test/langtools/tools/javap/default_methods/JavapNotPrintingDefaultModifierTest.java

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/*
 * @test 8216261
 * @summary Javap ignores default modifier on interfaces
 * @library /tools/lib
 * @modules jdk.jdeps/com.sun.tools.javap
 * @build toolbox.ToolBox toolbox.JavapTask
 * @run main JavapNotPrintingDefaultModifierTest
 */

import java.nio.file.*;
import java.util.*;

import toolbox.JavapTask;
import toolbox.TestRunner;
import toolbox.ToolBox;
import toolbox.Task;

public class JavapNotPrintingDefaultModifierTest extends TestRunner {
    ToolBox tb = new ToolBox();

    interface SimpleInterface {
        default void defaultMethod() {}
        void foo();
    }

    private static final List<String> expectedOutput = List.of(
            "Compiled from \"JavapNotPrintingDefaultModifierTest.java\"",
            "interface JavapNotPrintingDefaultModifierTest$SimpleInterface {",
            "  public default void defaultMethod();",
            "  public abstract void foo();",
            "}");

    JavapNotPrintingDefaultModifierTest() throws Exception {
        super(System.err);
    }

    public static void main(String... args) throws Exception {
        JavapNotPrintingDefaultModifierTest tester = new JavapNotPrintingDefaultModifierTest();
        tester.runTests();
    }

    protected void runTests() throws Exception {
        runTests(m -> new Object[] { Paths.get(m.getName()) });
    }

    @Test
    public void testMain(Path base) throws Exception {
        Path testClassesPath = Paths.get(System.getProperty("test.classes"));
        List<String> output = new JavapTask(tb)
                .options("-p", testClassesPath.resolve(this.getClass().getSimpleName() + "$SimpleInterface.class").toString())
                .run()
                .writeAll()
                .getOutputLines(Task.OutputKind.DIRECT);
        System.out.println(output);
        if (!output.equals(expectedOutput)) {
            throw new AssertionError(String.format("unexpected output:\n %s", output));
        }
    }
}