TimeImmutabilityTest.java

package org.tomighty.time;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotSame;

public class TimeImmutabilityTest {
    
    @Test                           
    public void subtractingOneSecond() {
        Time originalTime = Time.seconds(9);
        Time resultingTime = originalTime.minusOneSecond();

        assertNotSame("Returns new instance of Time", resultingTime, originalTime);
        assertEquals("Original time did not change", 9, originalTime.seconds());
    }
    
    
}