TestContainers
Testcontainers is a library designed to help with integration testing by leveraging Docker containers. Docker containers provide lightweight, isolated environments that can be easily spun up and torn down, making them ideal for testing purposes. Testcontainerssimplifies the process of managing docker containers within your tests, allowing you to seamlessly integrate them into your testing workflow.
In this example, Testcontainers automatically starts PostgreSQL and Redis containers before running the tests.
@TestcontainerspublicclassUserServiceIntegrationTest{@ContainerprivatestaticfinalPostgreSQLContainer<?>postgresContainer=newPostgreSQLContainer<>("postgres:latest");@ContainerprivatestaticfinalGenericContainer<?>redisContainer=newGenericContainer<>("redis:latest");@AutowiredprivateUserServiceuserService;@TestpublicvoidtestUserCreation(){// GivenUseruser=newUser("John Doe","john@example.com");// WhenuserService.createUser(user);// ThenUserretrievedUser=userService.getUserByEmail("john@example.com");assertNotNull(retrievedUser);assertEquals("John Doe",retrievedUser.getName());}}ArchUnit
Java library that allows developers to define and enforce architectural constraints within their codebase by writing unit tests. Lets see example:
We define an ArchUnit test to enforce a layered architecture. We specify three layers – Controller, Service, and Repository – and define rules governing their dependencies.
publicclassArchitectureTest{privatefinalJavaClassesclasses=newClassFileImporter().importPackages("com.example");@TestpublicvoidtestLayeredArchitecture(){ArchRulelayerDependencies=layeredArchitecture().layer("Controller").definedBy("com.example.controller..").layer("Service").definedBy("com.example.service..").layer("Repository").definedBy("com.example.repository..").whereLayer("Controller").mayNotBeAccessedByAnyLayer().whereLayer("Service").mayOnlyBeAccessedByLayers("Controller").whereLayer("Repository").mayOnlyBeAccessedByLayers("Service");layerDependencies.check(classes);}}DataFaker
Library designed to simplify the generation of realistic test data for use in software testing, prototyping, and development environments.
Features:
- Realistic Data Generation
- Customization Options
- Easy Integration
Example:
importcom.github.javafaker.Faker;publicclassUserGenerator{privatefinalFakerfaker;publicUserGenerator(){this.faker=newFaker();}publicUsergenerateUser(){StringfirstName=faker.name().firstName();StringlastName=faker.name().lastName();Stringemail=faker.internet().emailAddress();StringphoneNumber=faker.phoneNumber().cellPhone();Stringaddress=faker.address().fullAddress();returnnewUser(firstName,lastName,email,phoneNumber,address);}}Other mentions: Playwright - java framework for UI testing
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