test/jdk/java/io/File/LastModifiedTest.java

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import org.testng.annotations.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.time.Instant;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotEquals;

/**
 * @test
 * @library ..
 * @run testng LastModifiedTest
 * @summary Test to validate that java.nio.Files returns the same value
 * as java.io.File
 */
public class LastModifiedTest {

    private static final Instant MILLISECOND_PRECISION = Instant.ofEpochMilli(1999L);

    @Test
    public void verifyLastModifiedTime() throws IOException {
        File tempFile = Files.createTempFile("MillisecondPrecisionTest", "txt").toFile();
        try {
            tempFile.setLastModified(MILLISECOND_PRECISION.toEpochMilli());

            long ioTimestamp = tempFile.lastModified();
            long nioTimestamp = Files.getLastModifiedTime(tempFile.toPath()).toMillis();

            assertEquals(ioTimestamp, nioTimestamp);
        } finally {
            tempFile.delete();
        }

    }
}