Arquillian vs Mockito: What are the differences?

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1. **Integration vs Unit Testing**: Arquillian is primarily used for integration testing, where the focus is on testing the interactions between multiple components in a real container environment. On the other hand, Mockito is a mocking framework used for unit testing, which involves isolating and testing individual components in isolation.
2. **Deployment**: Arquillian allows developers to deploy test archives to various containers at runtime, enabling the testing of code in a real-world environment. Mockito does not deal with deployment as it focuses on mocking behavior of objects and testing them in isolation without the need for a container.
3. **Real vs Mocked Objects**: When using Arquillian, developers work with real objects that are deployed in a container environment, allowing for end-to-end testing of the application. In contrast, Mockito creates mock objects that simulate the behavior of real objects, making it easier to focus on specific parts of the code.
4. **Scope of Testing**: Arquillian's scope extends to testing interactions between components, containers, and deployments, making it suitable for comprehensive integration testing scenarios. On the other hand, Mockito is mostly used for testing the behavior of individual units or components in isolation, making it more suitable for unit testing.
5. **Dependency on External Components**: Arquillian relies on actual containers and external resources to perform integration testing, which may require additional setup and configuration. Mockito, being a mocking framework, does not have dependencies on external components, making it easier to set up and run unit tests quickly.
6. **Purpose**: Arquillian is designed for developers who need to test the integration of various components in a real container environment, ensuring that the application behaves correctly in a deployed setup. Mockito, on the other hand, caters to developers who primarily focus on unit testing and mocking behaviors of objects to isolate and test specific parts of the code.

In Summary, Arquillian is focused on integration testing in real container environments, while Mockito is geared towards unit testing and mocking behaviors of objects in isolation.