@Test
public void testBirdWalkingIsSame() {
// Find the animals in the wild.
Animal animal = new Animal();
Bird bird = new Bird();
// Observe the way they walk.
animal.walk();
bird.walk();
// If they walk the same, maybe they are the same.
String[] actual = stdout.toString().split("\n");
assertEquals(actual[0], actual[1]);
}
public static void main(String args[]) {
Bird bird = new Bird();
bird.walk();
bird.fly();
bird.sing();
}