During white-box testing, code is run with preselected input values for the validation of preselected output values. White-box testing often involves writing software code stubs and drivers.

White-box testing advantages include:

• Enables test case reusability and delivers greater stability
• Facilitates code optimization
• Facilitates finding of the locations of hidden errors in early phases of development
• Facilitates effective application testing
• Removes unnecessary lines of code

Disadvantages include:

• Requires a skilled tester with internal structure knowledge
• Time consuming
• High costs
• Code bit validation is difficult.

White-box testing complements unit testing, integration testing and regression testing