package com.loomcom.symon;

import org.junit.*;

import com.loomcom.symon.devices.Acia;
import com.loomcom.symon.exceptions.FifoUnderrunException;

import static org.junit.Assert.*;

public class AciaTest {
    @Test
    public void newAciaShouldHaveTxEmptyStatus() throws Exception {
        Acia acia = new Acia(0x000);

        assertEquals(0x10, acia.read(0x0001));
    }

    @Test
    public void aciaShouldHaveTxEmptyStatusOffIfTxHasData() throws Exception {
        Acia acia = new Acia(0x000);

        acia.txWrite('a');
        assertEquals(0x00, acia.read(0x0001));
    }

    @Test
    public void aciaShouldHaveRxFullStatusOffIfRxHasData() throws Exception {
        Acia acia = new Acia(0x000);

        acia.rxWrite('a');
        assertEquals(0x18, acia.read(0x0001));
    }

    @Test
    public void aciaShouldHaveTxEmptyAndRxFullStatusOffIfRxAndTxHaveData()
            throws Exception {
        Acia acia = new Acia(0x000);

        acia.rxWrite('a');
        acia.txWrite('b');

        assertEquals(0x08, acia.read(0x0001));
    }

    @Test
    public void readingBuffersShouldResetStatus()
            throws Exception {
        Acia acia = new Acia(0x0000);

        acia.rxWrite('a');
        acia.txWrite('b');


        assertEquals(0x08, acia.read(0x0001));

        assertEquals('a', acia.rxRead());
        assertEquals('b', acia.txRead());

        assertEquals(0x10, acia.read(0x0001));
    }
}