test/jdk/tools/jlink/JLinkReproducible2Test.java

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import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.spi.ToolProvider;

/*
 * @test
 * @summary Make sure that jimages are consistent when created by jlink.
 * @bug 8241602
 * @modules jdk.jlink
 *          java.se
 *          jdk.management
 *          jdk.unsupported
 *          jdk.charsets
 * @run main JLinkReproducible2Test
 */
public class JLinkReproducible2Test {
    static final ToolProvider JLINK_TOOL = ToolProvider.findFirst("jlink")
            .orElseThrow(() ->
                    new RuntimeException("jlink tool not found")
            );

    public static void main(String[] args) throws Exception {
        Path image1 = Paths.get("./image1");
        Path image2 = Paths.get("./image2");

        JLINK_TOOL.run(System.out, System.err, "--add-modules", "java.se", "--output", image1.toString());
        JLINK_TOOL.run(System.out, System.err, "--add-modules", "java.se", "--output", image2.toString());

        if (Files.mismatch(image1.resolve("lib").resolve("modules"), image2.resolve("lib").resolve("modules")) != -1L) {
            throw new RuntimeException("jlink producing inconsistent result");
        }

        Path image3 = Paths.get("./image3");
        Path image4 = Paths.get("./image4");

        JLINK_TOOL.run(System.out, System.err, "--add-modules", "java.base,jdk.management,jdk.unsupported,jdk.charsets", "--output", image3.toString());
        JLINK_TOOL.run(System.out, System.err, "--add-modules", "java.base,jdk.management,jdk.unsupported,jdk.charsets", "--output", image4.toString());

        if (Files.mismatch(image3.resolve("lib").resolve("modules"), image4.resolve("lib").resolve("modules")) != -1L) {
            throw new RuntimeException("jlink producing inconsistent result with multiple named modules");
        }
    }
}