Bats Testing Patterns

Bats (bats-core) runs .bats files as TAP-compliant Bash tests. Each @test block runs in its own subshell/process; state never leaks between tests. export a variable when a command run via run within the same test needs to see it.

Test File Anatomy

#!/usr/bin/env bats
setup() {                      # before EACH test
    export SCRIPT="${BATS_TEST_DIRNAME}/../bin/script.sh"
}
setup_file() {                 # once, before the file's first test
    export FIXTURE_DB="$BATS_FILE_TMPDIR/seed.db"
}