream.CLOSED_INPUT_STREAM) {
            assertEof(cis);
        }
        try (ClosedInputStream cis = ClosedInputStream.INSTANCE) {
            assertEof(cis);
        }
    }

}
