Evaluating the software before it goes live and fixing whatever issues in the code, this is known as the testing phase. In this phase the developer evaluates the code and checks whether it runs without any issues or not. If there's any issue the developer traces the code back and fixes the errors.
There are five phases in a software development:
1. Planning and analysis
2. Designing the product
3. Coding
4. Testing
5. Maintenance
The phase which describes the situation in the question above is the fourth phase: the testing. In this phase the developer makes sure that there's no issues in the software before it hits the launching.
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