What is the difference between Smoke & Sanity Testing? ~ Testing Answers

Smoke Testing: Software Testing done to ensure that whether the build can be accepted for through software testing or not. Basically, it is done to check the stability of the build received for software testing.

Sanity testing: After receiving a build with minor changes in the code or functionality, a subset of regression test cases are executed that to check whether it rectified the software bugs or issues and no other software bug is introduced by the changes. Sometimes, when multiple cycles of regression testing are executed, sanity testing of the software can be done at later cycles after through regression test cycles. If we are moving a build from staging / testing server to production server, sanity testing of the software application can be done to check that whether the build is sane enough to move to further at production server or not.

Difference between Smoke & Sanity Software Testing:

Smoke testing is a wide approach where all areas of the software application are tested without getting into too deep. However, a sanity software testing is a narrow regression testing with a focus on one or a small set of areas of functionality of the software application.
The test cases for smoke testing of the software can be either manual or automated. However, a sanity test is generally without test scripts or test cases.
Smoke testing is done to ensure whether the main functions of the software application are working or not. During smoke testing of the software, we do not go into finer details. However, sanity testing is a cursory software testing type. It is done whenever a quick round of software testing can prove that the software application is functioning according to business / functional requirements.
Smoke testing of the software application is done to check whether the build can be accepted for through software testing. Sanity testing of the software is to ensure whether the requirements are met or not.

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Smoke Test:

When a build is received, a smoke test is run to ascertain if the build is stable and it can be considered for further testing.

Smoke testing can be done for testing the stability of any interim build.

Smoke testing can be executed for platform qualification tests.

Sanity testing:

Once a new build is obtained with minor revisions, instead of doing a through regression, a sanity is performed so as to ascertain the build has indeed rectified the issues and no further issue has been introduced by the fixes. Its generally a subset of regression testing and a group of test cases are executed that are related with the changes made to the app.

Generally, when multiple cycles of testing are executed, sanity testing may be done during the later cycles after through regression cycles.

	*Smoke*	*Sanity*
1	Smoke testing originated in the hardware testing practice of turning on a new piece of hardware for the first time and considering it a success if it does not catch fire and smoke. In software industry, smoke testing is a shallow and wide approach whereby all areas of the application without getting into too deep, is tested.	A sanity test is a narrow regression test that focuses on one or a few areas of functionality. Sanity testing is usually narrow and deep.
2	A smoke test is scripted--either using a written set of tests or an automated test	A sanity test is usually unscripted.
3	A Smoke test is designed to touch every part of the application in a cursory way. It's is shallow and wide.	A Sanity test is used to determine a small section of the application is still working after a minor change.
4	Smoke testing will be conducted to ensure whether the most crucial functions of a program work, but not bothering with finer details. (Such as build verification).	Sanity testing is a cursory testing; it is performed whenever a cursory testing is sufficient to prove the application is functioning according to specifications. This level of testing is a subset of regression testing.
5	Smoke testing is normal health check up to a build of an application before taking it to testing in depth.	sanity testing is to verify whether requirements are met or not, checking all features breadth-first.