1. A method in a host organization, wherein the method comprises: hosting a plurality of customer codebases within the host organization, each of the plurality of customer codebases having a plurality of operational statements and one or more test methods, the plurality of customer codebases belonging to customer organizations and executable under the direction and control of the customer organizations; the host organization performing regression testing by: (i) the host organization executing the one or more test methods belonging to the customer organizations against a production release codebase of the host organization to generate a first test result set; (ii) the host organization again executing the one or more test methods belonging to the customer organizations against a pre-release codebase of the host organization to generate a second test result; and (iii) the host organization identifying errors associated with the pre-release codebase based on a comparison of the first test result set and the second test result set.