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Published 1 year ago by Eric
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class Animal {

class Bear extends Animal {

Creating your own Objects and methods!

First we'll create a Bear object. The bear needs:
* a Name - what type should we use to store the name?)
* Offspring - what is a bear's offspring? How can we represent it?
* a function to tell if it's hibernating or not
* Says "GROWL!" when you call speak()
class ObjectSpec extends Specification {
    def "Testing the bear"() {
        when: "Create a Bear Class so the test passes:"

        then: "Only use the `when` block to make this pass"
        bear.name == "Scratchy"
        bear.speak() == "Growl!"
        bear.isHibernating() == false

        when: "Change the season to winter"
        bear.season //??

        then: "the bear is hibernating"
        bear.isHibernating() == true

    All animals have some things in common. Lets make an `Animal` class. Our Bear can `extend` the animal.

    Take the common aspects of animals (name, offspring) and move it to the Animal class - BUT keep the Bear test passing!
    def "Offspring"() {
        given: "Create a motherBear and cubs that will be the offspring"

        and: "We add all of the cubs to the offspring list"

        expect: "Mother bear has 2 cubs"
        motherBear.offspring.size() == 2

        and: "Her first born doesn't have any cubs"
        motherBear.offspring.first().offspring.size() == 0

What other aspects are common in animals? Mammals? Reptiles?
What about Flying? Both Mammals and Reptiles can fly. For those we can use a Trait:

trait FlyingAbility {
    String fly() { "I'm flying!" }

class Canary extends Animal implements FlyingAbility {
    def name = "Tweety"
    def speak() { "Tweet, tweet!" }

// Creat a test case to make this pass

class TraitSpec extends Specification {
    def "Ensure a bear can not fly"() { }
    def "A Canary can fly"() { }