Resistance is futile mocks will be assimilated

transcript

asotobu@gmail.com - Everis

Alex Soto

Resistance is Futile, Mocks Will be Assimilated

viernes 18 de octubre de 13

www.lordofthejars - @alexsotobAlex Soto

Mocks ?

Mocks are objects pre-programmed with expectations

Mocks ?

Mocks are objects pre-programmed with expectations

Mocks ?

Interface

Mocks ?

Interface

70% Test Code

Mocks ?

Interface

70% Test Code

Hard to Maintain

Mocks ?

Interface

70% Test Code

Hard to Maintain

Container services

Mocks ?

Interface

70% Test Code

Hard to Maintain

Container services

Uncertainty

Mocks ?

Interface

70% Test Code

Hard to Maintain

Container services

Uncertainty

Duplication

Mocks ?Kno

w Your

Java EE Scenario

Client Protocol

{text/html}

{app/json}{app/xml}

Server External

{app/json}

High Level Tests

on’t H

ave Tim

Low Level Tests

State Of The Union

Data Layer

Mock DAOs

Data Layer

Mock DAOs

Isolated

Data Layer

Mock DAOs

Isolated

ORM Mapping

ORM Configuration

Queries

Data Layer

Isolated

Data Layer

Isolated

Data Layer

Isolated

Define base data set

INSERT

Data Layer

{! "Book":! ! ! [! ! ! ! {"title":"The Hobbit","numberOfPages":293}! ! ! ]}

@Rulepublic MongoDbRule remoteMongoDbRule = newMongoDbRule().defaultManagedMongoDb("db");

@Test@UsingDataSet(locations="data.json",loadStrategy=LoadStrategyEnum.CLEAN_INSERT)@ShouldMatchDataSet(location="expectedData.json")public void book_should_be_inserted_into_repository() {

//test}

Data Layer

//test}

Data Layer

//test}

Data Layer

//test}

E-mail

Mock E-mail access

E-mail

Mock E-mail access

Offline

E-mail

Mock E-mail access

Offline

javax.mail

E-mail

SMTPMailService.sendMail(MailMessageBuilder$MailMessage) Transport.send(Message) Transport.send0(Message, Address[]) SMTPTransport.sendMessage(Message, Address[]) MimeMessage.writeTo(OutputStream, String[]) MimeBodyPart.writeTo(MimePart, OutputStream, String[])

E-mail

Embeddable SMTP server

E-mail

private static final int SMTP_PORT = 2500;private static Wiser mailServer = new Wiser();

@BeforeClasspublic static void startWiser() {! mailServer.setPort(SMTP_PORT);! mailServer.start();}

@AfterClasspublic static void stopWiser() {! mailServer.stop();}

@Testpublic void an_email_should_be_sent() throws MessagingException, IOException {

! MailMessage message = mail().from("me@mail.com").addTo("you@mail.com")! ! ! ! .contentType("text/plain").subject("Welcome")! ! ! ! .body("Welcome to our site, thanks for registering on it.")! ! ! ! .build();

! SMTPMailService smtpMailService = getMailService();! smtpMailService.sendMail(message);

! WiserMessage sentMessage = getSentMessage();! !! String subject = sentMessage.getMimeMessage().getSubject();! assertThat(subject, is("Welcome"));! !}

E-mail

Mock REST access

Offline

Mock REST access

Offline

Full Call Stack

Stubbing Web Services

private static final String URL = "http://localhost:8089";

@Rulepublic WireMockRule wireMockRule = new WireMockRule(8089);!@Testpublic void issues_from_project_should_be_retrieved() {! !! givenThat(get(urlEqualTo("/repos/lordofthejars/nosqlunit/issues"))! ! .willReturn(aResponse() .withHeader("Content-Type", "application/json") .withBody(GET_RESPONSE_JSON))! );! !! GithubClient githubClient = new GithubClient(URL);! !! String issues = githubClient.invokeGetMethod("/repos/lordofthejars/nosqlunit/issues");

! //could be an object assertThat(issues, is(GET_RESPONSE_JSON));! !}

Container

Code Runs in Container

Container

Code Runs in Container

CDI (Qualifiers, Produces, Alternatives, Decorators)

JPA (EntityManager, Transactions, Mapping)

Security

JSF (Conversation Scope, Binding, Validation)

JAX-RS, JAX-WS, ...

Container

public class PaymentGateway {

@Inject @CreditCard PaymentProcessor paymentProcessor//...public void setPaymentProcessor(PaymentProcessor paymentProcessor) {...}

Are you sure it works?

Container

Brings tests to runtime

Container

Manage Lifecycle of Container

Container

Create/Deploy MicroDeployments

Container

Enriching Test Classes

Container

Run Tests Inside/Against Container

Container

Run Tests Inside/Against Container

IDE Friendly

Container

Alex Soto

Container

www.lordofthejars - @alexsotobSpeaker’s name

Slide’s title

Let’s see in Action

UI code

DOM Manipulation

Widgets

Drives the browser

Access web elements

driver.get(contextPath.toString()+"login.xhtml");! !WebElement username = driver.findElement(By.id("username"));WebElement password = driver.findElement(By.id("password"));WebElement submit = driver.findElement(By.id("submit"));! !username.sendKeys("aa");password.sendKeys("bb");! !submit.click();! !WebElement welcomeMessage = driver.findElement(By.id("welcomeMessage"));

assertThat(welcomeMessage.getText(), is("Welcome"));

driver.get(contextPath.toString()+"login.xhtml");! !WebElement username = driver.findElement(By.id("username"));WebElement password = driver.findElement(By.id("password"));WebElement submit = driver.findElement(By.id("submit"));! !username.sendKeys("aa");password.sendKeys("bb");! !submit.click();! !WebElement welcomeMessage = driver.findElement(By.id("welcomeMessage"));

assertThat(welcomeMessage.getText(), is("Welcome"));

Arquillian Drone/Graphene

Sexy WebDriver API

Ajax-enabled

PageObjects

JQuery selectors

Call Javascript as Java

Let’s see in Action

Faults

Mock Fauls

Faults

Mock Fauls

Race Conditions

Uncommon Exceptions

Faults

Mock Fauls

Race Conditions

Uncommon Exceptions

Test Until Last Line

Faults

Fault Injection

Modify Bytecode

Faults

@Test(expected = ”IOException.class”)@BMRule(! ! name="throw IOException writting content",! ! targetClass = "com.lordofthejars.byteman.util.FileUtils",! ! targetMethod = "createFileWithContent",! ! targetLocation = "CALL BufferedWriter.write(String)",! ! action = "throw new java.io.IOException()"! ! )public void an_exception_should_be_thrown() throws IOException {! !! BackupManager backupManager = createBackupManager();! !! backupManager.backupData("Hello World");! !}

public void createFileWithContent(File filename, String content) throws IOException {

! ! ! BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);! ! ! bufferedWriter.write(content);}

Faults

Continuous Integration/Delivery

Continuous Integration / Delivery

Commit Stage

Mock Expensive Operations

Commit Stage

Monitor Tests

Commit Stage

Monitor Tests

Bye Bye Uncertainty

Mock is an option, not a rule

Tests are first citizens

Don’t let mocks ruin your quality

Remember TDD

Long Live and Prosper to Tests

Engage

Contents

https://github.com/lordofthejars/foobank/

Questions?

Let the end of the world come tumbling down, I'll be the last man standing on the ground - Alive - MeatLoaf

Alex Sotowww.lordofthejars.com@alexsotob

Resistance is futile mocks will be assimilated

Technology