Spock - the next stage of unit testing

Spock
The next state of Unit testing

Agenda
● Unit testing
● What is Spock

Agenda
● Unit testing
● What is Spock
● Why

Agenda
● Unit testing
● What is Spock
● Why
● Demo

Agenda
● Unit testing
● What is Spock
● Why
● Demo
● Q&A

Main thoughts
● Проверяем соответствие требованиям

Main thoughts
● Делаем быстро и точечно

Main thoughts
● Находим проблемы на раннем этапе

Main thoughts
● Проверяем, что ничего не сломали при изменении

Main thoughts
● Строим дизайн системы

Main thoughts
● Строим дизайн системы
● Документируем поведение системы

Typical Java Unit test
public class JUnitClassicStateResolverSpec {
@Test
public void classicStatesShouldUseGameRules() {
StateResolver scissorsResolver = new ScissorsStateResolver();
StateResolver rockResolver = new RockStateResolver();
StateResolver paperResolver = new PaperStateResolver();
assertEquals(false, scissorsResolver.tryToBeat(State.SPOCK));
assertEquals(true, scissorsResolver.tryToBeat(State.LIZARD));
assertEquals(true, scissorsResolver.tryToBeat(State.OUT));
assertEquals(true, scissorsResolver.tryToBeat(State.PAPER));
assertEquals(false, scissorsResolver.tryToBeat(State.ROCK));
assertEquals(false,
scissorsResolver.tryToBeat(State.SCISSORS));
assertEquals(false, rockResolver.tryToBeat(State.SPOCK));
assertEquals(false, rockResolver.tryToBeat(State.LIZARD));
assertEquals(true, rockResolver.tryToBeat(State.OUT));
assertEquals(false, rockResolver.tryToBeat(State.PAPER));
assertEquals(false, rockResolver.tryToBeat(State.ROCK));
assertEquals(true, rockResolver.tryToBeat(State.SCISSORS));
assertEquals(true, paperResolver.tryToBeat(State.SPOCK));
assertEquals(false, paperResolver.tryToBeat(State.LIZARD));
assertEquals(true, paperResolver.tryToBeat(State.OUT));
assertEquals(false, paperResolver.tryToBeat(State.PAPER));
assertEquals(true, paperResolver.tryToBeat(State.ROCK));
assertEquals(false, paperResolver.tryToBeat(State.SCISSORS));
}
}

Typical Java Unit test
classicStatesShouldUseGameRules(net.astanajug.meetup.spock.JUnitClassicStateResolverSpec) Time elapsed: 0.003 sec <<< FAILURE!
java.lang.AssertionError: expected:<false> but was:<true>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:118)
at org.junit.Assert.assertEquals(Assert.java:144)
at
net.astanajug.meetup.spock.JUnitClassicStateResolverSpec.classicStatesShouldUseGameRules(JUnitClassicStateResolverSpec.java:27
)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
+100500 stack trace lines
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)
+100500 stack trace lines

Spock - the next stage of unit testing

What is?
● Начат в 2008 году

What is?
● Создан Peter Niederweiser и поддерживается Luke Daley и
сообществом

What is?
● Разработан с использованием Groovy

What is?
● Базируется на идеях JUnit, jMock, Mockito, RSpec, JUnitParameters и
Start Trek

What is?
● Базируется на идеях JUnit, jMock, Mockito, RSpec, JUnitParameters и
Start Trek
● Первый “мажорный” релиз выпущен в 2015 году

Why?
● Совместим с JUnit

Why?
● Легко попробовать - http://webconsole.spockframework.org

Why?
● “Выразительная” конструкция построения теста - Given-When-Then

Given-When-Then example
def "A basket with one product has equal weight"() {
given: "an empty basket and a TV"
Product tv = new Product(name:"bravia",price:1200,weight:18)
Basket basket = new Basket()
when: "user wants to buy the TV"
basket.addProduct(tv)
then: "basket weight is equal to the TV"
basket.currentWeight == tv.weight
}

Why?
● Понятные сообщения об ошибках

Informative message example
import spock.lang.*
class MyFirstSpec extends
Specification {
def "let's try this!"() {
expect:
Math.max(1, 2) == 3
}
}
MyFirstSpec
- let's try this! FAILED
Condition not satisfied:
Math.max(1, 2) == 3
| |
2 false
at MyFirstSpec.let's try this!(Script1.groovy:7)

Why?
● Возможность тестирования взаимодействий через моки

Interaction testing example
def "credit card connection is always closed down"() {
given: "a basket, a customer and a TV"
Product tv = new Product(name:"bravia",price:1200,weight:18)
BillableBasket basket = new BillableBasket()
Customer customer = new Customer(...)
and: "a credit card service"
CreditCardProcessor creditCardSevice = Mock(CreditCardProcessor)
basket.setCreditCardProcessor(creditCardSevice)
when: "user checks out the tv"
basket.addProduct tv
basket.checkout(customer)
then: "connection is always closed at the end"
1 * creditCardSevice.shutdown()
}

Why?
● Возможность тестирования взаимодействий через моки
● Простота тестирования с использованием наборов данных

Data Driven example
class HelloSpock extends spock.lang.Specification {
def "length of Spock's and his friends' names"() {
expect:
name.size() == length
where:
name | length
"Spock" | 5
"Kirk" | 4
"Scotty" | 6
}
}

Resource
● http://spockframework.org
● http://webconsole.spockframework.org
● Java Testing with Spock by Konstantinos Kapelonis
(https://manning.com/books/java-testing-with-spock)

Spock - the next stage of unit testing

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