Testing help us to measure the quality of software in terms of the number of defects found, the tests run, and the system covered by the tests. Testing can give confidence in the quality of the software.
Of course, a poor test may uncover few defects and leave us with a false sense of security. A well-designed test will uncover defects if they are present and so, if such a test passes, we will rightly be more confident in the software and be able to assert that the overall level of risk of using the system has been reduced and we can gain confidence on the quality of the software.
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