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A story. Back in the 70s early 80s one did coding on punch cards and you were allowed only one test run per day. That meant when you finished coding you asked a senior developer to review your code (human test run) and once he/she gave the green light you went to run the real test.
Also, if you had for example one of the cards in the wrong order the code could not be tested but you lost the run and had to wait one day to run the test.
Jenkins will be my best friend!