
Extract the answer to the question from the following context.
Question: Which of the following is not a black-box testing method: fuzz testing, model-based testing, use case testing, or internal implementation?
Context: Black-box testing treats the software as a "black box", examining functionality without any knowledge of internal implementation, without seeing the source code. The testers are only aware of what the software is supposed to do, not how it does it. Black-box testing methods include: equivalence partitioning, boundary value analysis, all-pairs testing, state transition tables, decision table testing, fuzz testing, model-based testing, use case testing, exploratory testing and specification-based testing.

internal implementation
