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Testing plays a crucial role in software development, particularly in reducing the cost and effort required to fix bugs. Research suggests that identifying issues early on can save time and money compared to addressing them later in the production phase. Studies have shown that finding and fixing bugs in earlier stages of the Software Development Life Cycle (SDLC) can be up to 100 times more efficient than doing so in production. To mitigate this, testing can be integrated at various levels, including manual testing and automation. This approach helps prevent human errors and ensures the quality of software releases.

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Source: https://dev.to/techelopment/the-importance-of-testing-and-the-impact-of-a-bug-in-production-5cb3