java-topology/test/jdk/java/nio/file/Files/CallWithInterruptSet.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8205612
 * @run junit CallWithInterruptSet
 * @summary Test invoking Files methods with the interrupted status set
 */

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.nio.file.Files;
import java.nio.file.Path;

import org.junit.jupiter.api.Test;

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

public class CallWithInterruptSet {

    @Test
    public void testReadAllBytes() throws Exception {
        Path file = mkfile(100);
        Thread.currentThread().interrupt();
        try {
            byte[] bytes = Files.readAllBytes(file);
            assertEquals(100, bytes.length);
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
    }

    @Test
    public void testInputStream() throws IOException {
        Path file = mkfile(100);
        Thread.currentThread().interrupt();
        try (InputStream in = Files.newInputStream(file)) {
            int n = in.read(new byte[10]);
            assertTrue(n > 0);
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
    }

    @Test
    public void testOutputStream() throws Exception {
        Path file = mkfile();
        try (OutputStream out = Files.newOutputStream(file)) {
            Thread.currentThread().interrupt();
            out.write(new byte[10]);
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
        assertEquals(10, Files.size(file));
    }

    @Test
    public void testReadString() throws Exception {
        Path file = mkfile();
        Files.writeString(file, "hello");
        Thread.currentThread().interrupt();
        try {
            String msg = Files.readString(file);
            assertEquals("hello", msg);
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
    }

    @Test
    public void testWriteString() throws Exception {
        Path file = mkfile();
        Thread.currentThread().interrupt();
        try {
            Files.writeString(file, "hello");
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
        String msg = Files.readString(file);
        assertEquals("hello", msg);
    }

    @Test
    public void testBufferedReader() throws Exception {
        Path file = mkfile();
        Files.writeString(file, "hello");
        Thread.currentThread().interrupt();
        try (BufferedReader reader = Files.newBufferedReader(file)) {
            String msg = reader.readLine();
            assertEquals("hello", msg);
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
    }

    @Test
    public void testBufferedWriter() throws Exception {
        Path file = mkfile();
        Thread.currentThread().interrupt();
        try (BufferedWriter writer = Files.newBufferedWriter(file)) {
            writer.write("hello");
        } finally {
            assertTrue(Thread.interrupted());  // clear interrupt
        }
        String msg = Files.readString(file);
        assertEquals("hello", msg);
    }

    private Path mkfile() throws IOException {
        return Files.createTempFile(Path.of("."), "tmp", "tmp");
    }

    private Path mkfile(int size) throws IOException {
        return Files.write(mkfile(), new byte[size]);
    }

}