From 4d8e5d94341e9d593ddb409805fb7643c91074fd Mon Sep 17 00:00:00 2001
From: Joseph Wright <joseph.wright@morningstar2.co.uk>
Date: Tue, 12 Dec 2023 18:37:29 +0000
Subject: [PATCH] Suppress runtest_tasks() if empty

This avoids an unrequired shell call.
---
 l3build-check.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/l3build-check.lua b/l3build-check.lua
index e846e8a..3718d17 100644
--- a/l3build-check.lua
+++ b/l3build-check.lua
@@ -824,7 +824,7 @@ function runtest(name, engine, hide, ext, test_type, breakout)
     )
     -- On Windows, concatenating here will suppress any non-zero errorlevel
     -- from the main run, so we split into two parts.
-    if errlevels[i] == 0 then
+    if errlevels[i] == 0 and runtest_tasks("X",0) ~= "" then
       local errorlevel =
         runcmd(preamble .. runtest_tasks(jobname(lvtfile),i),testdir)
       if errorlevel ~= 0 then errlevels[i] = errorlevel end