Black-box testing:
It is not based on knowledge of internal design or code. Tests are based on requirements and functionality. Black box testing is used to find the errors in the following.

• Interface errors.
• Performance errors.
• Initialization errors.
• Incorrect or missing functionality.
• Errors while accessing external database.

Glass-box testing:
It is based on internal design of an application code. Tests are based on path coverage, branch coverage, and statement coverage. It is also known as White Box testing.

• White box test cases can check for.
• All independent paths with in a module are executed atleast once.
• Execute all loops.
• Exercises all logical decisions.
• Exercise internal data structure to ensure their validity.