Q1. What is the difference between unit, integration and end-to-end tests?
Unit tests exercise a single function, class or module in isolation, with dependencies replaced by fakes. They run in milliseconds, pinpoint failures and are cheap to wri...
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Q2. What makes a good unit test?
A good unit test is fast, deterministic, isolated and focused on behaviour. Characteristics: - Tests one behaviour, with a clear name such as `rejects_negative_amount`, s...
Q3. Write unit tests for a pricing function.
Given a pricing function, write focused tests with JUnit and AssertJ. ```java class PriceCalculator { BigDecimal finalPrice(BigDecimal base, int qty, boolean member) { if...
Q4. When do you use a t-test versus a z-test?
Both test hypotheses about means, and the choice hinges on whether the population standard deviation is known and the sample size. Use a z-test when the population standa...
Q5. How would you design a test strategy for a microservices system?
Testing a distributed system needs a layered strategy, because full end-to-end coverage does not scale. - Unit tests per service for domain logic, run on every commit. - ...