test/jdk/java/util/zip/ZipFile/ReleaseInflater.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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/* @test
 * @bug 4214795
 * @summary Make sure the same inflater will only be recycled
 *          once.
 * @run junit ReleaseInflater
 */

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class ReleaseInflater {

    // ZIP file produced in this test
    private Path zip = Path.of("release-inflater.zip");

    /**
     * Create a sample ZIP file for use by tests
     * @param name name of the ZIP file to create
     * @return a sample ZIP file
     * @throws IOException if an unexpected IOException occurs
     */
    @BeforeEach
    public void setUp() throws IOException {
        try (ZipOutputStream zo = new ZipOutputStream(Files.newOutputStream(zip))) {
            zo.putNextEntry(new ZipEntry("file.txt"));
            zo.write("helloworld".getBytes(StandardCharsets.UTF_8));
        }
    }

    /**
     * Delete the ZIP and JAR files produced after each test method
     * @throws IOException if an unexpected IOException occurs
     */

    @AfterEach
    public void cleanup() throws IOException {
        Files.deleteIfExists(zip);
    }

    /**
     * Verify that the same Inflater is not recycled across input streams
     * @throws IOException if an unexpected IOException occurs
     */
    @Test
    public void recycleInflaterOnlyOnce() throws IOException {
        try (ZipFile zf = new ZipFile(zip.toFile())) {
            ZipEntry e = zf.getEntry("file.txt");

            InputStream in1 = zf.getInputStream(e);
            // close the stream, the inflater will be released
            in1.close();
            // close the stream again, should be no-op
            in1.close();

            // create two new streams, allocating inflaters
            InputStream in2 = zf.getInputStream(e);
            InputStream in3 = zf.getInputStream(e);

            // check to see if they influence each other
            assertEquals(in2.read(), in3.read(), "Stream is corrupted!");
        }
    }
}