Testability and Testing Practices Questions

Emphasizes designing code for testability and applying disciplined testing practices to ensure correctness and reduce regressions. Topics include writing modular code with clear seams for injection and mocking, unit tests and integration tests, test driven development, use of test doubles and mocking frameworks, distinguishing meaningful test coverage from superficial metrics, test independence and isolation, organizing and naming tests, test data management, reducing flakiness and enabling reliable parallel execution, scaling test frameworks and reporting, and integrating tests into continuous integration pipelines. Interviewers will probe how candidates make code testable, design meaningful test cases for edge conditions, and automate testing in the delivery flow.

MediumTechnical

0 practiced

Describe how to write reliable end-to-end tests for a multi-step checkout flow that integrates payments, inventory, and shipping. Discuss test data management, environment isolation, when to stub external payments, and techniques to reduce flakiness such as stable selectors and retry strategies.

MediumSystem Design

0 practiced

Design a test-results reporting and metrics system for an organization that runs thousands of tests per day. What data will you collect (execution time, pass/fail, flakes, owners), what dashboards and alerts would you surface, and how would you help engineers find and fix flaky or failing tests quickly?

EasyTechnical

0 practiced

Describe fixture setup and teardown patterns in common test frameworks (pytest fixtures, JUnit @Before/@After, and setup/teardown functions). Explain when to use function, module, class, and session scopes and how to avoid expensive shared state causing flakiness.

MediumTechnical

0 practiced

Explain property-based testing and how it differs from example-based tests. Provide an example property that verifies a JSON serialize-deserialize round-trip maintains equality of the original object, and discuss pitfalls such as shrinking and generation limits.

MediumTechnical

0 practiced

Describe how to use a mocking framework such as Mockito to replace external dependencies in unit tests. Show examples of stubbing return values, verifying interaction counts, and using argument matchers. Then discuss the risks of over-mocking and tests that assert implementation details rather than behavior.

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