For more information about testing, see the following sources:
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JUnit: "A programmer-friendly testing framework for Java." Used by the Spring Framework in its test suite and supported in Spring TestContext Framework.
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TestNG: JUnit-based testing framework with support for test groups, data-driven testing, distributed testing, and more . Supported in Spring TestContext Framework
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AssertJ: "Smoothly add assertions for Java" including support for lambdas, streams, and more Java 8 features.
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Mock Objects: Wikipedia article.
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MockObjects.com: Website dedicated to mock objects, a method for improving code structure in development via testing.
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Mockito: Java mock object library based on the Test Spy. Used by the Spring Framework in its test suite.
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EasyMock: A Java library "that provides mock objects for interfaces (and objects via class extension) by generating them on the fly using the proxy mechanism in Java."
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JMock: A library that supports test-driven development of Java code using mock objects.
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DbUnit: A JUnit extension (also used with Ant and Maven) designed for projects built on top of databases, and which, among other things, brings your database into a normal state between test iterations.
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Testcontainers: Java library supporting tests from JUnit, providing lightweight, one-time instances of common databases, web -Selenium browsers and everything else that can be done in a Docker container.
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The Grinder: Java load testing framework.
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SpringMockK: A tool to support Spring Boot integration tests written in Kotlin using MockK instead of Mockito.