test(usage): cover FPC rflash syntax

xCAT-test/unit/rflash_usage.t

@@ -0,0 +1,34 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use FindBin;
+use lib "$FindBin::Bin/../../perl-xCAT";
+use Test::More;
+
+BEGIN {
+    package xCAT::Utils;
+    sub Version { return 'test'; }
+}
+
+{
+    local $INC{'xCAT/Utils.pm'} = __FILE__;
+    require xCAT::Usage;
+}
+
+my $usage = xCAT::Usage->parseCommand( 'rflash', '--help' );
+
+like( $usage, qr/\QNeXtScale FPC specific:\E/x,
+    'rflash help identifies the NeXtScale FPC form' );
+like(
+    $usage,
+    qr{\Qrflash <noderange> http://<server>/path/to/update.rom\E}x,
+    'rflash help gives the complete FPC firmware URL syntax'
+);
+
+like( $usage, qr/\QPPC (using Direct FSP Management) specific:\E/x,
+    'rflash help retains the Direct FSP form' );
+like( $usage, qr/\QOpenPOWER BMC specific (using IPMI):\E/x,
+    'rflash help retains the OpenPOWER IPMI form' );
+
+done_testing();