Adding __PACKAGE__->table('CustomTest'); seemed to help. 
package TA::CP::DB::Schema::Result::CustomTest;

use strict;
use warnings;
use base qw/DBIx::Class::Core/;

__PACKAGE__->table_class('DBIx::Class::ResultSource::View');

__PACKAGE__->table('CustomTest');
__PACKAGE__->result_source_instance->is_virtual(1);

__PACKAGE__->result_source_instance->view_definition(\"select 2*2");

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In reply to Re: DBIx::Class problem by Khen1950fx
in thread DBIx::Class problem by morgon

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