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  local $ENV{DBIO_TRACE} = "=$lfn";
  unlink $lfn;

  $schema->resultset('CD')->count;

  my $schema2 = DBIO::SQLite::Test->init_schema(no_deploy => 1);
  $schema2->storage->_do_query('SELECT 1'); # _do_query() logs via standard mechanisms

  my @loglines = split /\n/, slurp_file($lfn);
  is(@loglines, 2, '2 lines of log');
  like($loglines[0], qr/^SELECT COUNT/, 'Env log from schema1 success');
  like($loglines[1], qr/^SELECT 1:/, 'Env log from schema2 success');

  $schema->storage->debugobj->debugfh(undef)
}

END {
  unlink $lfn if $lfn;
}

open(STDERRCOPY, '>&STDERR');

my $exception_line_number;
# STDERR will be closed, no T::B diag in blocks
my $exception = try {
  close(STDERR);
  $exception_line_number = __LINE__ + 1;  # important for test, do not reformat
  $schema->resultset('CD')->search({})->count;
} catch {
  $_
} finally {
  # restore STDERR
  open(STDERR, '>&STDERRCOPY');
};

ok $exception =~ /
  \QDuplication of STDERR for debug output failed (perhaps your STDERR is closed?)\E
    .+
  \Qat @{[__FILE__]} line $exception_line_number\E$
/xms
  or diag "Unexpected exception text:\n\n$exception\n";

my @warnings;
$exception = try {
  local $SIG{__WARN__} = sub { push @warnings, @_ if $_[0] =~ /character/i };
  close STDERR;
  open(STDERR, '>', File::Spec->devnull) or die $!;
  $schema->resultset('CD')->search({ title => "\x{1f4a9}" })->count;
  '';
} catch {
  $_;
} finally {
  # restore STDERR
  close STDERR;
  open(STDERR, '>&STDERRCOPY');
};

die "How did that fail... $exception"
  if $exception;

is_deeply(\@warnings, [], 'No warnings with unicode on STDERR');

# test debugcb and debugobj protocol
{
  my $rs = $schema->resultset('CD')->search( {
    artist => 1,
    cdid => { -between => [ 1, 3 ] },
    title => { '!=' => \[ '?', undef ] }
  });

  my $sql_trace = 'SELECT "me"."cdid", "me"."artist", "me"."title", "me"."year", "me"."genreid", "me"."single_track" FROM cd "me" WHERE ( "artist" = ? AND ( "cdid" BETWEEN ? AND ? ) AND "title" != ? )';
  my @bind_trace = qw( '1' '1' '3' NULL );  # quotes are in fact part of the trace </facepalm>


  my @args;
  $schema->storage->debugcb(sub { push @args, @_ } );

  $rs->all;

  is_deeply( \@args, [
    "SELECT",
    sprintf( "%s: %s\n", $sql_trace, join ', ', @bind_trace ),
  ]);

  {
    package DBIO::Test::DebugObj;
    our @ISA = 'DBIO::Storage::Statistics';

    sub query_start {
      my $self = shift;
      ( $self->{_traced_sql}, @{$self->{_traced_bind}} ) = @_;
    }
  }

  my $do = $schema->storage->debugobj(DBIO::Test::DebugObj->new);

  $rs->all;

  is( $do->{_traced_sql}, $sql_trace );

  is_deeply ( $do->{_traced_bind}, \@bind_trace );
}

# recreate test as seen in DBIO::QueryLog
# the rationale is that if someone uses a non-IO::Handle object
# on CPAN, many are *bound* to use one on darkpan. Thus this
# test to ensure there is no future silent breakage
{
  my $output = "";

  {
    package DBIO::Test::_Printable;

    sub print {
      my ($self, @args) = @_;
      $output .= join('', @args);
    }
  }

  $schema->storage->debugobj(undef);
  $schema->storage->debug(1);