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Hi, my name is Vladimir Serov, and I'm a QA engineer at Mish. I'm sharing with you the testing principles that we use in our work.

<h3>1. Testing shows the presence of defects, not their absence.</h3>
<p>
  Testing can reveal errors, but it can never prove that a system is completely free of them. No
  matter how many tests pass, there may always be a case that exposes a hidden defect.
</p>

<h3>2. Exhaustive testing is impossible..</h3>
<p>
  No matter how thorough testing may be, it's impossible to account for all possible scenarios,
  which means we cannot anticipate all possible errors.
</p>

<h3>3. The absence-of-errors fallacy.</h3>
<p>
  Finding many bugs — or even reaching a point where no new bugs appear — doesn’t mean the product
  is flawless or ready for release. The truth is simple: no software is entirely free of defects.
</p>

<h3>4. Early testing saves time and money.</h3>
<p>
  Defects get more expensive to fix the later they’re found in the development cycle. Identifying
  issues early makes them faster, easier, and cheaper to resolve.
</p>

<h3>5. Defect clustering.</h3>
<p>
  In most systems, a small number of modules contain the majority of bugs. This follows the Pareto
  principle: 20% of modules can hold 80% of the defects.
</p>

<h3>6. Testing depends on context.</h3>
<p>
  The right methods, techniques, and types of testing depend on the nature of the system. For
  example, testing medical software requires stricter checks than testing a game.
</p>

<h3>7. The pesticide paradox.</h3>
<p>
  If you run the same tests over and over, their effectiveness decreases — just like pests develop
  resistance to a pesticide. To keep finding new defects, tests need to be reviewed and updated
  regularly.
</p>


7 Principles for Effective Testing

Серов Владимир

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