name: "Builtins: readonly"
cases:
  - name: "making var readonly"
    stdin: |
      my_var="value"
      readonly my_var

      echo "Invoking declare -p..."
      declare -p my_var

  - name: "using readonly with value"
    stdin: |
      readonly my_var="my_value"

      echo "Invoking declare -p..."
      declare -p my_var

  - name: "readonly array after append"
    stdin: |
      ARR=()
      f() {
          ARR+=("a" "b")
          readonly ARR
          echo "${#ARR[@]}"
      }
      f

  - name: "readonly on nameref makes nameref readonly"
    known_failure: true
    ignore_stderr: true
    stdin: |
      target="value"
      declare -n ref=target
      readonly ref
      declare -p ref
      declare -p target
      # Changing what ref points to should fail
      declare -n ref=other 2>/dev/null
      echo "exit: $?"
      # But target should still be writable
      target="new_value"
      echo "target: $target"

  - name: "readonly target through nameref assignment"
    known_failure: true
    ignore_stderr: true
    stdin: |
      target="value"
      readonly target
      declare -n ref=target
      ref="new_value" 2>/dev/null
      echo "exit: $?"
      echo "target: $target"