tests: consistently check for xapian-compact

We may need to test against development versions of Xapian,
which may rely on setting `XAPIAN_COMPACT=xapian-compact-1.5'.
Ensure it's possible to do that.

And add a missing check in t/xcpdb-reshard.t, too.

1 files changed, 1 insertions, 1 deletions

diff --git a/t/xcpdb-reshard.t b/t/xcpdb-reshard.t
index c1af5d9a..ede736c1 100644
--- a/t/xcpdb-reshard.t
+++ b/t/xcpdb-reshard.t
@@ -45,7 +45,7 @@ my %nums = map {; "$_->{num}" => 1 } @$orig;
 for my $R (qw(2 4 1 3 3)) {
         delete $ibx->{search}; # release old handles
         my $cmd = [@xcpdb, "-R$R", $ibx->{inboxdir}];
-        push @$cmd, '--compact' if $R == 1;
+        push @$cmd, '--compact' if $R == 1 && have_xapian_compact;
         ok(run_script($cmd), "xcpdb -R$R");
         my @new_shards = grep(m!/\d+\z!, glob("$ibx->{inboxdir}/xap*/*"));
         is(scalar(@new_shards), $R, 'resharded to two shards');