--- /dev/null
+#!/usr/local/bin/perl -w
+
+use strict ;
+use Test ;
+use Text::Diff ;
+
+sub t($$$$) {
+ my ( $a, $b, $exp_a, $exp_b ) = @_;
+ my $d = diff \$a, \$b, { STYLE => "Table" };
+ my $re = qr/^\*.*\|\Q$exp_a\E\s*\|\Q$exp_b\E\s*\*$/m;
+
+ ## Older Test.pms don't support ok( $foo, qr// );
+ $d =~ $re
+ ? ok 1
+ : ok "\n" . $d, "a match for " . $re;
+}
+
+sub slurp { open SLURP, "<" . shift or die $! ; return join "", <SLURP> }
+
+my @tests = (
+sub { t " ", "\t", "\\s", "\\t" },
+sub { t " a", "\ta", " a", "\\ta" },
+sub { t "a ", "a\t", "a\\s", "a\\t" },
+sub { t "\t", "\\t", "\\t", "\\\\t" },
+sub { t "\ta", "\tb", " a", " b" },
+sub { t "-\ta", "-\tb", "- a", "- b" },
+sub { t "\\ta", "\\tb", "\\ta", "\\tb" },
+) ;
+
+plan tests => scalar @tests ;
+
+$_->() for @tests ;