Add switch -s|--stdengine

CHANGELOG.md

@@ -7,6 +7,9 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+### Added
+- Switch `-s|--stdengine` to run a set of tests only with the standard engine
+  even where this varies between configs (issue \#343)
 ## [2024-01-09]
 
 ### Fixed

l3build-arguments.lua

@@ -150,6 +150,12 @@ option_list =
         desc  = "Shuffles order of tests",
         type  = "boolean"
       },
+    stdengine =
+      {
+        desc  = "Run tests only with the standard engine",
+        short = "s",
+        type  = "boolean"
+      },
     texmfhome =
       {
         desc = "Location of user texmf tree",

l3build-check.lua

@@ -595,7 +595,9 @@ function runcheck(name, hide)
     return 1
   end
   local checkengines = checkengines
-  if options["engine"] then
+  if options["stdengine"] then
+    checkengines = {stdengine}
+  elseif options["engine"] then
     checkengines = options["engine"]
   end
   local failedengines = {}

l3build.1

@@ -77,6 +77,8 @@ Shows the full log of the failure with 'halt-on-error'
 Shows the invocation to update failing .tlg files
 .IP --shuffle
 Shuffles order of tests
+.IP --stdengine|-s
+Run tests only with the standard engine
 .IP --texmfhome
 Location of user texmf tree
 .IP --version