What is Build Verification or Build Validation Test?
    In software testing, a Build Verification Test (BVT), also known as
    Build Acceptance Test, is a set of tests run on each new build of a product
    to verify that the build is testable before the build is released into the
    hands of the test team.

Scope of Testing:
    The build acceptance test is generally a short set of tests,
    which exercises the mainstream functionality of the application software.
    Any build that fails the build verification test is rejected,
    and testing continues on the previous build (provided there has been at
    least one build that has passed the acceptance test)

Source of definition: https://en.wikipedia.org/wiki/Build_verification_test

Gluster BVT: BVT is divided in 2 set of tests.
    - BVT-Basic :
        BVT-Basic is the first set of tests to qualify the build.
        Tests include validating services (glusterd, smb etc),
        validating volume operations (create, start, stop , status)

    - BVT-VVT ( VVT: Volume verification test)
        BVT-VVT is the second set of tests to qualify whether the build is good to
        be consumed for further testing once BVT-Basic passes.
        BVT-VVT covers the following gluster specific test on all combinations
        of volume and mount types supported by gluster.

        Test Case Summary:
            1) Creates a volume
            2) Mounts the volume
            3) Run IO from the mount.
            4) teardown the mount
            5) teardown the volume

        Volume types:
            - Distribute
            - Replicate
            - Distribute-Replicate
            - Disperse
            - Distribute-Disperse

        Mount types:
            - Glusterfs
            - Nfs
            - CIFS