Sanity Test
In plain terms
A quick check that a specific function works after a change.
Going deeper
A sanity test narrowly verifies that a particular fix or feature behaves correctly, a focused, shallow check. It confirms reasonableness before deeper testing.
Under the hood
Narrower than smoke testing; confirms a specific change didn't obviously break.
Examples
Post-fix verification, focused checks, quick validation, change confirmation.
Think of it like...
Like quickly confirming a repaired faucet runs water before testing the whole plumbing.