package model.asn1;

import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

public class NullTest {
    @Test
    void testConstructor() {
        assertEquals(Null.TAG, new Null(Null.TAG, null).getTag());
        assertEquals(0x01,
                new Null(Null.TAG, new Tag(TagClass.CONTEXT_SPECIFIC, true, 0x01)).getParentTag().getNumber());
    }

    @Test
    void testEncode() {
        assertEquals(0, new Null(Null.TAG, null).encodeValueDER().length);
        assertArrayEquals(new Byte[] {
                0x5, 0x0 // Tag - Length
        }, new Null(Null.TAG, null).encodeDER());
    }

    @Test
    void testParse() throws ParseException {
        new Null(new BytesReader(new Byte[]{ 0x5, 0x0 }), false);
        new Null(new BytesReader(new Byte[]{ -95, 2, 0x5, 0x0 }), true);
    }

    @Test
    void testParseFail() {
        assertThrows(ParseException.class, () ->
                new Null(new BytesReader(new Byte[]{ 0x5, 0x2 }), false));
        assertThrows(ParseException.class, () ->
                new Null(new BytesReader(new Byte[]{ 0x5, 0x2, 1, 1 }), false));
    }
}