# Why Tests Must Run Automatically — CI/CD Fundamentals: Pipelines, Testing and Deployment

Source: https://www.skillbyai.com/en/cicd/cicd-testing-why

> Learn why tests must run automatically and block the pipeline instead of relying on manual testing.

## Humans forget, machines don't

A human tester skips steps when rushed or bored. A pipeline runs the **exact same suite**, in the same order, every single time a change is pushed — consistency you can rely on.

## A safety net

Automated tests in CI are a trapeze artist's safety net: invisible when you don't need it, but it's there on every single attempt — you never have to consciously decide to check it before a jump.

## Make it a gate, not a suggestion

Tests must **block** the pipeline on failure, not just warn. A test suite that's easy to ignore is a test suite people will eventually ignore.