Resistance is futile mocks will be assimilated

[email protected] - 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


http://www.lordofthejars



Mocks ?

Fast





Mocks ?

Fast

Interface





Mocks ?

Fast

Interface

70% Test Code





Mocks ?

Fast

Interface

70% Test Code

Hard to Maintain





Mocks ?

Fast

Interface

70% Test Code

Hard to Maintain

Container services





Mocks ?

Fast

Interface

70% Test Code

Hard to Maintain

Container services

Uncertainty





Mocks ?

Fast

Interface

70% Test Code

Hard to Maintain

Container services

Uncertainty

Duplication





Mocks ?Kno

w Your

Enem

y?





Java EE Scenario

Client Protocol

{text/html}

{app/json}{app/xml}

Server External

{app/json}





High Level Tests

We D

on’t H

ave Tim

e





Low Level Tests

State Of The Union





Data Layer

Mock DAOs





Data Layer

Mock DAOs

Fast

Isolated





Data Layer

Mock DAOs

Fast

Isolated

ORM Mapping

ORM Configuration

Queries





Data Layer

Fast





Data Layer

Isolated





Data Layer

Isolated

Define base data set

CLEAN

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}





E-mail

Mock E-mail access





E-mail

Mock E-mail access

Fast

Offline





E-mail

Mock E-mail access

Fast

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("[email protected]").addTo("[email protected]")! ! ! ! .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"));! !}




mailto:[email protected]





REST

Mock REST access





REST

Mock REST access

Fast

Offline





REST

Mock REST access

Fast

Offline

Full Call Stack





REST

Stubbing Web Services





REST

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));! !}




http://localhost:8089

http://localhost:8089


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

UI code

DOM Manipulation

Ajax

Widgets





UI

Drives the browser

Access web elements





UI

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"));





UI

Arquillian Drone/Graphene

Sexy WebDriver API

Ajax-enabled

PageObjects

JQuery selectors

Call Javascript as Java





UI

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);}





Continuous Integration/Delivery

Continuous Integration / Delivery







Commit Stage







Commit Stage

Mock Expensive Operations







Commit Stage


Monitor Tests







Commit Stage


Monitor Tests

Bye Bye Uncertainty





Recap





Recap

Mock is an option, not a rule





Recap


Tests are first citizens





Recap



Don’t let mocks ruin your quality





Recap




Remember TDD





Recap




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




http://www.lordofthejars.com

http://www.lordofthejars.com

Resistance is futile mocks will be assimilated

Technology

Transcript of Resistance is futile mocks will be assimilated