A young new dev was working on his first ticket, about a bug during parsing of an uploaded excel file. Our issue was that if the file contained an empty line, all remaining rows were ignored. So the task included extending our tests to cover this case. After 2 weeks (!), his merge request comes in. His idea (without ever asking for help) was to parse the whole file (in some cases huge) in the production code a second time, just to count the rows (!!) and save the count in a public static int field, which was verified in his new test.