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Which two concepts describe test-driven development? (Choose two.)
Correct Answer: A,B
https://www.agilealliance.org/glossary/tdd/ It can be succinctly described by the following set of rules: -write a "single" unit test describing an aspect of the program -run the test, which should fail because the program lacks that feature -write "just enough" code, the simplest possible, to make the test pass -"refactor" the code until it conforms to the simplicity criteria -repeat, "accumulating" unit tests over time