@Test
public void testPeek() throws Exception {
subject.add("cows");
subject.add("sheep");
subject.add("ducks");
subject.add("mice");
subject.add("dogs");
subject.add("cats");
subject.add("birds");
int size = subject.size();
Assert.assertEquals(7, size);
String animal = subject.peek();
Assert.assertEquals("cows", animal);
size = subject.size();
Assert.assertEquals(7, size);
}
