Interview Questions

2012/11/14

Explain Java Garbage collection.?

What makes a good unit test?

  • Automatic : Invoking of tests as well as checking results for PASS/FAIL should be automatic
  • Thorough: Coverage; Although bugs tend to cluster around certain regions in the code, ensure that you test all key paths and scenarios.. Use tools if you must to know untested regions
  • Repeatable: Tests should produce the same results each time.. every time. Tests should not rely on uncontrollable params.
  • Independent: Very important.
    • Tests should test only one thing at a time. Multiple assertions are okay as long as they are all testing one feature/behavior. When a test fails, it should pinpoint the location of the problem.
    • Tests should not rely on each other – Isolated. No assumptions about order of test execution. Ensure ‘clean slate’ before each test by using setup/teardown appropriately
  • Professional: In the long run you’ll have as much test code as production (if not more), therefore follow the same standard of good-design for your test code. Well factored methods-classes with intention-revealing names, No duplication, tests with good names, etc.

What is a Database Deadlock?

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