package co.nstant.in.cbor.model;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

public class DataItemTest {

    private class TestDataItem extends DataItem {

        protected TestDataItem() {
            super(MajorType.INVALID);
        }

    }

    @Test(expected = NullPointerException.class)
    public void shouldThrowNullPointerException() {
        new DataItem(null);
    }

    @Test
    public void testSetTag_Long() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(1);
        assertNotNull(di.getTag());
    }

    @Test(expected = IllegalArgumentException.class)
    public void testSetTag_Long_negative() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(-1);
    }

    @Test
    public void testSetTag_Tag() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(new Tag(1));
        assertNotNull(di.getTag());
    }

    @Test(expected = NullPointerException.class)
    public void testSetTag_Tag_null() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(null);
    }

    @Test
    public void testGetTag() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(new Tag(1));

        Tag t = di.getTag();
        assertEquals(1L, t.getValue());
    }

    @Test
    public void testHasTag() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        assertFalse(di.hasTag());

        di.setTag(new Tag(1));
        assertTrue(di.hasTag());
    }

    @Test
    public void testRemoveTag() {
        DataItem di = new DataItem(MajorType.UNSIGNED_INTEGER);
        di.setTag(new Tag(1));
        assertNotNull(di.getTag());

        di.removeTag();
        assertNull(di.getTag());
    }

    @Test
    public void testEquals() {
        DataItem a = new TestDataItem();
        DataItem b = new TestDataItem();
        assertEquals(a, b);
        a.setTag(1);
        assertFalse(a.equals(b));
        assertFalse(a.equals(null));
    }

}