Provide a graphical model of the Test-Driven Development (TDD) process as it would be employed in support of agile methods such as Extreme Programming. Your model should incorporate only the following process activities: (listed in no particular order)

A: Run the test together with other tests that have already been implemented. (Show two possible outcomes of this activity in your model: pass and fail)

B: Implement the new functionality and refactor.

C: Write and implement a test for the new functionality.

D: Identify the new functionality.

Use ovals (labeled A, B, C, or D to represent the four activities identified above), arrows, diamonds, etc., to model the TDD process as discussed in class. (An illustrative example of a process model is shown below.)

Example process model:

NO YES N Quality OK? NO YES N Quality OK