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/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed 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.google.common.io;
import static org.junit.Assert.assertThrows;
import java.io.ByteArrayOutputStream;
/**
* Unit tests for {@link CountingOutputStream}.
*
* @author Chris Nokleberg
*/
public class CountingOutputStreamTest extends IoTestCase {
public void testCount() throws Exception {
int written = 0;
ByteArrayOutputStream out = new ByteArrayOutputStream();
CountingOutputStream counter = new CountingOutputStream(out);
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
counter.write(0);
written += 1;
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
byte[] data = new byte[10];
counter.write(data);
written += 10;
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
counter.write(data, 0, 5);
written += 5;
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
counter.write(data, 2, 5);
written += 5;
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
// Test that illegal arguments do not affect count
assertThrows(IndexOutOfBoundsException.class, () -> counter.write(data, 0, data.length + 1));
assertEquals(written, out.size());
assertEquals(written, counter.getCount());
}
}
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