*/
    public static byte[] readUnparsedTagged(final int expectTag, final int limit, final ASN1InputStream in) throws IOException {
        final int ftag = in.read();
        final int tag = readTagNumber(in, ftag);
        if (tag != expectTag) {
            throw new IOException("Unexpected tag " + tag);
        }
        final int length = readLength(in, limit, false);

        }, "Should throw IOException for unexpected tag");
    }

    // --- readTagNumber ---

    @Test
    void testReadTagNumber_Simple() throws IOException {
        // Simple tag 5
        InputStream s = new ByteArrayInputStream(new byte[] {});
        int tagNo = ASN1Util.readTagNumber(s, 0x05);
        assertEquals(5, tagNo);
    }

    @Test