Senior
What is your attitude towards the statement that 100% test coverage is impossible and not always necessary?
sobes.tech AI
Answer from AI
The statement that 100% test coverage is impossible and not always necessary is quite justified.
Firstly, achieving 100% code coverage is difficult due to:
- complex branching and exceptional cases,
- code that is hard or impossible to test (e.g., exception generation in system code),
- dynamic behavior and external dependencies.
Secondly, 100% coverage does not guarantee the absence of bugs — tests can be superficial and not verify the logic.
Thirdly, striving for 100% coverage can lead to redundant tests, increased maintenance complexity, and slower development.
It is optimal to aim for a reasonable coverage that ensures testing of critical and complex parts of the code, as well as coverage of main usage scenarios.