add warning if no modules are found by find_modules

eessi/testsuite/common_config.py

@@ -172,11 +172,12 @@ def common_eessi_init(eessi_version=None):
     Deprecated - print warning with suggested change.
     """
     getlogger().warning(' '.join([
-        'common_eessi_init() is deprecated, you should replace the prepare_cmds in your ReFrame configuration.'
-        ' On systems that have a module command available, you should no longer need any prepare_cmds.'
-        " On systems that don't have a module command available, you need something like"
-        " 'prepare_cmds' : ['source /cvfms/software.eessi.io/2025.06/init/lmod/bash && module unload EESSI']"
-        " in order to use the Lmod from the EESSI compatibility layer (but not yet have an EESSI version loaded)"
+        "common_eessi_init() is deprecated, you should update the 'prepare_cmds' in your ReFrame configuration.\n"
+        "On systems that have a `module` command available, you no longer need to add any EESSI-specific commands to "
+        "'prepare_cmds', unless jobs start in a clean environment (e.g. with sbatch --export=NONE), where you set:\n"
+        "'prepare_cmds': ['export MODULEPATH=/cvmfs/software.eessi.io/init/modules'].\n"
+        "If no `module` command is available, source Lmod from the compatibility layer using:\n"
+        "'prepare_cmds' : ['source /cvfms/software.eessi.io/2025.06/init/lmod/bash && module unload EESSI']"
     ]))
     return 'source /cvfms/software.eessi.io/2025.06/init/lmod/bash && module unload EESSI'
 

eessi/testsuite/utils.py

@@ -182,6 +182,10 @@ def _is_valid_for_env(mod, env):
                 snap0.restore()
             seen = set()
             dupes = []
+
+            if len(_modules_cache[part.fullname][env.name]) == 0:
+                getlogger().warning(f"No '{regex}' modules found in partition '{part.fullname}' environment '{env}'")
+
             for mod in _modules_cache[part.fullname][env.name]:
                 modmod = mod
                 if name_only: