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Three Conditions Of A Bug’s Existence

Lecture 1 - A Bug or Not a Bug -> Quick Intro -> Three Conditions Of A Bug’s Existence -> The Gist Of Testing

A bug exists only if ALL of the following three conditions are met: 

            1. We know the expected result

            2. We know the actual result

            3. We know that the actual result deviates from the expected result

BTW

My advice: Every time you see a mismatch between the actual and expected, label that situation with the word “bug.” As time goes on, you’ll develop a habit, which will gradually grow into a reflex. Please note that for the sake of this training, it doesn’t matter how futile, cheap, or temporary your expectations are – the main thing here is to gain the skill of automatic bug recognition.

Example

 Here are some more bugs from real life:

            1. A nice face backed up by ugly personality.

            2. Parrots say the nastiest words at absolutely inappropriate times.

            3. Hollywood story: reach fame and drink yourself to grave. Next ->

Lecture 1 - A Bug or Not a Bug >- Quick Intro -> Three Conditions Of A Bug’s Existence -> The Gist Of Testing