Both smoke and sanity tests are fast sanity checks, but they serve distinct purposes in a CI/CD pipeline. Understanding when and how to use each prevents wasted effort, catches broken builds early, and keeps the feedback loop tight for developers.
Smoke Testing
Smoke testing asks “Is the build even testable?” It is a broad, shallow pass over the core functionality of the application. The suite runs first, on every new build, and its goal is to fail fast if the build is fundamentally broken—missing dependencies, failing to launch, or crashing on start‑up. Because it touches many areas briefly, smoke tests are ideal candidates for automation and are often gated in the CI pipeline. If the smoke suite fails, the build is rejected before any deeper testing proceeds.
Sanity Testing
Sanity testing asks “Did this specific fix work?” It is a narrow, focused check on a recent change or hot‑fix. The suite runs after the targeted fix is deployed and verifies that the corrected behavior behaves as expected, without exercising the entire application. Sanity tests are not a full regression pass; they concentrate on one area and go deeper than a smoke check. Because the context is often a quick human judgment about a specific defect, sanity testing is frequently performed manually.
Scope Comparison
The primary difference lies in breadth versus depth.
- Smoke: wide and shallow – it touches many modules briefly to ensure the build is stable enough for further testing.
- Sanity: narrow and deep – it drills into a single module or feature to confirm that a recent change works correctly.
Who Usually Runs Them
- Smoke: typically automated and executed by the CI system as a build gate. No human intervention is required unless the suite fails.
- Sanity: often manual, performed by a tester or developer who knows the specifics of the recent change. The human element allows quick verification of edge cases that automation may miss.
Do / Avoid
Do
- Automate smoke tests as a CI gate to block broken builds early.
- Run sanity checks right after every hot‑fix deploy to confirm the fix before wider testing.
- Keep both suites short by design; they are meant to be quick feedback mechanisms, not exhaustive regressions.
Avoid
- Don’t confuse a sanity check with a full regression pass; it should remain focused on the changed area.
- Don’t skip smoke testing on “small” builds; even minor changes can break core startup paths.
- Don’t let smoke tests grow into a full regression suite over time; maintain their shallow nature to preserve speed.
A well‑balanced combination of automated smoke gates and targeted sanity checks keeps the pipeline fast, reliable, and focused on delivering quality continuously.
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