public void performTest() throws Exception
    {
        X509ExtensionsGenerator gen = new X509ExtensionsGenerator();

        gen.addExtension(OID_1, true, new byte[20]);
        gen.addExtension(OID_2, true, new byte[20]);

        X509Extensions ext1 = gen.generate();
        X509Extensions ext2 = gen.generate();

        if (!ext1.equals(ext2))
        {
            fail("equals test failed");
        }

        gen.reset();

        gen.addExtension(OID_2, true, new byte[20]);
        gen.addExtension(OID_1, true, new byte[20]);

        ext2 = gen.generate();

        if (ext1.equals(ext2))
        {
            fail("inequality test failed");
        }

        if (!ext1.equivalent(ext2))
        {
            fail("equivalence true failed");
        }

        gen.reset();

        gen.addExtension(OID_1, true, new byte[22]);
        gen.addExtension(OID_2, true, new byte[20]);

        ext2 = gen.generate();

        if (ext1.equals(ext2))
        {
            fail("inequality 1 failed");
        }

        if (ext1.equivalent(ext2))
        {
            fail("non-equivalence 1 failed");
        }

        gen.reset();

        gen.addExtension(OID_3, true, new byte[20]);
        gen.addExtension(OID_2, true, new byte[20]);

        ext2 = gen.generate();

        if (ext1.equals(ext2))
        {
            fail("inequality 2 failed");
        }

        if (ext1.equivalent(ext2))
        {
            fail("non-equivalence 2 failed");
        }

        try
        {
            gen.addExtension(OID_2, true, new byte[20]);
            fail("repeated oid");
        }
        catch (IllegalArgumentException e)
        {
            if (!e.getMessage().equals("extension 1.2.2 already added"))
            {
                fail("wrong exception on repeated oid: " + e.getMessage());
            }
        }
    }