Do not provide make_test_root unneeded argument

tests/shlib/vterm.sh

@@ -2,9 +2,7 @@
 set +x
 
 vterm_setup() {
-	local vterm_suf="$1" ; shift
-
-	make_test_root "vterm_$vterm_suf"
+	make_test_root
 
 	mkdir "$TEST_ROOT/path"
 

tests/test_in_vterm/test_tmux.sh

@@ -4,7 +4,7 @@
 
 enter_suite tmux
 
-vterm_setup tmux
+vterm_setup
 
 ln -s "$(which env)" "$TEST_ROOT/path"
 ln -s "$(which cut)" "$TEST_ROOT/path"

tests/test_in_vterm/test_vim.sh

@@ -3,9 +3,9 @@
 . tests/shlib/vterm.sh
 . tests/shlib/vim.sh
 
-enter_suite vim
+enter_suite vvim
 
-vterm_setup vim
+vterm_setup
 
 test_vim() {
 	if test "$PYTHON_IMPLEMENTATION" != CPython ; then