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Software Testing 101: Regression Tests, Unit Tests, Integration Tests, Oh My! Cleuton Sampaio Founder: "obomprogramador.com" Segregation and Test Automation have been developed and employed over the past few decades. Without automated testing, we will never be sure about the test level of the software, that is, what percentage of lines of code were actually tested. The lack of regression tests is one of the causes of "ritleness", which is the growing weakness of software over the years.