feat(core): add validated configuration and CLI foundation

tests/helpers.sh

@@ -2,8 +2,10 @@
 set -Eeuo pipefail
 umask 077
 
-readonly HELPERS_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
-readonly PROJECT_DIR="$(cd -- "${HELPERS_DIR}/.." && pwd)"
+HELPERS_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+readonly HELPERS_DIR
+PROJECT_DIR="$(cd -- "${HELPERS_DIR}/.." && pwd)"
+readonly PROJECT_DIR
 TEST_ROOT=''
 TEST_MOCK_LOG=''
 TEST_FAILURES=0
@@ -67,6 +69,14 @@ assert_file_exists() {
   fi
 }
 
+assert_file_absent() {
+  local path=$1 message=${2:-файл отсутствует}
+  ((TEST_ASSERTIONS += 1))
+  if [[ -e "$path" ]]; then
+    record_failure "${message}: найден [${path}]"
+  fi
+}
+
 assert_file_mode() {
   local expected=$1 path=$2 actual message
   actual=$(stat -c '%a' -- "$path")