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diff --git a/FS/t/suite/11-prorate_sync_single_pkg.t b/FS/t/suite/11-prorate_sync_single_pkg.t
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+++ b/FS/t/suite/11-prorate_sync_single_pkg.t
@@ -0,0 +1,89 @@
+#!/usr/bin/perl
+
+=head2 DESCRIPTION
+
+Tests the effect of ordering a sync_bill_date package either before or
+after noon and billing it for two consecutive cycles, in all three prorate
+rounding modes (round nearest, round up, and round down). Ref RT#34622.
+
+Correct: It should be charged full price in both cycles regardless of
+the prorate rounding mode, as long as prorate rounding is enabled.
+
+=cut
+
+use strict;
+use Test::More tests => 18;
+use FS::Test;
+use Date::Parse 'str2time';
+use Date::Format 'time2str';
+use Test::MockTime qw(set_fixed_time);
+use FS::cust_main;
+use FS::cust_pkg;
+use FS::Conf;
+my $FS= FS::Test->new;
+
+foreach my $prorate_mode (1, 2, 3) {
+  diag("prorate_round_day = $prorate_mode");
+  # Create a package def with the sync_bill_date option.
+  my $error;
+  my $old_part_pkg = $FS->qsearchs('part_pkg', { pkgpart => 5 });
+  my $part_pkg = $old_part_pkg->clone;
+  BAIL_OUT("existing pkgpart 5 is not a flat monthly package")
+    unless $part_pkg->freq eq '1' and $part_pkg->plan eq 'flat';
+  $error = $part_pkg->insert(
+    options => {  $old_part_pkg->options,
+                  'sync_bill_date' => 1,
+                  'prorate_round_day' => $prorate_mode, }
+  );
+
+  BAIL_OUT("can't configure package: $error") if $error;
+
+  my $pkgpart = $part_pkg->pkgpart;
+  # Create a clean customer with no other packages.
+  foreach my $hour (0, 8, 16) {
+    diag("$hour:00");
+    my $location = FS::cust_location->new({
+        address1  => '123 Example Street',
+        city      => 'Sacramento',
+        state     => 'CA',
+        country   => 'US',
+        zip       => '94901',
+    });
+    my $cust = FS::cust_main->new({
+        agentnum      => 1,
+        refnum        => 1,
+        last          => 'Customer',
+        first         => 'Sync bill date',
+        invoice_email => 'newcustomer@fake.freeside.biz',
+        payby         => 'BILL',
+        bill_location => $location,
+        ship_location => $location,
+    });
+    $error = $cust->insert;
+    BAIL_OUT("can't create test customer: $error") if $error;
+
+    my $pkg;
+    # Create and bill the package.
+    set_fixed_time(str2time("2016-03-10 $hour:00"));
+    $pkg = FS::cust_pkg->new({ pkgpart => $pkgpart });
+    $error = $cust->order_pkg({ 'cust_pkg' => $pkg });
+    BAIL_OUT("can't order package: $error") if $error;
+    $error = $cust->bill_and_collect;
+    BAIL_OUT("can't bill package: $error") if $error;
+
+    # Bill it a second time.
+    $pkg = $pkg->replace_old;
+    set_fixed_time($pkg->bill);
+    $error = $cust->bill_and_collect;
+    BAIL_OUT("can't bill package: $error") if $error;
+
+    # Check the amount billed.
+    my $recur = $part_pkg->base_recur;
+    my @cust_bill = $cust->cust_bill;
+    ok( $cust_bill[0]->charged == $recur, "first bill is $recur" )
+      or diag("first bill is ".$cust_bill[0]->charged);
+    ok( $cust_bill[1]->charged == $recur, "second bill is $recur" )
+      or diag("second bill is ".$cust_bill[1]->charged);
+
+  }
+}