httpcore5/src/test/java/org/apache/hc/core5/http/impl/nio/TestExpandableBuffer.java

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 * 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
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 * This software consists of voluntary contributions made by many
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package org.apache.hc.core5.http.impl.nio;

import org.hamcrest.CoreMatchers;
import org.hamcrest.MatcherAssert;
import org.junit.Test;

public class TestExpandableBuffer {

    @Test
    public void testBasics() throws Exception {
        final ExpandableBuffer buffer = new ExpandableBuffer(16);
        MatcherAssert.assertThat(buffer.mode(), CoreMatchers.equalTo(ExpandableBuffer.Mode.INPUT));
        MatcherAssert.assertThat(buffer.hasData(), CoreMatchers.equalTo(false));

        buffer.setInputMode();
        buffer.buffer().put(new byte[] { 0, 1, 2, 3, 4, 5});
        MatcherAssert.assertThat(buffer.hasData(), CoreMatchers.equalTo(true));
        MatcherAssert.assertThat(buffer.length(), CoreMatchers.equalTo(6));
        MatcherAssert.assertThat(buffer.buffer().capacity(), CoreMatchers.equalTo(16));
        MatcherAssert.assertThat(buffer.mode(), CoreMatchers.equalTo(ExpandableBuffer.Mode.OUTPUT));

        buffer.setInputMode();
        buffer.buffer().put(new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 });
        MatcherAssert.assertThat(buffer.length(), CoreMatchers.equalTo(16));
        MatcherAssert.assertThat(buffer.buffer().capacity(), CoreMatchers.equalTo(16));
        MatcherAssert.assertThat(buffer.mode(), CoreMatchers.equalTo(ExpandableBuffer.Mode.OUTPUT));

        buffer.setInputMode();
        buffer.ensureCapacity(22);
        buffer.buffer().put(new byte[] { 0, 1, 2, 3, 4, 5});
        MatcherAssert.assertThat(buffer.length(), CoreMatchers.equalTo(22));
        MatcherAssert.assertThat(buffer.buffer().capacity(), CoreMatchers.equalTo(22));
        MatcherAssert.assertThat(buffer.mode(), CoreMatchers.equalTo(ExpandableBuffer.Mode.OUTPUT));

        buffer.clear();
        MatcherAssert.assertThat(buffer.mode(), CoreMatchers.equalTo(ExpandableBuffer.Mode.INPUT));
        MatcherAssert.assertThat(buffer.hasData(), CoreMatchers.equalTo(false));
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(22));
    }

    @Test
    public void testAdjustCapacity() throws Exception {
        final ExpandableBuffer buffer = new ExpandableBuffer(16);
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(16));

        buffer.ensureCapacity(21);
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(21));
        buffer.ensureAdjustedCapacity(22);
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(1024));
        buffer.ensureAdjustedCapacity(1024);
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(1024));
        buffer.ensureAdjustedCapacity(1025);
        MatcherAssert.assertThat(buffer.capacity(), CoreMatchers.equalTo(2048));
    }
}