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If a problem only occurs randomly once in every N times on average, how many tests do I have to perform to be...

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0; } 40 7 I know that you can never be 100% sure, but is there a method to determine an appropriate number of tests? manual-testing intermittent-failures share | improve this question edited May 28 at 8:51 jonrsharpe 215 1 1 gold badge 3 3 silver badges 9 9 bronze badges asked May 28 at 7:03 Sam Hall Sam Hall