Use date based versioning with format of "yymmdd$tried", and restrict the build number in 8 characters

app_versioning_test.bats

#!/usr/bin/env bats

date_based_version=$(date +%y%m%d)

# $args1 equals to LATEST_BUILD_NUMBER
# $args2 equals to DATE_BASED_BUILD_NUMBER
get_build_number() {
	latest_build_number=$1
	build_number_len="${#latest_build_number}"
	if [[ $build_number_len -gt 8 ]]; then
		updated_build_number=$2
	else
		if [[ $2 -gt $1 ]]; then
			updated_build_number=$2
		else
			updated_build_number=$(($1 + 1))
		fi
	fi

	echo $((updated_build_number))
}

@test "Date based version returned" {
	local latest_build_number=2023030201
	local updated_build_number=$(get_build_number $latest_build_number $date_based_version)

	[ $updated_build_number -eq $date_based_version ]
}

@test "Latest version + 1 returned" {
	local latest_build_number=23030402
	local updated_build_number=$(get_build_number $latest_build_number $date_based_version)

	[ $updated_build_number -eq $(($latest_build_number + 1)) ]
}