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27+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes jest basics, junit5 basics, mockito basics, spring boot test slices, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Every professional development team writes tests, and freshers who can write a basic JUnit test for a service class and mock its dependencies with Mockito are noticeably ahead. This module covers the test pyramid (unit → integration → end-to-end) and why mocking makes sense at the unit level, JUnit 5 annotations (@Test, @BeforeEach, @AfterEach, @ParameterizedTest), Mockito's when/thenReturn and verify patterns, Spring Boot's @WebMvcTest and @DataJpaTest slices for integration testing, and a brief introduction to Jest and React Testing Library for the frontend side. You don't need to be a testing expert — you need to show you value it.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–27 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–27 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q27.