Test Automation
Test automation uses software tools and scripts to execute tests, compare actual and expected results, and report outcomes — replacing or supplementing manual, human-driven test execution. It trades upfront setup cost for speed, consistency, and the ability to re-run the same checks constantly at near-zero marginal cost.
Not everything should be automated — exploratory testing and usability testing rely on human judgment automation can't replicate — but anything that's repeated often, well-defined, and stable is a strong automation candidate: regression suites, smoke tests, and API contract checks are classic examples where automation pays for itself quickly.
The test automation pyramid is the standard framework for deciding where to invest: heavy automated coverage at the fast, cheap unit level, less at the slower integration level, and the least at the slowest, most brittle end-to-end level — with manual and exploratory testing reserved for what automation genuinely can't do well.
