Exploration of https://github.com/bats-core/.

overview.bats

# This function will be called before each test case.
setup () {
    # This block will run only for the first test in this file.
    # Usefull for setting up resources that should last for all tests.
    if [[ "$BATS_TEST_NUMBER" -eq 1 ]]; then
	:
    fi
    :
}


# This function will be called after each test case.
teardown () {
    # This block will run only for the last test case in this file.
    # Usefull for tearing down global resources.
    if [[ "${#BATS_TEST_NAMES[@]}" -eq "$BATS_TEST_NUMBER" ]]; then
	:
    fi
    :
}


@test "hello, world" {
    run echo "Hello, bats!"
    [ "$status" -eq 0 ]
    [ "$output" = "Hello, bats!" ]
}

@test "can handle failing commands" {
    run rm inexistent_file  # should return 1
    [ "$status" -eq 1 ]

    run grep "." inexistent_file  # should return 2
    [ "$status" -eq 2 ]
}

Run with

$ bats overview.bats

Expected output:

 ✓ hello, world
 ✓ can handle failing commands

2 tests, 0 failures