add a test with multiple pubkeys

tests/test.sh

@@ -0,0 +1,33 @@
+cleanup() {
+    rm -rf "$tempfile"
+}
+
+trap cleanup EXIT
+
+
+tempfile=$(tempfile)
+plaintext=$(cat sometext)
+
+echo -n 'testing multiple pubkeys: '
+../sshenc.sh -p id_rsa-1.pub -p id_rsa-2.pub -p id_rsa-3.pub < sometext > $tempfile
+cyph=$(../sshenc.sh -s id_rsa-1 < $tempfile)
+if [ "$cyph" == "$plaintext" ]; then
+    echo -n "key1: ✓ "
+else
+    echo -n "key1: ⛝ "
+fi
+cyph=$(../sshenc.sh -s id_rsa-2 < $tempfile)
+if [ "$cyph" == "$plaintext" ]; then
+    echo -n "key2: ✓ "
+else
+    echo -n "key2: ⛝ "
+fi
+cyph=$(../sshenc.sh -s id_rsa-3 < $tempfile)
+if [ "$cyph" == "$plaintext" ]; then
+    echo -n "key3: ✓ "
+else
+    echo -n "key4: ⛝ "
+fi
+
+echo
+echo done.