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# Testing Libraries
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Testing frameworks, mocking libraries, and test containers with Spring Boot test integration. These libraries provide comprehensive testing capabilities for unit, integration, and end-to-end testing.
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## Capabilities
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### Core Testing Frameworks
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Fundamental testing frameworks with managed versions and Spring integration.
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```gradle { .api }
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// JUnit Jupiter (JUnit 5)
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'org.junit.jupiter:junit-jupiter'                        // 5.12.2
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'org.junit.jupiter:junit-jupiter-api'                    // 5.12.2
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'org.junit.jupiter:junit-jupiter-engine'                 // 5.12.2
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'org.junit.jupiter:junit-jupiter-params'                 // 5.12.2
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// JUnit Platform
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'org.junit.platform:junit-platform-engine'              // 1.11.3
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'org.junit.platform:junit-platform-launcher'            // 1.11.3
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'org.junit.platform:junit-platform-commons'             // 1.11.3
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// JUnit 4 (legacy support)
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'junit:junit'                                            // 4.13.2
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// TestNG alternative
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// Note: TestNG not included in Spring Boot Dependencies BOM
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```
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### Mocking and Stubbing
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Mocking frameworks for unit testing with dependency isolation.
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```gradle { .api }
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// Mockito
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'org.mockito:mockito-core'                               // 5.15.0
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'org.mockito:mockito-junit-jupiter'                      // 5.15.0
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'org.mockito:mockito-inline'                             // 5.15.0
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// Additional mocking utilities
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'org.mockito:mockito-android'                            // 5.15.0
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'org.mockito:mockito-errorprone'                         // 5.15.0
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```
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### Assertion Libraries
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Fluent assertion libraries for readable test code.
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```gradle { .api }
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// AssertJ
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'org.assertj:assertj-core'                               // 3.26.3
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// Hamcrest matchers
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'org.hamcrest:hamcrest'                                  // 3.0
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'org.hamcrest:hamcrest-core'                             // 3.0
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'org.hamcrest:hamcrest-library'                          // 3.0
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// JSON assertions
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'org.skyscreamer:jsonassert'                             // 1.5.3
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// XML assertions
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'org.xmlunit:xmlunit-core'                               // 2.10.2
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'org.xmlunit:xmlunit-matchers'                           // 2.10.2
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'org.xmlunit:xmlunit-assertj'                            // 2.10.2
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```
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### Spring Boot Testing
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Spring Boot-specific testing support and auto-configuration.
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```gradle { .api }
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// Spring Boot test starter (includes JUnit, Mockito, AssertJ, Spring Test)
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'org.springframework.boot:spring-boot-starter-test'      // 3.5.3
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// Spring Boot test framework
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'org.springframework.boot:spring-boot-test'              // 3.5.3
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'org.springframework.boot:spring-boot-test-autoconfigure' // 3.5.3
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// Testcontainers integration
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'org.springframework.boot:spring-boot-testcontainers'    // 3.5.3
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```
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### Container Testing
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Integration testing with real services using containers.
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```gradle { .api }
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// Testcontainers core
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'org.testcontainers:testcontainers'                      // 1.21.2
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'org.testcontainers:junit-jupiter'                       // 1.21.2
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// Database containers
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'org.testcontainers:postgresql'                          // 1.21.2
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'org.testcontainers:mysql'                               // 1.21.2
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'org.testcontainers:mariadb'                             // 1.21.2
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'org.testcontainers:mssqlserver'                         // 1.21.2
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'org.testcontainers:oracle-xe'                           // 1.21.2
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'org.testcontainers:oracle-free'                         // 1.21.2
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// NoSQL containers
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'org.testcontainers:mongodb'                             // 1.21.2
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'org.testcontainers:neo4j'                               // 1.21.2
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'org.testcontainers:cassandra'                           // 1.21.2
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'org.testcontainers:couchbase'                           // 1.21.2
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'org.testcontainers:elasticsearch'                       // 1.21.2
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'org.testcontainers:clickhouse'                          // 1.21.2
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// Message broker containers
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'org.testcontainers:kafka'                               // 1.21.2
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'org.testcontainers:rabbitmq'                            // 1.21.2
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'org.testcontainers:pulsar'                              // 1.21.2
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'org.testcontainers:activemq'                            // 1.21.2
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'org.testcontainers:redpanda'                            // 1.21.2
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// Cache and data store containers
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'com.redis:testcontainers-redis'                         // 2.2.4
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'org.testcontainers:r2dbc'                               // 1.21.2
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// Observability containers
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'org.testcontainers:grafana'                             // 1.21.2
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// JDBC URL support
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'org.testcontainers:jdbc'                                // 1.21.2
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```
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### Web Testing
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Web layer testing with mock servers and browser automation.
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```gradle { .api }
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// Spring MVC Test
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'org.springframework:spring-test'                        // 6.2.8
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// WebTestClient (for reactive web testing)
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'org.springframework:spring-webflux'                     // 6.2.8
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// REST API testing
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'io.rest-assured:rest-assured'                           // 5.5.5
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'io.rest-assured:json-path'                              // 5.5.5
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'io.rest-assured:xml-path'                               // 5.5.5
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'io.rest-assured:json-schema-validator'                  // 5.5.5
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// Mock web server
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'com.squareup.okhttp3:mockwebserver'                     // (managed via other dependencies)
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// Headless browser testing
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'org.htmlunit:htmlunit'                                  // 4.11.1
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// Selenium WebDriver
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'org.seleniumhq.selenium:selenium-java'                  // 4.31.0
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'org.seleniumhq.selenium:selenium-chrome-driver'         // 4.31.0
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'org.seleniumhq.selenium:selenium-firefox-driver'        // 4.31.0
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'org.seleniumhq.selenium:selenium-edge-driver'           // 4.31.0
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'org.seleniumhq.selenium:selenium-safari-driver'         // 4.31.0
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'org.seleniumhq.selenium:htmlunit3-driver'               // 4.30.0
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```
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### Asynchronous Testing
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Testing support for asynchronous and reactive code.
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```gradle { .api }
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// Awaitility (async testing utilities)
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'org.awaitility:awaitility'                              // 4.2.2
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'org.awaitility:awaitility-groovy'                       // 4.2.2
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'org.awaitility:awaitility-kotlin'                       // 4.2.2
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// Reactor Test
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'io.projectreactor:reactor-test'                         // (managed via reactor-bom)
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// Spring Test reactive support  
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'org.springframework:spring-webflux'                     // 6.2.8
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```
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### Framework-Specific Testing
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Testing support for specific frameworks and technologies.
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```gradle { .api }
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// Spring Security testing
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'org.springframework.security:spring-security-test'      // 6.5.1
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// Spring Data testing
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'org.springframework.data:spring-data-commons'           // 3.4.1
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// Spring Batch testing
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'org.springframework.batch:spring-batch-test'            // 5.2.2
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// Spring Integration testing
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'org.springframework.integration:spring-integration-test' // 6.5.0
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// Spring AMQP testing
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'org.springframework.amqp:spring-rabbit-test'            // 3.2.5
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// Spring Kafka testing
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'org.springframework.kafka:spring-kafka-test'            // 3.3.7
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// GraphQL testing
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'org.springframework.graphql:spring-graphql-test'        // 1.4.0
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```
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## Usage Examples
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### Basic Unit Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    // Includes: JUnit Jupiter, Mockito, AssertJ, Spring Test, JSONassert, Hamcrest
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}
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```
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### Integration Testing with Testcontainers
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.springframework.boot:spring-boot-testcontainers'
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    testImplementation 'org.testcontainers:junit-jupiter'
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    testImplementation 'org.testcontainers:postgresql'
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}
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```
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### Web Layer Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'io.rest-assured:rest-assured'
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    testImplementation 'org.htmlunit:htmlunit'
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}
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```
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### Reactive Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-webflux'
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    implementation 'org.springframework.boot:spring-boot-starter-data-r2dbc'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'io.projectreactor:reactor-test'
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    testImplementation 'org.awaitility:awaitility'
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}
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```
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### Security Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    implementation 'org.springframework.boot:spring-boot-starter-security'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.springframework.security:spring-security-test'
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}
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```
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### Message Broker Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-amqp'
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    implementation 'org.springframework.kafka:spring-kafka'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.springframework.boot:spring-boot-testcontainers'
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    testImplementation 'org.testcontainers:rabbitmq'
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    testImplementation 'org.testcontainers:kafka'
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    testImplementation 'org.springframework.amqp:spring-rabbit-test'
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    testImplementation 'org.springframework.kafka:spring-kafka-test'
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}
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```
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### Browser Testing with Selenium
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-web'
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    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.seleniumhq.selenium:selenium-java'
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    testImplementation 'org.seleniumhq.selenium:selenium-chrome-driver'
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    testImplementation 'org.testcontainers:selenium'
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}
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```
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### Multi-Database Testing
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```gradle
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dependencies {
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    implementation platform('org.springframework.boot:spring-boot-dependencies:3.5.3')
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    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
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    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
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    implementation 'org.springframework.boot:spring-boot-starter-data-redis'
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    testImplementation 'org.springframework.boot:spring-boot-starter-test'
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    testImplementation 'org.springframework.boot:spring-boot-testcontainers'
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    testImplementation 'org.testcontainers:junit-jupiter'
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    testImplementation 'org.testcontainers:postgresql'
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    testImplementation 'org.testcontainers:mongodb'
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    testImplementation 'com.redis:testcontainers-redis'
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}
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```