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Martin Atkins bfbe6a5553 exprstress: A randomized stress tester for expression evaluation ... Although we have a fair number of hand-written unit tests for different permutations of expression evaluation, when writing those we tend to favor relatively straightforward situations which only include a single operator or function at a time, and thus we can sometimes miss including test cases for less common situations that can arise when combining different features together. This new package and its associated CLI tool are intended to randomly generate various valid expressions with different combinations of expression operators and functions from the Terraform language, and then check to make sure that they evaluate successfully and produce a result of the expected type, mode, and sensitivity. Hopefully this will allow us to find problems that we wouldn't think to test. This is a similar sort of idea as fuzz testing, but at a higher level of abstraction where the input is intended to always be a valid expression and we're focused on the evaluator, rather than generating random bytes and trying to crash the HCL parser. This is a form of property-based testing, albeit applying the same set of properties to all possible expressions rather than testing unique properties of each expression type.		5 years ago
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tfexprstress	…
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