What is the difference between top-down and bottom-up testing?

  • Top-Down testing begins with the system and works its way down to the unit level. Bottom-up testing checks in the opposite direction, unit level to interface to overall system. Both have value but bottom-up testing usually aids in discovering defects earlier in the development cycle, when the cost to fix errors is lower.

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What is the difference between top-down and bottom-up testing?
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