t/v1reindex.t | 10 ++++++++++
 t/v2reindex.t |  7 +++++++

diff --git a/t/v1reindex.t b/t/v1reindex.t
index 876c9db3441aee0f341ce28ec5554ab5414aed8a..8be95149723c1539ef252c72147b6da739e4e287 100644
--- a/t/v1reindex.t
+++ b/t/v1reindex.t
@@ -63,6 +63,7 @@
 	$minmax = [ $ibx->mm->minmax ];
 	ok(defined $minmax->[0] && defined $minmax->[1], 'minmax defined');
 	is_deeply($minmax, [ 1, 10 ], 'minmax as expected');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = @$minmax;
 	$msgmap = $ibx->mm->msg_range(\$min, $max);
@@ -86,6 +87,8 @@ 	my $rw = PublicInbox::SearchIdx->new($ibx, 1);
 	eval { $rw->index_sync({reindex => 1}) };
 	is($@, '', 'no error from reindexing');
 	$im->done;
+
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -107,6 +110,7 @@ 	ok(-d $xap, 'Xapian directories recreated');
 
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -129,6 +133,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -151,6 +156,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = @$minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -174,6 +180,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 	my $mset = $ibx->search->query('hello world', {mset=>1});
 	isnt($mset->size, 0, 'got Xapian search results');
 
@@ -199,6 +206,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 	my $mset = $ibx->search->reopen->query('hello world', {mset=>1});
 	is($mset->size, 0, "no Xapian search results");
 
@@ -222,6 +230,8 @@ 	is($@, '', 'no error from indexing');
 	is_deeply(\@warn, [], 'no warnings');
 	my $mset = $ibx->search->reopen->query('hello world', {mset=>1});
 	isnt($mset->size, 0, 'search OK after basic -> medium');
+
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
diff --git a/t/v2reindex.t b/t/v2reindex.t
index 3d217aff3c72067f8d57f3c87d7a569efd0a82b1..a5454a22abf58dd929adff066e9099df775735c4 100644
--- a/t/v2reindex.t
+++ b/t/v2reindex.t
@@ -60,6 +60,7 @@ 	$im->done;
 	$minmax = [ $ibx->mm->minmax ];
 	ok(defined $minmax->[0] && defined $minmax->[1], 'minmax defined');
 	is_deeply($minmax, [ 1, 10 ], 'minmax as expected');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = @$minmax;
 	$msgmap = $ibx->mm->msg_range(\$min, $max);
@@ -85,6 +86,7 @@ 	$im->done;
 
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -104,6 +106,7 @@ 	ok(-d $xap, 'Xapian directories recreated');
 
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -125,6 +128,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	my ($min, $max) = $ibx->mm->minmax;
 	is_deeply($ibx->mm->msg_range(\$min, $max), $msgmap, 'msgmap unchanged');
@@ -147,6 +151,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 	my $mset = $ibx->search->query('"hello world"', {mset=>1});
 	isnt($mset->size, 0, "phrase search succeeds on indexlevel=full");
 	for (<"$xap/*/*">) { $sizes{$ibx->{indexlevel}} += -s _ if -f $_ }
@@ -172,6 +177,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 
 	if (0) {
 		# not sure why, but Xapian seems to fallback to terms and
@@ -208,6 +214,7 @@ 	$im->done;
 	ok(-d $xap, 'Xapian directories recreated');
 	delete $ibx->{mm};
 	is_deeply([ $ibx->mm->minmax ], $minmax, 'minmax unchanged');
+	is($ibx->mm->num_highwater, 10, 'num_highwater as expected');
 	my $mset = $ibx->search->query('hello', {mset=>1});
 	is($mset->size, 0, "search fails on indexlevel='basic'");
 	for (<"$xap/*/*">) { $sizes{$ibx->{indexlevel}} += -s _ if -f $_ }