The Test Pyramid architecture pattern is a model that is used to optimize and streamline the testing process of software applications. It helps in creating a well-balanced approach towards testing with an emphasis on testing at all levels, starting from low-level unit tests to high-level end-to-end tests. The pyramid is divided into three layers:
1. Unit Tests: At the bottom of the pyramid, there are unit tests that test individual code components. These tests are executed frequently and fast, and they help in catching issues early in the development cycle.
2. Integration Tests: In the middle of the pyramid, there are integration tests that verify the communication between different components of the system. They are executed less frequently than unit tests, but they provide valuable feedback regarding the overall health of the system.
3. End-to-End Tests: At the top of the pyramid, there are end-to-end tests that test the entire system's functionality from the user's perspective. These tests are executed even less frequently than integration tests, but they help in catching issues that may not be picked up by the lower-level tests.
The test pyramid helps in achieving better test coverage, reducing the risk of defects, and improving the overall quality of the software application.
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