USING DOCKER FOR TESTING LEGACY

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Alex Soto

Red Hat Engineer www.lordofthejars.com @alexsotob

Who Am I?

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https://www.manning.com/books/testing-java-microservices

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Questions

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ENIAC

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Quality for your Customers

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Enable changeRefactor code

Validate functionalityThe right thing, and the thing right

Trust deployments

Testing

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What is Legacy Code?

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Old Code Needs To Be Maintained

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Apply Test First Strategies

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How To Start?

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Characterization Tests

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Tests By Division

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Testing Containers

docker build -t myorg/myservice:1.0.0 . docker run --rm -ti -p 8080:8080 myorg/myservice:1.0.0

docker-compose up

mvn clean test

docker-compose stop

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Docker Run

Docker Compose Run

Run tests

Stop Docker Containers

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Arquillian Cube DSL

@RunWith(SpringRunner.class) @SpringBootTest(classes = PingPongController.class, webEnvironment = RANDOM_PORT) @ContextConfiguration(initializers = PingPongSpringBootTest.Initializer.class) public class PingPongSpringBootTest {

@ClassRule public static ContainerDslRule redis = new ContainerDslRule("redis:3.2.6") .withPortBinding(6379); @Autowired TestRestTemplate restTemplate;

@Test public void should_get_data_from_redis() { }

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Spring Boot Test

Custom Initializer

Container Definitionpublic static class Initializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

@Override public void initialize(ConfigurableApplicationContext configurableApplicationContext) {

EnvironmentTestUtils.addEnvironment("testcontainers", configurableApplicationContext.getEnvironment(), "spring.redis.host=" + redis.getIpAddress(), "spring.redis.port=" + redis.getBindPort(6379) );

Sets Container Environment

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Arquillian Cube Example@RunWith(Arquillian.class) public class HelloWorldTest {

@ArquillianResource @DockerUrl(containerName = "helloworld", exposedPort = 8080) RequestSpecBuilder requestSpecBuilder;

@Test public void should_receive_ok_message() { RestAssured .given() .spec(requestSpecBuilder.build()) .when() .get() .then() .assertThat().body("status", equalTo("OK")); }

}

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Arquillian Runner

REST-Assured Integration Environment Resolver

Normal REST-Assured Call

helloworld: image: jonmorehouse/ping-pong ports: - "8080:8080"

src/test/docker/docker-compose.yml

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DEMO

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Persistence Tests

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APE

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APE SQL example

@Rule public ArquillianPersistenceRule arquillianPersistenceRule = new ArquillianPersistenceRule(); @DbUnit @ArquillianResource RdbmsPopulator rdbmsPopulator;

@Before public void populateData() { // Given: rdbmsPopulator.forUri(jdbcUri).withDriver(Driver.class).withUsername("sa") .withPassword("").usingDataSet("composers.yml") .execute();

}

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APE JUnit Rule (not necessary with Arquillian Runner)

Set DBUnit usage

Configure Connection and Dataset

Populate

composers:

- id: 1 name: Wolfgang Amadeus Mozart birthdate: 27/1/1756 died: 5/12/1791

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APE SQL example

@After public void clean_database() { // Given: rdbmsPopulator.forUri(jdbcUri).withDriver(Driver.class).withUsername("sa") .withPassword("").usingDataSet("composers.yml") .clean(); }

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Clean After Test

Clean Database

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Boilerplate Code

Programmatic/Declarative@UsingDataSet/@ShouldMatchDataSet

SQL SupportDBUnit and Flyway

REST API SupportPostman Collections

NoSQL SupportMongoDB, Couchbase, CouchDB, Vault, Redis, Infinispan

Benefits of Arquillian APE

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DEMO

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Visual Testing

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Selenium

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Arquillian Drone

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Arquillian Drone example

@RunWith(Arquillian.class) public class LoginScreenTest { @Drone private WebDriver browser; @Test public void should_login_user() { driver.get("www.mypage.com/login"); driver.findElement(By.id("loginForm:login")).click(); } }

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Arquillian Runner

Injection of WebDriver instance

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Arquillian Graphene

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Arquillian Graphene Page Object example

@Location("login.xhtml") public class HomePage {

@Page private UserPage userPage;

@FindBy(id = "submit") private WebElement submitButton;

@FindBy(id = "form") private LoginPopup loginPopup;

// methods

}

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Location of the page

Another Page Object

Find web element by id

Page fragment

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Arquillian Graphene example

@RunWith(Arquillian.class) public class LoginTest {

@Drone WebDriver webDriver;

@Test public void should_create_a_new_speaker(@InitialPage HomePage homePage) { homePage.login("username", "pasword"); } }

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Open given page

Use Page Object method

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Docker and Selenium

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DEMO

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Let’s Wind Down

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Automate Everything

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Thank You

https://github.com/lordofthejars/conference-testbed

https://github.com/lordofthejars/jpa-onetomany-springboot-maven-mysql