Basically, software testing is an investment in your quality. No matter how good you are, you will never think of everything. This is especially true of creating software. Here are five great reasons to consider when thinking about the important investment of testing your software:
1. To ensure that what you created does what it’s supposed to do.
2. We owe it to our users and ourselves to deliver the best application we can.
3. There are lots of different devices, browsers, and operating systems out there.
4. There’s always chance that a user really will do that – no matter how silly it seems.
5. Something that works when one person is using it may not work when hundreds of people are using it. (http://blogs.askcts.com/2016/02/25/why-test- software-at- all/)
To be honest, it may never be possible to find all of the bugs in your product, but the goal is to find a high percentage of them before releasing the product. It is much better for you if testers find the bugs instead of your customers.
Testing is also a form of risk management. Security is one type of issue that needs to be tested because security breaches can cost your business both in reputation and money, and that cost can be very high depending on your product’s risk level. Independent testing has the advantage of approaching your product in ways that traditional methods and firewalls will not protect from.