diff --git a/tests/modalias.prov.collect b/tests/modalias.prov.collect
new file mode 100755
index 0000000..deaeaf7
--- /dev/null
+++ b/tests/modalias.prov.collect
@@ -0,0 +1,31 @@
+#! /bin/bash -efu
+
+# This fetches test data from current system's /lib/modules
+# to /tmp/COLLECT
+
+IFS=$'\n'
+
+find /lib/modules | grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$' \
+| while IFS='' read -r module; do
+    modver=$(/sbin/modinfo -F version "$module")
+    # delete possible extra lines because some modules have *two* version tags. *cough*b44*cough*
+    modver=${modver%%$'\n'*}    # using $'' bashism, avoid running "head -n1" process
+    # replace any strange chars with underscores.
+    # [!...] is glob's "match any char not in set" pattern
+    # (although bash supports [^...] too, it is not standard)
+    modver=${modver//[!0-9a-zA-Z._]/_}
+    # only add version tag if it has a version
+    [ -z "$modver" ] || modver=" = $modver"
+
+    d="/tmp/COLLECT$module"
+    d="${d%/*}"
+    mkdir -p "$d"
+
+    out=`/sbin/modinfo -F alias "$module" \
+    | sed -E "s,[^][0-9a-zA-Z._:*?/-],_,g; s,(.+),modalias(\\1)$modver,"`
+
+    [ "$out" ] || continue
+
+    echo "/tmp/COLLECT$module.modalias$modver" >&2
+    printf '%s\n' "$out" >"/tmp/COLLECT$module.modalias"
+done
diff --git a/tests/modalias.prov.runtest b/tests/modalias.prov.runtest
new file mode 100755
index 0000000..2fbc655
--- /dev/null
+++ b/tests/modalias.prov.runtest
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+function die()
+{
+    printf '%s\n' "$*" >&2
+    exit 1
+}
+
+set -e
+
+cd modalias.prov.testdata
+test -x ../../modalias.prov || die "No ../../modalias.prov"
+
+# Copy and add -t option to modalias.prov
+cp ../../modalias.prov modalias.prov
+patch -p1 <<"EOF"
+--- a/modalias.prov
++++ b/modalias.prov
+@@ -86,6 +86,17 @@ combine_modaliases() {
+     print_modaliases "$class" "$variants" "$pos"
+ }
+ 
++if [ "$#" = 2 ] && [ "$1" = "-t" ]; then
++    cat -- "$2" \
++    | { while read line; do echo "${#line} $line"; done } \
++    | LC_ALL=C sort -u \
++    | combine_modaliases \
++    >"$2.test"
++    echo "Comparing results for $2"
++    diff -u "$2.right" "$2.test" && rm -- "$2.test"
++    exit
++fi
++
+ for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do
+     # | head -n1 because some modules have *two* version tags. *cough*b44*cough*
+     modver=$(/sbin/modinfo -F version "$module"| head -n1)
+EOF
+
+find | grep '\.ko.*\.modalias$' | xargs -n1 ./modalias.prov -t
+
+# Rename newly generated .test as .right
+#find | grep '\.ko.*\.modalias$' | xargs -I'{}' mv '{}'.test '{}'.right
diff --git a/tests/modalias.prov.testdata.tar.xz b/tests/modalias.prov.testdata.tar.xz
new file mode 100644
index 0000000..790d08e
Binary files /dev/null and b/tests/modalias.prov.testdata.tar.xz differ