What level of code coverage is considered most acceptable for effective software testing?

The optimal level of test coverage depends on the project, but it is generally considered good practice to aim for coverage in the range of 70-90% for effective testing.

• Less than 70% may indicate that important parts of the code are not tested, increasing the risk of errors.
• Coverage above 90% often requires excessive effort and may lead to testing trivial details, reducing efficiency.

It is important not only to the amount of code covered but also to the quality of tests: they should verify key logic, boundary cases, and potential errors.

Therefore, aim for a balance between sufficient coverage and reasonable time spent on writing and maintaining tests.