add test, escape spaces in output

test/01.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+dir=$(dirname "$(readlink -f "$0")")
+trie="$dir/../trie.py"
+
+read -r -d '' input <<EOF
+a b x
+a b c
+a b c d
+EOF
+
+output=$(echo "$input" | "$trie")
+
+# shellcheck disable=SC2086
+result=$(eval 'for i in '$output' ; do echo "$i" ; done' | sort)
+
+reference=$(echo "$input" | sort | uniq)
+
+if test "$reference" = "$result" ; then
+    rv=0
+else
+    printf 'ERROR: reference=\n%s\nresult=\n%s\n' "$reference" "$result"
+    rv=1
+fi
+
+exit $rv