Make sure load/unload really does empty the environment

Author: ocaisa

.github/workflows/tests_eessi_module.yml

@@ -113,6 +113,13 @@ jobs:
           env | grep -E '(^EESSI_|^LMOD_RC|^LMOD_PACKAGE_PATH)' | sort > "${moduleoutfile}"
           module unload EESSI/${{matrix.EESSI_VERSION}}
           
+          # We should only have two EESSI_* variables defined (which set the overrides)
+          if [ "$(env | grep -c '^EESSI')" -ne 2 ]; then
+          echo "Expected 2 EESSI-related environment variables, but found a different number."
+          env | grep '^EESSI'
+          exit 1
+          fi
+
           # Now do the init script initialisation
           source ./init/bash
           # source script version sets environment variables to force archdetect, ignore these