diff --git a/check-file-size/test.sh b/check-file-size/test.sh
new file mode 100755
index 00000000..a09b6f42
--- /dev/null
+++ b/check-file-size/test.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+prog=$(basename "$0")
+cd "$(dirname "$0")" || exit
+PATH=$(pwd):$PATH
+plugin=$(basename "$(pwd)")
+if ! which "$plugin" >/dev/null
+then
+	echo "$prog: $plugin is not installed" >&2
+	exit 2
+fi
+
+FILENAME=$(mktemp)
+dd if=/dev/zero of=$FILENAME count=1023 bs=1
+exec $plugin -b $FILENAME