diff --git a/xCAT-test/unit/debian_install_arch.t b/xCAT-test/unit/debian_install_arch.t
new file mode 100644
index 000000000..481718290
--- /dev/null
+++ b/xCAT-test/unit/debian_install_arch.t
@@ -0,0 +1,53 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use File::Path qw(make_path);
+use File::Temp qw(tempdir);
+use FindBin;
+use Test::More;
+
+# mkinstall logged "Unknown arch" for every architecture other than x86_64, x86, ppc64le and
+# ppc64el, so each diskful riscv64 install produced a false message. install_darch names the
+# architectures xCAT installs Ubuntu on and the Debian name each one maps to.
+
+# xCAT modules put $::XCATROOT/lib/perl ahead of @INC as they compile, so on a host with xCAT
+# installed the modules loaded after the first one would come from /opt/xcat. XCATROOT points
+# at this checkout before any of them compiles.
+BEGIN {
+    my $root = tempdir( CLEANUP => 1 );
+    make_path("$root/lib");
+    symlink( "$FindBin::Bin/../../perl-xCAT", "$root/lib/perl" ) or die "symlink: $!";
+    $ENV{XCATROOT} = $root;
+}
+
+BEGIN {
+    package xCAT::TableUtils;
+    our $tftpdir;
+    sub getTftpDir { return $tftpdir; }
+    $INC{'xCAT/TableUtils.pm'} = __FILE__;
+}
+
+use lib "$FindBin::Bin/../../perl-xCAT";
+use lib "$FindBin::Bin/../../xCAT-server/lib/perl";
+my $plugin = "$FindBin::Bin/../../xCAT-server/lib/xcat/plugins/debian.pm";
+require $plugin;
+
+my @cases = (
+    # arch       Debian name  installs Ubuntu
+    [ 'x86_64',  'amd64',     1 ],
+    [ 'x86',     'i386',      1 ],
+    [ 'ppc64le', 'ppc64le',   1 ],
+    [ 'ppc64el', 'ppc64el',   1 ],
+    [ 'riscv64', 'riscv64',   1 ],
+    [ 'aarch64', 'aarch64',   0 ],
+    [ 'sparc',   'sparc',     0 ],
+);
+foreach my $case (@cases) {
+    my ( $arch, $darch, $known ) = @$case;
+    my ( $got_darch, $got_known ) = xCAT_plugin::debian::install_darch($arch);
+    is( $got_darch, $darch, "$arch installs from the $darch tree" );
+    is( $got_known, $known, $known ? "... and is an architecture xCAT installs Ubuntu on" : "... and is reported as unknown" );
+}
+
+done_testing();