Explain why it is not necessary for a program to be completely free of defects before it is delivered to its customers. Explain why testing can only detect the presence of errors, not their absence. What are the benefits of involving users in release testing at an early stage in the testing process? Are there disadvantages in user involvement? What is regression testing? Explain how the use of automated tests and a testing framework such as JUnit simplifies regression testing.

Explanation: Testing is a set of activities that aim to detect software anomalies in a way that the errors can be discovered and correctes. The goal of software testing is to observe if the software behavior meet the requirements that they are expected to meet. Testing demonstrates to the developer that the software fullfils its requirements and it is a way to find out if it behaves in a incorrect, undesirable ou different form from the specifications.

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