Fix number of tests

Author: Eugen Konkov

t/30sqlt-new-diff-pgsql.t

@@ -13,7 +13,7 @@ use Test::SQL::Translator qw(maybe_plan);
 use SQL::Translator::Schema::Constants;
 use Storable 'dclone';
 
-plan tests => 4;
+plan tests => 10;
 
 my @warns;
 local $SIG{__WARN__} = sub {