test/jdk/java/lang/module/ClassFileVersionsTest.java

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/**
 * @test
 * @modules java.base/jdk.internal.module
 * @run testng ClassFileVersionsTest
 * @summary Test parsing of module-info.class with different class file versions
 */

import java.lang.module.InvalidModuleDescriptorException;
import java.lang.module.ModuleDescriptor;
import java.lang.module.ModuleDescriptor.Requires.Modifier;
import java.nio.ByteBuffer;
import java.util.Set;

import static java.lang.module.ModuleDescriptor.Requires.Modifier.*;

import jdk.internal.module.ModuleInfoWriter;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class ClassFileVersionsTest {

    // major, minor, modifiers for requires java.base
    @DataProvider(name = "supported")
    public Object[][] supported() {
        return new Object[][]{
                { 53,   0,  Set.of() },                      // JDK 9
                { 53,   0,  Set.of(STATIC) },
                { 53,   0,  Set.of(TRANSITIVE) },
                { 53,   0,  Set.of(STATIC, TRANSITIVE) },

                { 54,   0,  Set.of() },                      // JDK 10
        };
    }

    // major, minor, modifiers for requires java.base
    @DataProvider(name = "unsupported")
    public Object[][] unsupported() {
        return new Object[][]{
                { 50,   0,  Set.of()},                       // JDK 6
                { 51,   0,  Set.of()},                       // JDK 7
                { 52,   0,  Set.of()},                       // JDK 8

                { 54,   0,  Set.of(STATIC) },                // JDK 10
                { 54,   0,  Set.of(TRANSITIVE) },
                { 54,   0,  Set.of(STATIC, TRANSITIVE) },

                { 55,   0,  Set.of()},                       // JDK 11
        };
    }

    @Test(dataProvider = "supported")
    public void testSupported(int major, int minor, Set<Modifier> ms) {
        ModuleDescriptor descriptor = ModuleDescriptor.newModule("foo")
                .requires(ms, "java.base")
                .build();
        ByteBuffer bb = ModuleInfoWriter.toByteBuffer(descriptor);
        classFileVersion(bb, major, minor);
        descriptor = ModuleDescriptor.read(bb);
        assertEquals(descriptor.name(), "foo");
    }

    @Test(dataProvider = "unsupported",
          expectedExceptions = InvalidModuleDescriptorException.class)
    public void testUnsupported(int major, int minor, Set<Modifier> ms) {
        ModuleDescriptor descriptor = ModuleDescriptor.newModule("foo")
                .requires(ms, "java.base")
                .build();
        ByteBuffer bb = ModuleInfoWriter.toByteBuffer(descriptor);
        classFileVersion(bb, major, minor);

        // throws InvalidModuleDescriptorException
        ModuleDescriptor.read(bb);
    }

    private void classFileVersion(ByteBuffer bb, int major, int minor) {
        bb.putShort(4, (short) minor);
        bb.putShort(6, (short) major);
    }
}