Add a Fibonacci Sequence Generator Challenge

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Create a new challenge for generating the Fibonacci sequence up to a given number of terms.

The challenge should include:

A Python module (fibonacci.py) with a function generate_fibonacci(n) that returns a list of the first n terms of the Fibonacci sequence.
A test module (test_fibonacci.py) with unit tests to verify the functionality, covering edge cases like n=0, n=1, and invalid inputs.

The implementation should include proper docstrings, examples, and assertions for input validation.