The following are some facts pertaining to the cost incurred in testing tools.

Automated Script Development

Automated test tools do not create test scripts. Therefore, a significant time is needed to program the tests. Scripts are themselves programming languages. Thus, automating test execution requires programming exercises.

Training Required

It is not necessary that the tester will be aware of all the tools and can use them directly. He/She may require training regarding the tool, otherwise it ends up on the shelf or implemented inefficiently. Therefore, it becomes necessary that in a new project, cost of training on the tools also be included in the project budget and schedule.

Configuration Management

Configuration management is necessary to track a large number of files and test related artifacts.

Learning Curve for Tools

There is a learning curve in using any new tool. For example, test scripts generated by the tool during recording must be modified manually, requiring tool-scripting knowledge in order to make the script robust, reusable, and maintainable.

Testing Tools Can Be Intrusive,

It may be necessary that for automation some tools require that a special code is inserted in the system to work correctly and to be integrated with the testing tools. These tools are known as intrusive tools which require addition of a piece of code in the existing software system. Intrusive tools pose the risk that defects introduced by the code inserted specifically to facilitate testing could interfere with the normal functioning of the system.

Multiple Tools Required

It may be possible that your requirement is not satisfied with just one tool for automation. In such a case, you have to go for many tools which incur a lot of cost.