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A design remedy that prevents bugs is always preferable to a test method that discovers them.

Boris Beizer

First law: The pesticide paradox. Every method you use to prevent or find bugs leaves a residue of subtler bugs against which those methods are ineffective.
BORIS BEIZER

Law Pesticides Use
A design remedy that prevents bugs is always preferable to a test method that discovers them.
BORIS BEIZER

Bugs Design Tests
Bugs lurk in corners and congregate at boundaries.
BORIS BEIZER

Boundaries Bugs Programming
A good threat is worth a thousand tests.
BORIS BEIZER

Bugs Programming Tests
In programming, it’s often the buts in the specification that kill you.
BORIS BEIZER

Programming Specification
If you can’t test it, don’t build it. If you don’t test it, rip it out.
BORIS BEIZER

Bugs Rip Tests
Software never was perfect and won’t get perfect. But is that a license to create garbage? The missing ingredient is our reluctance to quantify quality.
BORIS BEIZER

Missing Perfect Quality
More than the act of testing, the act of designing tests is one of the best bug preventers known.
BORIS BEIZER

Bugs Design Tests
Extra features were once considered desirable. We now recognize that ‘free’ features are rarely free. Any increase in generality that does not contribute to reliability, modularity, maintainability, and robustness should be suspected.
BORIS BEIZER

Doe Increase Reliability
If the objective of testing were to prove that a program is free of bugs, then not only would testing be practically impossible, but it would also be theoretically impossible.
BORIS BEIZER

Bugs Impossible Program

A design remedy that prevents bugs is always preferable to a test method that discovers them.

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A design remedy that prevents bugs is always preferable to a test method that discovers them.

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