Test Automation Levels Questions

Covers the testing pyramid and the roles of different automated test types: unit tests for fast isolated verification of individual components, integration tests for validating interactions between multiple components, system tests for end to end verification of a complete deployed system, and acceptance tests for confirming that the system meets user requirements. Includes trade offs in distribution and cost of tests, strategies for test data management and environment provisioning, when to use mocks or stubs, approaches to reduce flakiness, metrics for test coverage and effectiveness, maintaining fast feedback loops in continuous integration pipelines, and selecting tools and frameworks appropriate to each level.