JUnit 5 and TestNG Test

This sub-skill evaluates the candidate's proficiency in executing test cases and debugging any issues that arise during the testing process. It is essential to assess this skill to ensure that the candidate can effectively identify and resolve defects, ensuring the reliability and stability of the software.

This sub-skill assesses the candidate's ability to integrate JUnit with other testing frameworks or tools, such as build automation tools or continuous integration systems. Assessing this skill is crucial as it demonstrates the candidate's knowledge of seamless integration and automation, enhancing the efficiency and effectiveness of the testing process.

This sub-skill focuses on the candidate's understanding of using assertions and validating test results. It is important to assess this skill as it ensures that the candidate can accurately validate expected outcomes, enabling the identification of failures and discrepancies in the software's functionality.

This sub-skill evaluates the candidate's ability to effectively manage test data, including creating, modifying, and maintaining test data sets. Assessing this skill is crucial as it ensures that the candidate can generate comprehensive and diverse test scenarios, enhancing test coverage and accuracy.

This sub-skill assesses the candidate's proficiency in generating test reports and documenting test results, including defects and their resolutions. It is important to assess this skill as it ensures proper documentation and communication of testing activities, facilitating collaboration and decision-making during the software development process.

Data-driven tests with @ParameterizedTest; converters/providers; extension callbacks and global registration.

Suite XML, groups, dependencies, parameters, listeners/reporters, controlled parallel runs.

Effective isolation using mocks/spies/captors; stubbing, verification, and avoiding overspecification.

Controller slice tests with @WebMvcTest & MockMvc; JSON assertions, filters/interceptors, error handling.

AuthN/AuthZ testing with @WithMockUser, post-processors, CSRF, method security checks.

@DataJpaTest, transactional boundaries, entity mappings, embedded DB vs containerized DB.

Spinning DB/Redis/Kafka via Testcontainers; reusable/static containers; lifecycle and CI performance.

External HTTP stubs, verifications, retries/backoff tests; consumer–provider contract basics.

Testing async flows without sleeps; timeouts, aggregation, race-condition hygiene and diagnostics.

Surefire/Failsafe vs Gradle task separation, JUnit XML, sharding/parallelization and matrices.

Line vs branch coverage, meaningful assertions (AssertJ), naming/AAA/GWT, determinism patterns.

Clock abstraction, seeds, hermetic env, no shared state; CI-only failure triage and stabilization.

Using PIT to detect weak tests; interpreting surviving mutants; thresholds and incremental adoption.