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Learning book "Practical Unit Testing with JUnit and Mockito" written by Tomek

SUT: System under Test
DOC: depended on component

Phases of a Unit Test:
arrange, act, assert


TDD Rhythm
#1 Write a test that fails(Red)
#2 Make the code work( Green)
#3 Eliminate redundancy(Refactor)
rule: Never write code without a failing test!



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