How does the quality of written code affect the testing processes of software products?

The quality of written code directly affects testing processes:

• Readability and maintainability: clean and structured code is easier to test because testers and developers understand the logic faster.
• Modularity: well-separated code allows writing unit tests for individual components without complex dependencies.
• Predictability: code with clear logic reduces the number of unexpected errors and simplifies the creation of test scenarios.
• Automation: quality code is usually accompanied by tests, which facilitates automated testing and integration.

For example, if functions have clearly defined inputs and outputs without side effects, they are easy to cover with unit tests, which speeds up the detection and correction of errors.