Test Create Sales Order

gistfile1.java

class TestCreateSalesOrder {
    private static testmethod void testCreateSalesOrder(){
        Contact c = new Contact(LastName='Test');
        insert c;

        biz3__Order__c order = new biz3__Order__c( Name='Test', biz3__Contact__c = c.Id );
        insert order;

        biz3__Sales_Order__c[] sales = [SELECT Id FROM biz3__Sales_Order__c WHERE biz3__Order__c = :order.Id];
        System.assertEquals( 1, sales.size() );
    }
}