diff --git a/test/miaou-bash.test.bash b/test/miaou-bash.test.bash
index 9fa7a31..0c19fcf 100755
--- a/test/miaou-bash.test.bash
+++ b/test/miaou-bash.test.bash
@@ -12,7 +12,7 @@ readonly TMP_DIRECTORY TMP_OUT TMP_ERR TMP_MIAOU
 
 function assert {
   ((test_count++))
-  cmd="./test/stub/scenario.bash $1"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $1"
   if $cmd >/dev/null 2>/dev/null 3>"$TMP_MIAOU"; then
     if [[ -s "$TMP_MIAOU" ]]; then
       echo -n .
@@ -34,7 +34,7 @@ function assert_grep {
   ((test_count++))
   local script="$1" content="$2" extra_args=()
   [[ $# -gt 3 ]] && shift 3 && extra_args=("$@")
-  cmd="./test/stub/scenario.bash $script"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $script"
   if $cmd "${extra_args[@]}" >"$TMP_OUT" 2>/dev/null 3>/dev/null; then
     if grep -q "$content" "$TMP_OUT"; then
       echo -n .
@@ -54,7 +54,7 @@ function fail_type {
   success=false
   hint_message="${3:-}"
 
-  cmd="./test/stub/scenario.bash $1"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $1"
   # mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
   $cmd >/dev/null 2>"$TMP_ERR" 3>"$TMP_MIAOU"
   mapfile -t stderr <"$TMP_ERR"
@@ -78,7 +78,7 @@ function fail_type {
 
 function fail_stderr_grep {
   ((test_count++))
-  cmd="./test/stub/scenario.bash $1"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $1"
   stderr_line="$2"
   if ! $cmd 2>"$TMP_ERR" 3>/dev/null && grep -q "$stderr_line" "$TMP_ERR"; then
     echo -n .
@@ -94,8 +94,7 @@ function fail_stderr_count {
   ((test_count++))
   local regex count="$2"
 
-  cmd="./test/stub/scenario.bash $1"
-  # mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $1"
   if ! $cmd >/dev/null 2>"$TMP_ERR" 3>/dev/null; then
     mapfile -t stderr <"$TMP_ERR"
     if [[ "${#stderr[@]}" == "$count" ]]; then
@@ -113,7 +112,7 @@ function fail_miaou_count {
   ((test_count++))
   local regex count="$2"
 
-  cmd="./test/stub/scenario.bash $1"
+  cmd="$MIAOU_BASH_DIR/test/stub/scenario.bash $1"
   # mapfile -t stderr <<<"$(miaou-bash ./test/stub/scenario.bash "$1" 2>&1 >/dev/null 3>/dev/null)"
   if ! $cmd >/dev/null 2>/dev/null 3>"$TMP_MIAOU"; then
     mapfile -t miaou <"$TMP_MIAOU"
@@ -131,6 +130,8 @@ function fail_miaou_count {
 
 set -uo pipefail
 
+[[ ! -v MIAOU_BASH_DIR ]] && >&2 echo MIAOU_BASH_DIR missing && builtin exit 1
+
 test_count=0
 failures=()
 mkdir -p "$TMP_DIRECTORY"
diff --git a/test/stub/extra/library.bash b/test/stub/extra/library.bash
index 0a33269..78b9290 100755
--- a/test/stub/extra/library.bash
+++ b/test/stub/extra/library.bash
@@ -7,7 +7,7 @@ function library {
   echo library loaded
   >&2 echo stderr from library
   # . "./test/stub/extra/onemore.bash"
-  "./test/stub/extra/onemore.bash"
+  "$MIAOU_BASH_DIR/test/stub/extra/onemore.bash"
 }
 
 library