Restrict tmux and desktop tools to Void hosts

dotfiles/desktop/.tmux/plugins/tpm/tests/helpers/tpm.sh

@@ -0,0 +1,13 @@
+check_dir_exists_helper() {
+	[ -d "$1" ]
+}
+
+# runs the scripts and asserts it has the correct output and exit code
+script_run_helper() {
+	local script="$1"
+	local expected_output="$2"
+	local expected_exit_code="${3:-0}"
+	$script 2>&1 |
+		grep "$expected_output" >/dev/null 2>&1 && # grep -q flag quits the script early
+		[ "${PIPESTATUS[0]}" -eq "$expected_exit_code" ]
+}