closeshieldoutputstreamtest.java

来自「java 的io 操作类 java 的io 操作类」· Java 代码 · 共 63 行

/*
 * 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.output;

import java.io.IOException;
import java.io.OutputStream;

import junit.framework.TestCase;

/**
 * JUnit Test Case for {@link CloseShieldOutputStream}.
 */
public class CloseShieldOutputStreamTest extends TestCase {

    private ByteArrayOutputStream original;

    private OutputStream shielded;

    private boolean closed;

    protected void setUp() {
        original = new ByteArrayOutputStream() {
            public void close() {
                closed = true;
            }
        };
        shielded = new CloseShieldOutputStream(original);
        closed = false;
    }

    /**
     * Test the <code>close()</code> method.
     */
    public void testClose() throws IOException {
        shielded.close();
        assertFalse("closed", closed);
        try {
            shielded.write('x');
            fail("write(b)");
        } catch (IOException e) {
            // expected
        }
        original.write('y');
        assertEquals(1, original.size());
        assertEquals('y', original.toByteArray()[0]);
    }

}