import static org.junit.Assert.*;
import org.junit.Test;
import org.apache.commons.lang.StringUtils;

/**
 *
 */

/**
 * @author einolfs
 *
 */
public class TestDifference {

    // Tests the difference method of StringUtils. //
    // Create three strings, add two together and test the difference //
    // between concatenated string and the third (differnce(a,a+b) //
    // should equal b //
    @Test
    public void testDifferceComparison() {
        String a = "The quick brown fox jumps over the lazy dog";
        String b = "The Cow Jumped Over the Moon";
        String c = a+b;
        assertEquals(StringUtils.difference(a,a+b),b);
    }

    // Tests that the difference between string a and null is //
    // equal to the string a //
    public void testDifferenceNull() {
        String a = "The quick brown fox jumps over the lazy dog";
        assertEquals(StringUtils.difference(a,null),a);
    }

}