diff --git a/test/associative.test.bash b/test/associative.test.bash
index 1a550c4..ffd284b 100755
--- a/test/associative.test.bash
+++ b/test/associative.test.bash
@@ -21,13 +21,14 @@ function array_inspect {
 }
 
 function nested_new {
+  local internal
   ref_name="$1"
   shift
   [[ -v nested_count ]] && ((nested_count++)) || nested_count=1
   nested_name="nested_$nested_count"
   declare -gA "$nested_name"
   declare -gn "$ref_name"="$nested_name"
-  local -n internal="$nested_name"
+  declare -n internal="$nested_name"
   internal['TYPE']='NESTED_ARRAY'
   local i=0
   local j=0
@@ -38,7 +39,8 @@ function nested_new {
 }
 
 function nested_inspect {
-  local -n internal=$1
+  local internal
+  declare -n internal=$1
   [[ "${internal['TYPE']}" != 'NESTED_ARRAY' ]] && >&2 echo "expected nested array: $1" && return 1
 
   count=${#internal[@]}
@@ -49,12 +51,23 @@ function nested_inspect {
     array_inspect "${internal[$i]}" "  =>  "
   done
   echo ----
-  # ${!internal[@]}; do echo "${key}, ${internal[${key}]}"; done
 }
 
+# initialization
 array_new mine1 'Albert' 20
 array_new mine2 'Bob' 24
 array_new mine3 'Cobra' 31 true
 
+# change values
+mine1+=(false)
+: "$mine3" # pseudo use fix shellcheck issue
+mine3[2]=false
+
 nested_new nested1 mine1 mine2 mine3
 nested_inspect nested1
+
+# change nested values
+declare -n first="${nested1[0]:?}" # ':?' fix shellcheck issue
+first+=("nope")
+first[1]=$((first[1] + 5))
+nested_inspect nested1
diff --git a/test/increment.test.bash b/test/increment.test.bash
new file mode 100755
index 0000000..f1cdb45
--- /dev/null
+++ b/test/increment.test.bash
@@ -0,0 +1,19 @@
+#!/usr/bin/env miaou-bash
+
+function f1 {
+  if [[ -v nested_count ]]; then
+    >/dev/tty echo already defined $nested_count
+    ((nested_count++))
+  else
+    >/dev/tty echo brand new
+    nested_count=1
+  fi
+  echo $nested_count
+}
+
+echo "v=$(f1)"
+echo "v=$(f1)"
+echo "v=$(f1)"
+f1
+f1
+echo $nested_count