refactored test

test/miaou-bash.test.bash

@@ -1,6 +1,21 @@
 #!/usr/bin/env bash
-# do not use miaou-bash as the shebang
 
-./test/stub/scenario.bash success >/dev/null
-[[ $(./test/stub/scenario.bash unbound_variable 2>&1 1>/dev/null) =~ 'TYPE: UNBOUND VARIABLE' ]]
-[[ $(./test/stub/scenario.bash false 2>&1 1>/dev/null) =~ 'TYPE: FALSE' ]]
+# functions
+
+function assert {
+  ./test/stub/scenario.bash "$1" >/dev/null || (echo "error in: $1" && exit 1)
+}
+
+function fail_type {
+  stderr=$(./test/stub/scenario.bash "$1" 2>&1 >/dev/null)
+  code="$?"
+  regex="TYPE: $2"
+  [[ "$code" != 0 ]] && [[ "$stderr" =~ $regex ]] || (echo "error in: $1" && exit 1)
+}
+
+# main
+
+assert success
+fail_type subshell_term 'SUBSHELL TERM'
+fail_type unbound_variable 'UNBOUND VARIABLE'
+fail_type false 'FALSE'