RomanTest.java

package com.example.roman;

import com.example.roman.Roman;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

/**
 * Created by danielvaughan on 09/10/2014.
 */
public class RomanTest {

    private Roman roman;

    @Before
    public void setup()
    {
        roman = new Roman();
    }

    @Test
    public void return_I_for_1()
    {
        String romanStr = roman.fromArabic(1);
        assertEquals("I", romanStr);
    }

    @Test
    public void return_II_for_2()
    {

        String romanStr = roman.fromArabic(2);
        assertEquals("II", romanStr);
    }

    @Test (expected = IllegalArgumentException.class)
    public void return_error_for_0()
    {
        String romanStr = roman.fromArabic(0);
    }

    @Test
    public void return_VII_for_7()
    {

        String romanStr = roman.fromArabic(7);
        assertEquals("VII", romanStr);
    }

    @Test
    public void return_XII_for_12()
    {
        return_correct_roman_value(12, "XII");
    }

    private void return_correct_roman_value(int arabic, String expectedRoman) {
        String romanStr = roman.fromArabic(arabic);
        assertEquals(expectedRoman, romanStr);
    }

    @Test
    public void return_LXVI_for_66() {
        return_correct_roman_value(66, "LXVI");
    }

    @Test
    public void return_MMM_for_3000() {
        return_correct_roman_value(3000, "MMM");
    }

    @Test
    public void return_DC_for_600() {
        return_correct_roman_value(600, "DC");
    }

    @Test
    public void return_DC_for_888() {
        return_correct_roman_value(888, "DCCCLXXXVIII");
    }

    @Test
    public void return_DC_for_444() {
        return_correct_roman_value(444, "CDXLIV");
    }

    @Test
    public void return_DC_for_256() {
        return_correct_roman_value(256, "CCLVI");
    }
}