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Hi! The problem is that the test environment inherits from the global environment. See https://github.com/hadley/testthat/blob/master/R/test-files.r The students labs are simply an R script file. Say that they have an assignment to calculate sqrt(2) and store it in variable a. In the same session they should be able to test the script file when they are done (using a function mark_my_file() in